Question about 2003 GMC Envoy

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I have a 2003 gmc envoy 4wd I have codes co237, co236 my abs light is on what does this mean

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Codes indicate rear wheel speed sensor fault, this part of ABS system. A mechanic will need to inspect sensors.

Posted on Sep 11, 2010

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Posted on Jan 02, 2017

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The brake and abs light just came on in my 2003 GMC envoy 4x4 what would cause it and where to start looking


Fist pull the code from your onboard computer with a OB2 scanner, that will give you the best clue, then clean and check your wheel sensors especially on the front axle. Then have the abs module checked. Most likely it is the wheel sensors, If you have a lot of brake wear they could be dirty or miss gapped, I would start there

Jan 10, 2015 | 2003 GMC Envoy

1 Answer

Reset service indicator


When the 4WD Service light comes on it means that the Transfer Case Control Module (TCCM) has not received the proper feedback from the two actuators that control the 4WD engagement. The system needs to be diagnosed by a technician.

Apr 06, 2014 | 2003 GMC Envoy Xl

2 Answers

Co237 and co267 for 2003 chevy trail blazer


C0237 is related to the rear speed sensor and C0267 is related to the pump motor in the ABS system.

Feb 15, 2014 | 2003 Chevrolet TrailBlazer

1 Answer

Why would the abs, brake, and service 4wd lights all come on at the same time.


They are connected thru the body computer. IE, if you are in 4wd and a problem develops with the ABS the system will go into limp mode.
You will need to get the codes scanned to find out where to start.

Jun 25, 2012 | 2004 GMC Envoy

1 Answer

02 escalade fc co237


I am guess you mean P error codes.. There is no C error codes

P0237: Turbo/Super Boost Sensor A Circuit Low Input
P0268: Cylinder 3 Injector Control Circuit High
P0269: Cylinder 3 Contribution Balance Fault
P0287: Cylinder 9 Contribution Balance Fault
P0711: Trans Fluid Temp Sensor A CKT Range/Perf

Feb 06, 2012 | 2003 GMC Envoy

1 Answer

2002 envoy code co550


you need to replace the tccm and get it programmed.


2-04-21-006E: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set No Communication with TCCM (Reprogram Transfer Case Control Module) - (Jul 20, 2006)
999999995.gif Subject: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set, No Communication with TCCM (Reprogram Transfer Case Control Module) Models: 2004 Buick Rainier 2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2002-2004 GMC Envoy, Envoy XL 2003-2004 GMC Sierra, Yukon, Yukon XL 2004 GMC Envoy XUV 2002-2004 Oldsmobile Bravada with Electronic Shift or Active Transfer Case (RPOs NP1, NP4 or NP8)

This bulletin is being revised to add Subject information and change the labor operation. This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Please discard Corporate Bulletin Numbers 02-04-21-006D and 03-04-21-006 (Section 04 -- Driveline/Axle).
ConditionSome customers may comment that the 4WD/AWD indicator lights on the selector switch do not work, or the 4WD/AWD system may be inoperative and/or the service 4WD light is illuminated. The condition is typically intermittent and always occurs at key-up. Upon investigation, the technician may find DTC C0550 set.
CauseThe Transfer Case Control Module (TCCM) has not received the wake-up call during key-up and has remained in the "sleep mode".
When the TCCM is in the "sleep mode", it will not communicate with the class II bus or the Tech 2®.
Correction
  1. Try to communicate with the TCCM. If no communication, go to step 2. If communication is possible, go to step 5.
  2. Remove the underhood (ATCM or TREC) TCCM fuse.
  3. Wait 30 seconds.
  4. Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
  5. Check for codes in the TCCM. If a C0550 is found current or in history with or without other codes, replace the module and go to step 6.
  6. Reprogram the TCCM with the latest TIS software using normal SPS procedures.
  7. Verify operation and that no codes are present.
Important: For the 2002 model year, the TCCM must be replaced and reprogrammed.
Warranty Information

Jul 29, 2011 | 2002 GMC Envoy

1 Answer

03 GMC Envoy the abs light stays on. The pads and rotors all around are brand new.


Have your ABS Wheel Sensor checked, it is mounted on the hub of your axle. it could have gotten dirt on it or it is bad and it is not giving a signal to the ABS Module.

Jun 13, 2010 | 2003 GMC Envoy

2 Answers

2003 gmc envoy!!! Need help asap! For the last


Ask a garage to reset your computer, could be a recurring trip fault causing the car to shut down.

Clearing it might solve the problem - if not, the fault codes will tell you what the problem is!

Apr 30, 2010 | 2003 GMC Envoy

1 Answer

2005 GMC Envoy 4wd 4.2liter V6 check engine light is on.


The check valve is #12619128 and the gasket is #24577193. I think $65 and $75 respectively you can try websites like parts4chevy.com and gmpartsdirect.com. 
your talking about the diverter valve for the AIR pump. In which case it is easy to do and its easily accesible in the engine bay. The valve is located at the passenger side by the transmission dipstick tube under the intake tube. Good luck

Apr 08, 2009 | 2003 GMC Envoy Xl

1 Answer

2003 gmc envoy 4x4 not working


My 2005 Envoy 4WD is not working. Switc is currently on 2HI, but light is showing AWD. What is the problem???

Dec 20, 2008 | 2003 GMC Envoy

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