Dodge

Dodge Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Dodge

My diesel 6.7 truck cycles off and on when it warms up

Customer Question
almost as if the power...
my diesel 6.7 truck cycles off and on when it warms up almost as if the power was flickering off and on
Submitted: 1 year ago.Category: Dodge
Show More
Show Less
Ask Your Own Dodge Question
Answered in 20 hours by:
9/30/2016
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago
Robert R
Robert R, ASE Certified Master
Category: Dodge
Satisfied Customers: 4,598
Experience: Dodge Master Certified, Dodge Sprinter Certified
Verified

Hello, welcome and thanks for asking your question. My name is*****'m a Certified Auto Technician with 29+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.

Is this an idle fluctuation up and down?

Ask Your Own Dodge Question
Customer reply replied 1 year ago
No it happens on idle to some extent but it stalls Un less I throthe it than it cycles a lot more
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

You said it had a code for turbo speed sensor. What was the actual "P Code" that is being set?

From your explanation, it sounds like you may have a stuck turbocharger or a plugged DPF.

What do you do to get the problem to go away? Does it go away after the engine has warmed up?

Ask Your Own Dodge Question
Customer reply replied 1 year ago
2579 is the code I got which indicated that the turbo speed sensor is acting up I replaced it to no avail also checked old sensor it checked out ok. the input voltage of about 2.5v going to sensor have not found out if this is ok maybe you can enlighten me on this. the problem becomes apparent when the motor warms up.
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

Ok, there are a couple other possibilities for the P2579 other than the Turbo Speed sensor. I'm posting the diagnostic procedures for this code. if you need additional info don't hesitate to ask..

P2579 Diagnostic procedure --->> Click Here to view <<---

Run the diagnostic procedure and post back the results..

Thank you,

Robert

Ask Your Own Dodge Question
Customer reply replied 1 year ago
would this possibly cause the engine to cycle?
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

The most common causes for engine to be cycling is a plugged DPF (Exhaust Filter) or a Stuck Turbocharger Sliding Nozzle. Usually you would have other codes such as p1451 and p242f and also p2262 or p2563.

At this time I recommend to diagnose for the code that is coming up and get this code to stay cleared and it should solve your problem...

Keep me posted and let me know if you have any additional questions...

Thank you,

Robert

Ask Your Own Dodge Question
Customer reply replied 1 year ago
no those codes did not come up only 2579 and 2580
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

A sticking sliding nozzle in the turbo could cause these codes depending on what position the nozzle is sticking at. When it sticks closed, it usually limits engine rpm as the engine is having a hard time expelling the exhaust gasses. This causes the idle cycling or fluctuation and limited max rpm and possible smoke depending on the condition of the DPF. Most likely you will end up needing to replace the complete turbocharger assembly...

Keep me posted and let me know if you have any additional questions...

Thank you,

Robert

Ask Your Own Dodge Question
Customer reply replied 1 year ago
just checking 1 more time what is the voltage going to the speed sensor I presently have 2.44 volts is that correct? I have been told it should be 5v have not been able to confirm.
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

The Turbo Speed Sensor generates it's own signal --->> Click Here to view <<--- Because of this, there probably should not be any voltage present on the Turbo Speed Sensor wires. There is no published info as to if there should be voltage present. See the diagnostic procedure I posted above for the Proper testing procedure. It never has you checking voltage it just has you testing the sensor itself and checking the wires, If all that is ok then the ECM is assumed faulty and will need to be replaced....

Keep me posted and let me know if you have any additional questions...

Thank you,

Robert

Ask Your Own Dodge Question
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

Best thing to do would be to disconnect the sensor and the ECM C1 connector and check if voltage is still present, If there is, Further testing will be required to see where the short to voltage is at. Otherwise, test the wires per the test procedure above and you should be able to easily narrow down the culprit....

Keep me posted...

