Nissan

Nissan repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

I'm looking for a technician with substantial work history…

Customer Question
Hello:I'm looking for a technician...
Hello:I'm looking for a technician with substantial work history in a Nissan service department. This involves a 2004 Sentra 1.8/s. Daughter had scary incident on expressway where speed declined to about 20 MPH and she was unable to accelerate past that. Was in center lane and cars zipped past not allowing her to pull over for quite a while. Long story short, after getting off shoulder, she shut car off, several minutes later restarted, and finished her journey with no repeat. MIL was lit, but this was due to an existing PO447 I have not yet addressed. When she got home I connected scanner - only DTC was existing PO447. I drove car - all fine. Later, she told me this had occurred once before but she forgot to tell me.Been reading up on fail safe mode. Is this what happened - did something trigger fail safe mode ? Sounds like other people have reported same / similar experience, but they have related DTC's. I realize there can be multiple possible causes. What are your top 3-5 suspects, and would you include the possibility of a fluky APP sensor ? thanks ...
Submitted: 10 months ago.Category: Nissan
Show More
Show Less
Ask Your Own Nissan Question
Answered in 6 hours by:
9/29/2017
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 21,824
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
Verified

Hello my name is ***** ***** thank you for your question.

On your year Sentra, this does sound like the vehicle went into limp mode.. Or Brake Over Ride..

Were you using a scanner or a code reader? Does she recall if the vehicle was running hot? Did she have her Ac on?

Ask Your Own Nissan Question
Customer reply replied 10 months ago
Hi Jay:
OBD2 Scan tool, but not high end. Not running hot, but I imagine she had A/C on as it was about 90 degree day.For my info, how long did you work in a Nissan service dept ?
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago
Sorry, I stepped away. At a Friday wedding.Does she recall looking at the temp gauge?I have been a Nissan tech since 1990
Ask Your Own Nissan Question
Customer reply replied 10 months ago
No problem. My days are very broken up thus the lags in my responses. When she had pulled over she called me briefly. I asked about temp gauge and she said "below mid point". And car has been driven past few days with no issues. I repeatedly tell my kids to watch temp gage / idiot lights and call me if they see anything.
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

Weekends I take the time to do things I need to get done. I am mainly online evenings during the week. Would that work for you?

Ask Your Own Nissan Question
Customer reply replied 10 months ago
Jay:Week nights are hit / miss, but please reply when you can and I'll do same. Car behaving currently - goal is to prevent a future re-occurrence if possible.
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

Have you replaced any cam sensors on the car recently? Any recent work done? I will try to reply during the day as I am working to accommodate you

Ask Your Own Nissan Question
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

The P0447 is for the Evap vent control valve. That will not cause this issue. So I will need to ask questions to see what work may have been done on the vehicle to see if I can isolate your issue.

Ask Your Own Nissan Question
Customer reply replied 10 months ago
Correct, PO447 should have no effect. Most recent repair was in June, replaced alternator due to bad bearing. Just FYI, I've done nearly all work on my 5 family vehicles and have for many years, including diagnosing and addressing DTC's. I only go "outside" if I'm not equipped for the repair, or I encounter a condition that has me perplexed. Then I reach out to try to find someone who has previously encountered the same condition and identified a solution.
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

ahhh., This is good info. Where was the Alternator purchased? Did this issue happen at night time? Do you have a volt meter?

Ask Your Own Nissan Question
Customer reply replied 10 months ago
No not at night time. Jay, regarding alternator, where are you heading with this ?
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

If you got the alternator after market, they are known not to work right. I have experienced this first hand for myself, and for customers.

What happens with after market alternators is that most cases they do not work right out of the box. If you do get one that works, they only tend to last about a year. The worst part about them is that they can also intermittently not charge, and then charge. So when they stop charging they could cause the vehicle to go into a limp mode when system voltage gets to low which may have been what happened. So if you have a volt meter, I have a quick and easy way to check the charging system. Also has this happened only that one time?

