Question about 2007 GMC Yukon

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2007 GMC Yukon has engine light on, which OnStar diagnostics said was code U0102, lost communication with transfer case control module, and this light has been preceded by service 4wd message. I'm guessing these problems are related? What can I expect to get this resolved?

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6ya6ya
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Posted on Jan 02, 2017

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limotec
  • 33 Answers

SOURCE: Transfer case in 99 GMC Suburban

Hello
I had this with a C3500 4x4 it was the wiring contection at the transmission please test all these problems as ths may be a cheap fix.

Hope this helps
www.limotec.co.uk
Regards Paul

Posted on Jan 11, 2009

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SOURCE: 2005 gmc yukon xl denali service ride control

it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you

Posted on Mar 16, 2009

  • 1 Answer

SOURCE: 2004 GMC Sierra 1500 4wd. Auto transfer case light issue

I have the same problem. It is intermittent and sometimes shows up with service transmission message. To get rid of it just put the truck in park, press the 2 high button and shift into drive while it is still flashing. I will worry about it more when it blows up. You can drive with the vehicle showing the solid neutral and it seems to make no difference. It has to be a wake up problem between the control modules. It only happens on start up.

Posted on Sep 06, 2009

  • 112 Answers

SOURCE: The 4wd is not working on my 2003 gmc yukon,

Does the truck have a push button selector on the dash? If so, you need to replace the drive motor on the transfur case.

Posted on Jan 03, 2010

Molson02536
  • 3854 Answers

SOURCE: I have a 2005 GMC Yukon XL. The service 4WD is on.

Yes you do have to take it to the dealer, This is a common problem in these trucks. This is caused by a bad encoder sensor in the shifter on the side of the transfer case. The sensor can be replaced with out having to replace the shifter assembly.

THe best test is to get the code from the system. This sensor is a sliding resistor and the material wears off causing a false reading. That is why the lights were showing Nothing, but you were able to drive. The code for the sensor is C0327.

TBS: #PIP3480M: Rattle Drone Or Buffeting Noise At Highway Speed In 2WD Or DTC C0327 - keywords 246 2hi 2high 4WD auto awd buffet buzz case click indicator knock lamp light service tick transfercase transfer vibrati - (Mar 4, 2008) Vehicles involved were built approximately between 01/01/04 and 03/06/06. The noise condition if not noticed by the customer may cause eventual encoder sensor wear causing DTC C0327 set in the Transfer Case Control Module (TCCM).

An updated TCCM calibration has been released to apply light pressure to the transfer case clutch pack and reduce the rattle. The calibration was released on 3/18/07 and the title line will read "to correct transfer case rattle at highway speeds and possible DTC C0327". For Rattle only (no current DTC C0327 set), Install the updated calibration and if necessary follow the diagnostics listed below

If the vehicle has a current or history dtc C0327 and can be diagnosed to the encoder sensor, re-flash with the updated calibrations and replace the encoder sensor as necessary.
Important Note: All NV246 transfer cases built 02/25/06 and beyond are manufactured with pressed fit parts to help reduce the rattle. Inspect the ID tag on the transfer case for this build date and verify the tccm has the latest calibration before repairs are initiated.

Thank you fur using Fixya and good luck.

Posted on Apr 20, 2010

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On 05 chev Tahoe 2 wheel drive it want crank code co292 what do I do to fix it


C0292
Lost Communications with Engine Control System
EBCM
DTC C0290 or C0292 in Antilock Brake System
Your best bet ! Take it to a quaified repair shop . Do you know what Class 2 data bus is ?

