Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

I have a 2002 Chevy Trailblazer with the automatic 4wd ...

Customer Question
I have a 2002 Chevy...
I have a 2002 Chevy Trailblazer with the automatic 4wd transfer switch on the dash. I noticed that the light on the transfer switch above the 2WD setting is constantly blinking and it looks like a Red "N" is illuminated to he right of 4Lo. When I switched to A4WDH, the light continued to blink on top of that setting. I parked the car for 20 minutes and started it again and the light was NOT blinking and the red "N" disappeared. Do you know what causes this blinking? What is the letter "N" appearing for? Jeff
Submitted: 9 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 1 hour by:
3/13/2008
Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,432
Experience: Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
Verified
Hello, the red {n} light is a indicator for a neutral position for the transfer case. the key here, is the 2wd light flashing, that indicates a problem with the transfer case system. the transfer case needs to be scanned for any trouble codes. i suspect one of two things, one is a switch problem. the transfer case switch do fail on these trucks. the other, there are several software updates for the transfer case control module. normally the software updates have to be programmed at the dealer with a class two scan tool!!!
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,432
Experience: Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
Verified
goodwrench9124 and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 9 years ago
Reply to goodwrench9124's Post: Does the red "N" light that indicates neutral mean that when I switch from 2WD to 4WD, it's not doing anything?
Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago

normally if the transfer case was in neutral, this light would be on. then the truck would not move. i am pretty sure you will find the switch is causing you the problem. normally this problem will set a b2725 code in the transfer case module.

Transfer Case Shift Control Switch


Object Number:(NNN) NNN-NNNN Size: SH

The NVG 226 transfer case features a rotary 4 mode shift control switch located on the instrument panel. When the ignition key is in the RUN position, the transfer case shift control module monitors the transfer case shift control switch to determine if the driver desires a new mode/range position. At a single turn of the transfer case shift control switch, the lamp of the new desired position will begin flashing to inform the driver that the transfer case shift control module has received the request for a new mode/range position. The lamp will continue to flash until all shifting criteria has been met and the new mode/range position has been reached, or has been engaged. Once the new mode/range position is fully active, the switch indicator lamp for the new position will remain ON constantly. During normal driving situations, the transfer case can operate in the Auto 4WD mode. In the Auto 4WD mode, the transfer case shift control module monitors rear wheel slip speed, based on the inputs from both the front and rear propshaft speed sensors. When the vehicle experiences a rear wheel slip condition, the transfer case shift control module sends a pulse width modulated (PWM) signal to an electronic motor, which is the transfer case encoder motor. This motor rotates the transfer case control actuator lever shaft, applying a clutch pack. This clutch pack is designed to deliver a variable amount of torque, normally delivered to the rear wheels, and transfers it to the front wheels. Torque is ramped up to the front wheels until the front propshaft speed sensor matches that of the rear propshaft speed sensor. Torque is ramped down to the front wheels. The process would repeat if rear wheel slip is detected again. The NVG 226 transfer case has the added feature of also providing the driver with 3 manual mode/range positions:

4HI
4-Wheel Drive high range
2HI
2-Wheel Drive high range
4LO
4-Wheel Drive low range

The driver may choose to select any of these mode/range positions while driving the vehicle. However, the transfer case will not allow a shift into or out of 4LO unless the following criteria has been met:

The engine is funning.
The automatic transmission is in Neutral.
The vehicle speed is less than 5 km/h (3 mph).

This transfer case also has a Neutral position. A shift to the Neutral position allows the vehicle to be towed without rotating the transmission output shaft. Neutral position may be obtained only if the following criteria has been met:

The engine is running.
The automatic transmission is in Neutral.
The vehicle speed is less than 5 km/h (3 mph).
The transfer case is in 2HI mode.

Once these conditions have been met, turn the rotary switch clockwise past the last and hold for 10 seconds. When the system completes the shift to neutral, the red neutral lamp will illuminate.