Ask Your Own Nissan Question
Customer reply replied 10 months ago
Jay: Has happened once before. Asked my daughter, and she says was 2-3 months ago. This would have been with original alternator which was fine other than bearing getting noisy. Current alternator is from my son's '05 Sentra while he's out of country for a few months. Is the original alternator. He says he never had a "limp mode incident". Alternator tests to spec and we have no dimming of lights etc. And not likely for alternator to "hiccup" especially 2 of them. So I'm not suspecting alternator. I'm leaning towards a hiccup elsewhere. As shown below, unfortunately there are many sensors / devices that can cause fail-safe mode. And when it happens rarely and intermittently with no codes, very tough to know what hiccuped. Of course could be a cracked wire in any of these systems ...So I was hoping perhaps you had encountered and cured this 1 or more times before as a Nissan tech. But I have a feeling I'll be searching for needle in a haystackTROUBLE DIAGNOSIS
Fail-safe Chart UBS00B36
 When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.
 When there is an open circuit on MIL circuit, the ECM can not warn the driver by lighting MIL up when there is malfunction on engine control system. Therefore, when Electrical controlled throttle and part of ECM related diagnoses is continuously detected as NG for 5-trips, ECM warns the driver that engine control system has malfunction and MIL circuit is open by means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the driver to repair the malfunction.
DTC No. Detected items Engine operating condition in fail-safe mode
P0102
P0103
P1102
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117
P0118
Engine coolant temperature
sensor circuit
Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON or START.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned ON or Start 40°C (104°F)
More than approx. 4 minutes after ignition ON or Start 80°C (176°F)
Except as shown above
40 - 80°C (104 - 176°F) (Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running.
P0122
P0123
P0222
P0223
P2135
Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition. So, the acceleration will be poor.
P1121 Electric throttle control actuator
(ECM detect the throttle
valve is stuck open.)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls. The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more.
P1122 Electric throttle control function
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1124
P1126
Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1128
Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P1129
Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition. So, the acceleration will be poor. Engine operating condition in fail-safe mode Engine speed will not rise more then 2,500 rpm due to the fuel cut.
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

I received a response with a ton of information, but it's not showing on here.

Ask Your Own Nissan Question
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

did you type this to me? cause it never made it to the question page...

"Jay: Has happened once before. Asked my daughter, and she says was 2-3 months ago. This would have been with original alternator which was fine other than bearing getting noisy. Current alternator is from my son's '05 Sentra while he's out of country for a few months. Is the original alternator. He says he never had a "limp mode incident". Alternator tests to spec and we have no dimming of lights etc. And not likely for alternator to "hiccup" especially 2 of them. So I'm not suspecting alternator. I'm leaning towards a hiccup elsewhere. As shown below, unfortunately there are many sensors / devices that can cause fail-safe mode. And when it happens rarely and intermittently with no codes, very tough to know what hiccuped. Of course could be a cracked wire in any of these systems ... So I was hoping perhaps you had encountered and cured this 1 or more times before as a Nissan tech. But I have a feeling I'll be searching for needle in a haystack TROUBLE DIAGNOSIS Fail-safe Chart UBS00B36 When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up. When there is an open circuit on MIL circuit, the ECM can not warn the driver by lighting MIL up when there is malfunction on engine control system. Therefore, when Electrical controlled throttle and part of ECM related diagnoses is continuously detected as NG for 5-trips, ECM warns the driver that engine control system has malfunction and MIL circuit is open by means of operating fail-safe function. The fail-safe function also operates when above diagnoses except MIL circuit are detected, and demands the driver to repair the malfunction. DTC No. Detected items Engine operating condition in fail-safe mode P0102 P0103 P1102 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut. P0117 P0118 Engine coolant temperature sensor circuit Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON or START. CONSULT-II displays the engine coolant temperature decided by ECM. Condition Engine coolant temperature decided (CONSULT-II display) Just as ignition switch is turned ON or Start 40°C (104°F) More than approx. 4 minutes after ignition ON or Start 80°C (176°F) Except as shown above 40 - 80°C (104 - 176°F) (Depends on the time) When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running. P0122 P0123 P0222 P0223 P2135 Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees.The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor. P1121 Electric throttle control actuator (ECM detect the throttle valve is stuck open.) While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls. The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or more. P1122 Electric throttle control function ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. P1124 P1126 Throttle control motor relay ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. P1128 Throttle control motor ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. P1129 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring. P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within +10 degrees. The ECM regulates the opening speed of the throttle valve to be slower than the normal condition. So, the acceleration will be poor. Engine operating condition in fail-safe mode Engine speed will not rise more then 2,500 rpm due to the fuel cut."