Thank you,

Robert

Ask Your Own Dodge Question
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

Another possibility per the possibilities section in the flowchart is the Boost Pressure Sensor (AKA MAP Sensor). Unfortunately, the diagnostic procedure never leads to this sensor as a result so you may find that just replacing the Boost Pressure Sensor may fix this issue...

Keep me posted and let me know if you have any additional questions...

Thank you,

Robert

Ask Your Own Dodge Question
Dodge Mechanic: Robert R, ASE Certified Master replied 1 year ago

Here is the P2580 Chart, it may help for diagnostic purposes..

--->> Click Here to view <<---

I found a star case for this code also

--->> Click Here to view <<---

Thank you,

Robert

______________________________________

Please keep in mind, If I haven't clearly answered your question and you need additional info, please don't hesitate to ask "before" you Rate my Answer.

Remember, RATING is REQUIRED to credit me for helping you!

A "One Star" or "Two Star" rating does not automatically result in a refund so if you would rather have a refund, please reply and let me know BEFORE rating and I will submit a refund request with Customer Service on your behalf...

This site operates on the honor system, meaning I only get paid with a "3 Star" rating or better. Once you are satisfied with my service, please "Rate". Remember, you have already paid to use the site, all the rating does is allow the expert to be paid for his time. Expert Payment comes out of the fee you paid to use the service. Thanks in advance for a "5 Star" Rating.

Ask Your Own Dodge Question
Ask Robert R Your Own Question
Robert R
Robert R
Robert R, ASE Certified Master
Category: Dodge
Satisfied Customers: 4,598
4,598 Satisfied Customers
Experience: Dodge Master Certified, Dodge Sprinter Certified

Robert R 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 AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP.

TOM WHITTAKERUSA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

Rev. Jerry BaysingerHolts Summit, Mo

I recently asked a question about my 2005 dodge ram, and I just wanted to let my Expert know that he hit the nail squarely on the head with his answer. I wanted to thank him again.

GregPittsburgh, PA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

JerryHolts Summit, MO

I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat.

StanSayre, PA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

< Previous | Next >

Meet the Experts:

Jerry

Jerry

Master Mechanic

1,754 satisfied customers

ASE Master tech, 30 years exp. troubleshooter, driveability tech

Chris

Chris

Shop Foreman

6,753 satisfied customers

Dodge/Cummins and Chrysler Certified Master Tech

Mopar Certified

Mopar Certified

Dodge Technician

5,939 satisfied customers

24 Year Chrysler/Dodge Certified Specialist

moparfl

moparfl

ASE Certified Technician

3,292 satisfied customers

ASE Master Tech Gold level Chrysler Status 30 years dealership exp

Dodgerench

Dodgerench

ASE Certified Technician

2,814 satisfied customers

30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist

Tim Mohr

Tim Mohr

ASE MASTER TECH

2,322 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Don - Mo Lurch

Don - Mo Lurch

Aftermarket & Factory Electronics

1,568 satisfied customers

Cert. Dodge & Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years

< Previous | Next >

Related Dodge Questions
When in gear, 2005 Neon SXT "stumbles" at idle and reads
when in gear, 2005 Neon SXT "stumbles" at idle and reads code P1684. Cause? … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,403 satisfied customers
I have a 06 Ram 4x4, replaced gaskets because transmission
I have a 06 Ram 4x4 , replaced gaskets because transmission was leaking and it was moving fine , now after tranny was put back in an all connected it wont move . Fluids are full , all connections are … read more
Chris
Chris
Shop Foreman
6,753 satisfied customers
2003 Dodge Caravan. No I took it to 2 mechanics and they say
No I took it to 2 mechanics and they say they can't fix whats working (windshield wipers radio and heater stop working intermittently) … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Here's my problem. I have a 2012 Dodge ram lonestar 1500 V8
OK here's my problem. I have a 2012 Dodge ram lonestar 1500 V8 5.7 L hemi with 157,000 miles, and I'm getting a cylinder 2 misfire. - Replaced spark plugs with dealer recommended plugs - Did a fuel in… read more
Brad
Brad
Technician at Dodge Dealership
Vocational, Technical or Trade Scho
12 satisfied customers
My 2005 dodge neon sxt will not go into gear. i just
my 2005 dodge neon sxt will not go into gear. i just replaced the motor mount number two right by the power stearing. car was just running fine and we also broke the transmission cooling line in which… read more
Dan
Dan
Dealership Technician
Associate Degree
1,773 satisfied customers
I have a 2002 dakota that i bought with no keys at all.so i
i have a 2002 dakota that i bought with no keys at all.so i changed the bcm and pcm from a non security truck i did get the truck to run,i locked the doors and when i opened it up the alarm went off a… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
I just replaced my brake stoplight switch so now my Truck
I just replaced my brake stoplight switch so now my Truck will not go into gear. Cant get it out of park … read more
Chris
Chris
Shop Foreman
6,753 satisfied customers
I have a ‘08 magnum 2.7L. It got too cold, and cracked the
I have a ‘08 magnum 2.7L. It got too cold, and cracked the right head. I replaced the head, and water pump. I now have water coming out of the oil pump hole that oils the timining chain. Do I have a c… read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,421 satisfied customers
1997 dodge stratus he needs help or advice on how to change
1997 dodge stratus he needs help or advice on how to change the oil pan he has been fighting it for 3 days now is there any way you can text him at 35 with advice … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
2011 dodge caliber is going into limp mode when i go on
2011 dodge caliber is going into limp mode when i go on highway. no dash warning lights. so i pull over and shut off for 20 min then start and it drives like new.i did replace cat converter and plugs … read more
Chris
Chris
Shop Foreman
6,753 satisfied customers
Just bought an 07 Ram 3500 6.7. Yesterday tried to set some
Just bought an 07 Ram 3500 6.7. Yesterday tried to set some of the personal settings in the EVIC to my liking, and upon opening the door the alarm went off and would not stop. I even started the truck… read more
Mopar Certified
Mopar Certified
Dodge Technician
Vocational, Technical or Trade Scho
5,939 satisfied customers
I have a 1999 dodge Dakota rt 5.9 I cant find where to plug
I have a 1999 dodge Dakota rt 5.9 I cant find where to plug the largevacuum hose in that comes off the charcoal canister under the truck … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
My remote stopped working and I can not manually use the key
My remote stopped working and I can not manually use the key to start the engine. I have a 2008 dodge ram 1500. … read more
Chris
Chris
Shop Foreman
6,753 satisfied customers
My 2016 Ram 2500 is give me a service 4wd message... My wife
my 2016 Ram 2500 is give me a service 4wd message... My wife drove home with it in 4wd L ...which concerned me.....but after checking it out...i"m not sure the 4wd ever engaged. it would have been ver… read more
Chris
Chris
Shop Foreman
6,753 satisfied customers
Only have heat out the vents if I hit the recirculating
Only have heat out the vents if I hit the recirculating button. Have a 2009 Ram 1500 Laramie with automatic temperature control... … read more
roy
roy
Associate Degree
3 satisfied customers
Warm air from heater only comes out of defrost vents and
warm air from heater only comes out of defrost vents and dash, can not get heat on floor board, where is blend door on 2003 Ram 2500?… read more
Chris
Chris
Shop Foreman
6,753 satisfied customers
My ram does not start from his nothing the battery is new
my ram does not start from his nothing the battery is new and all the fuse okk and my mannette no longer works bar and door opening … read more
Brad
Brad
Technician at Dodge Dealership
Vocational, Technical or Trade Scho
12 satisfied customers
I have a 2013 Dodge Grand Caravan where I replaced the
I have a 2013 Dodge Grand Caravan where I replaced the interior lights with LED's. I shorted terminals while replacing, now the interior lights will not work right. I have replaced the I.O.D fuse (it … read more
Eric
Eric
Retired
N/A
14,436 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