Ask Your Own Chevy Question
Customer reply replied 9 years ago
Reply to goodwrench9124's Post: Ok. Thanks for your response. I'll get the switch replace this week.
Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago
let us know how things turn out!!
Ask Your Own Chevy Question
Customer reply replied 9 years ago
I will. Thanks
Chevy Mechanic: goodwrench9124, ASE Certified Technician replied 9 years ago
Lets us know how things turn out!! and Thanks for using JA!!!
Ask Your Own Chevy Question
Ask goodwrench9124 Your Own Question
goodwrench9124
goodwrench9124
goodwrench9124, ASE Certified Technician
Category: Chevy
Satisfied Customers: 3,432
3,432 Satisfied Customers
Experience: Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified

goodwrench9124 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 having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

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

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,249 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,196 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,847 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,900 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,682 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
When I start the engine, the power steering automatically
when I start the engine, the power steering automatically forces the wheels all the way to the left. They are then locked there and I can't move them. … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,900 satisfied customers
Check engine light is on... It spudders at an idel. And
Check engine light is on... It spudders at an idel. And sometimes doesnt start .. … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
No power to fuel injectors when engine cranks. Fuel
no power to fuel injectors when engine cranks. Fuel injectors are brand new. rtruck runs when gas is poured into carborater. 1989 gmc suburban 350 motor … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,196 satisfied customers
The engine and traction control lights are on, and there is
The engine and traction control lights are on, and there is a "service traction" message on my 2011 Malibu. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
2002 Chevy Blazer with 4.3 engine. Frequently will not start
2002 Chevy Blazer with 4.3 engine. Frequently will not start after setting overnight. Dribble a little gas in the intake and it fires up and runs fine. May or may not start after sitting a few hours. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Engine is so hot burns plug wires Engine gets so hot outside
engine is so hot burns plug wires Engine gets so hot outside until it burns plug wires … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,938 satisfied customers
86 K10 temp. gauge goes to hot and engine dies, but engine
86 K10 temp. gauge goes to hot and engine dies, but engine is still cool … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
1996 chevy Silverado k2500 5.7 vortec engine engine light on
1996 chevy Silverado k2500 5.7 vortec engine engine light on po300 random misfire detected we replaced plugs wires Distributor cap and rotor pickup coil checked compression everything is good there ch… read more
Michael Solis
Michael Solis
259 satisfied customers
It will not start the engine will turn fine but will not
It will not start the engine will turn fine but will not start i replaced the fuel pump but it made no difference i also tried changing the fuel pump relay but that did nothing … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Wash engine but do not start engine. Its ok. Everything is
wash engine but do not start engine JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: Yes its ok JA: What is the model/year of your Chevy? Customer:… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
I got a crate engine 10066038 in back of the engine i says
i got a crate engine 10066038 in back of the engine i says im0918 6vp can you tell me more about this engine? … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My car won't start it says engine power reduced, engine
Hello my car won't start it says engine power reduced, engine disabled, and service esc … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Have a 2009 HHR, 2.4 L engine. Check engine light came on,
Have a 2009 HHR, 2.4 L engine. Check engine light came on, had scanned at AutoZone. Code P0010, with definition: intake camshaft position actuator solenoid, control circuit bank 1. Explanation:ECM has… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
Check engine light, reduced engine power, service power
check engine light, reduced engine power, service power steering mesaages … read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Now I have a P0300 check engine light code. Swapped out coil packs. Drive down the road perfectly. What do I do next?… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Enabled the crankshaft position variation learn procedure. Ran for 20 to 25 minutes. Won't start. Has spark and fuel pump is running. No inj… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
My 2006 sierra 3500 8.1 litre engine all of a sudden engine
My 2006 sierra 3500 8.1 litre engine all of a sudden engine light came on and would not go over 20 mph. Then turn off and run good till it warms up … read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines.
2005 Chevrolet Aveo. 1.6 liter engine. Swapped out engines. Enabled the crankshaft position variation learn procedure. Ran for 20 to 25 minutes. Won't start. Has spark and fuel pump is running. No inj… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 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