Ask Your Own Nissan Question
Nissan Mechanic: Jay, Nissan Technician replied 10 months ago

Cause with all this new information.. I have a bunch more thoughts...

Ask Your Own Nissan Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a nissan mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Tom Your Own Question
Tom
Tom
Tom, ASE Certified Technician
Category: Nissan
Satisfied Customers: 2,488
2,488 Satisfied Customers
Experience: Qualified to repair all makes and models.

Tom is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was in trouble with an electrical issue with my brand new Nissan. I frantically went online trying to find help and luckily I found your site. I reached a NISSAN tech named RIP. He was absolutely tremendous and helped me work through the issue. What a pro!

cjazLexington, KY

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

< Previous | Next >

Meet the Experts:

Chris(aka-Moose)

Chris(aka-Moose)

Nissan Technician

747 satisfied customers

16 years of experience

Tim Mohr

Tim Mohr

ASE MASTER TECH

602 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Marty

Marty

ASE Certified Technician

161 satisfied customers

ASE & Bosch master tech. 30 years experience.

Mike V.

Mike V.

Nissan Technician

9,482 satisfied customers

Nissan factory trained and Certified Subaru Technician.

Ron

Ron

ASE Certified Technician

589 satisfied customers

34 years of automotive Repair

Anthony

Anthony

ASE Certified Technician

332 satisfied customers

ASE Master Automobile Technician with over 18 years exp. in this field.

Richard

Richard

ASE Certified Technician

92 satisfied customers

Nissan Tech ASE certified technician

< Previous | Next >

Related Nissan Questions
2010 nissan sentra, 2.0. Got PO171 code. I bought new spark
yes, I bought new spark plugs and replaced them, replaced intake manifold gaskets, had to duct tape the hose between air filter and mass air flow sensor … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,582 satisfied customers
I have a 2010 Nissan Altima 2.5. I was driving and all of a
I have a 2010 Nissan Altima 2.5. I was driving and all of a sudden it died. The lights come on and dash system lights work but not door locks and it won't start. Used a code reader and that gave me tw… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,582 satisfied customers
Altima: , My niece has a 2005 Nissan Altima with a 2.5L
Hi, My niece has a 2005 Nissan Altima with a 2.5L 4 cylinder. She recently was getting the CEL light on. Codes registered were P0429 and P1273. After reading another answer you provided we removed the… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Sentra: 2003 sentra hesitates intermittently and check engine
2003 sentra hesitates intermittently and check engine light flashes of and on. in a while the light stays on and the engine runs smoothly. I start the engine again later and luck of the draw, it eithe… read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
Sentra: My "Service Engine Soon" light came on and I got it
My "Service Engine Soon" light came on and I got it read at Autozone and it came up with P0171: "Fuel System lean bank 1." The car seems to run fine and has not done anything out of the ordinary. My g… read more
tim37857
tim37857
Mechanic
High School or GED
71 satisfied customers
Nissan/Datsun Titan: pulling trailer on long gradual hill,
pulling trailer on long gradual hill, lost power, could only get 2000 rpm, transmission barely pulling enough to make next exit. no signs of overheating. let truck cool for several hours, drove 55 mil… read more
Jake
Jake
309 satisfied customers
Sentra: My wife has a 2005 Nissan Sentra which she inherited
My wife has a 2005 Nissan Sentra which she inherited from her Dad with 72,100 miles. The air only comes out of the defrost and the floor, nothing on the dash. It also doesn't get very warm and only if… read more
Jake
Jake
309 satisfied customers
altima: I have a 03 Altima SE 3.5 that I purchased from a coworker
I have a 03 Altima SE 3.5 that I purchased from a coworker and it had a problem going over 2500 rpm, but it would still get up to speed. (just slow accel). So here is what I know and what I've done si… read more
Jake
Jake
309 satisfied customers
2000 Nissan Sentra: start driving..feel any surges..highway..60 mph
I have a 2000 Nissan Sentra with an automatic transmission that upon initial start, does not appear to shift properly through the forward gears. When I shift into drive and I start driving, I do not f… read more
normanahoyt
normanahoyt
Owner/technician/manager
Bachelor's Degree
367 satisfied customers
Nissan: would undercoat these 2007 cars pretty good
Hi Ivan....some new things to discuss. Do you know if Nissan would undercoat these 2007 cars pretty good? We plan on driving it year round (I know...sorry but) just not in the middle of snow storms. A… read more
Ivan
Ivan
Automotive Instructor
Vocational, Technical or Trade Scho
3,337 satisfied customers
1998 Nissan Sentra: ive heard I need studded tires..front wheel drive
I have a 1998 Nissan Sentra, and I HATE winter driving. I've heard I need studded tires, but that I need to put them on all four wheels--my car is only front wheel drive--can I just buy two studded sn… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2002 Nissan Sentra: head gasket..leak..engine light came..mileage
Well the story now gets better - I took my 2002 Nissan Sentra to the dealer after the head gasket diagnosis - he asked me how much he had quoted me??? which is weird don't you think? anywho I told him… read more
Mike V.
Mike V.
Nissan Technician
Subaru and Nissan factory training.
9,482 satisfied customers
2004 Nissan Sentra: my check engine soon light is on..cheapest
I have a 2004 Nissan Sentra 2.5S and my check engine soon light is on. What do I and where can I go to get the cheapest repair or diagonostic testing. I live in the Laurel, Maryland area. I read my ma… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
2004 Nissan Quest SE: ODB..the dealerships here to be unreliable
Request assistance with 2004 Nissan Quest SE, 3.5L Request location of all ODB codes for my engine. I am a service member overseas and have found the dealerships here to be unreliable. Van will not ge… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
My daughter has a Nissan Sentra 2002 1.8 L automatic. When
My daughter has a Nissan Sentra 2002 1.8 L automatic. When driving it occaisionally seems to slip out of gear. Stopping the car , turning it off then on seems to fix it. It has happened two or three t… read more
Tom
Tom
ASE Certified Technician
Vocational, Technical or Trade School
2,488 satisfied customers
2004 nissan sentra: the cam sensor..cold weather..wiring..ecm
We have replaced the cam sensor on a 2004 nissan sentra but the code wont clear and the vehicle is hard to start in cold weather and upon initial startup-we have tested the wiring, the sensor and ecm-… read more
3pac2222
3pac2222
nissan master auto tech
Associate Degree
2 satisfied customers
88 Nissan Pathfinder 4x4: injector..circuit..vehicle was running fine
I have an 88 Nissan Pathfinder 4x4 XE with the 3.0 engine. I am getting an error code 51 (open injector circuit). the vehicle was running fine when i took it shopping, upon leaving the store the vehic… read more
Roy F.
Roy F.
Auto Repair Technician
Vocational, Technical or Trade Scho
114 satisfied customers
2003 nissan sentra: emission..check engine light comes..rev
My Daughter has a 2003 nissan sentra, GXE which has the california emission. This car will drive fine, then she parks it for a few days and when she starts it up and tries to drive away the check engi… read more
Rixster
Rixster
Sr. Technician/Retired Owner
High School or GED
249 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x