Class 2 Serial Data Line
The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
• Audio Amplifier, w/UQ7 and Y91
• Body Control Module (BCM)
• CD Changer (CDX), w/U1S and Y91
• Digital Radio Receiver (DRR), w/U2K or U2L
• Driver Door Module (DDM)
• Driver Seat Module (DSM), w/AN3
• Electronic Brake Control Module (EBCM)
• Electronic Suspension Control (ESC) Module, w/Z55
• Front Passenger Door Module (FPDM)
• Generator Battery Control Module (GBCM)
• HVAC Control Module
• HVAC Control Module - Rear Auxiliary
• Instrument Panel Cluster (IPC)
• Powertrain Control Module (PCM)
• Radio
• Rear Seat Audio (RSA) Controller, w/UK8
• Rear Seat Entertainment (RSE) Assembly, w/U42
• Rear Wheel Steering Control Module (RWSCM)
• Inflatable Restraint Sensing and Diagnostic Module (SDM)
• Transfer Case Shift Control Module (TCSCM), w/NP1/NP8
• Vehicle Communication Interface Module (OnStar), w/UE1
• Vehicle Theft Deterrent (VTD) Module, w/VD1
The class 2 serial data line allows a scan tool to communicate with these modules for testing purposes, checking for DTCs, and to activate/enable/disable functions. These class 2 serial data circuits are bused together via three splice packs and DLC:

Mar 27, 2017 | Cars & Trucks

1 Answer

2006 gmc canyon will not go into 4 wheeldrive after 5 minutes of driving


The first place to start is have it checked for codes an to see if a scan tool will communicate with the 4X4 control module !
Diagnostic Starting Point - Transfer Case
Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information:
?€¢
The identification of the control module or modules that command the system.


?€¢
The ability of the control module or modules to communicate through the serial data circuit.


?€¢
The identification of any stored diagnostic trouble codes (DTCs) and the status of the codes.

The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.
Install a scan tool.
Does the scan tool power up?
Go to Step 3
Go to Scan Tool Does Not Power Up

3

  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with all of the control modules on the vehicle. Refer to Scan Tool Does Not Communicate with Class 2 Device for the modules you should expect to observe.
Does the scan tool communicate with all of the expected vehicle control modules?
If you don't have a scan tool that will communicate with all modules on the vehicle or understand this , your best bet is to take it to a ASE certified repair shop or the dealer .

Jan 07, 2016 | 2006 GMC Canyon Crew

1 Answer

Stuck in 4 wheel Drive High but no lights are lit


Hi Jimi , There are very specific diagnostic procedures to follow for diagnosing this system. First a good visual inspection of the transfer case an fluid level an wiring connections. The transfer case shift control module is equipped with the ability to store diagnostic information, which is useful to a technician in the event of module, component or wiring failures. This information can be retrieved from the transfer case shift control module by way of flash codes, which are displayed on the three transfer case shift control switch buttons. These buttons are located on the instrument panel to the right of the steering wheel Before obtaining DTCs, perform the following transfer case control module (TCCM) Self-Test.
TCCM Self-Test
  1. Observe the transfer case shift control switch indicators while turning the ignition switch to RUN. A properly operating system will flash all indicators and then will return to the current gear. If the system is operating normally, then proceed to Displaying Codes.
  2. If the TCCM failed the Self-Test, then test the following circuits.
  3. ?€¢
    Battery Positive Voltage (40 and 1640), and Ignition 3 Voltage for battery voltage


    ?€¢
    Ground Circuit for ground


    ?€¢
    Diagnostic enable circuit for an open or high resistance


    ?€¢
    Transfer case shift control switch connector

  4. If the above circuits are normal but the TCCM still fails the Self-Test, replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .
DTC Displaying
  1. Turn OFF the ignition for 10 seconds.
  2. Connect PIN 13 on the data link cable (DLC) to a ground. The DLC is located in the cab under the instrument panel on the driver's side.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the transfer case shift control switch select buttons for flashing codes. Refer to Diagnostic Trouble Code (DTC) List .
Important: If the transfer case shift control switch buttons all blink only once and then stop, no fault codes are stored in the transfer case shift control module.
?€¢
When one DTC is stored in memory, that code will blink that number of times followed by a 3 second pause and then repeat.


?€¢
If more than one code is stored, the first code will blink, followed by a 3 second pause and then the second code will blink.


?€¢
This sequence will continue until PIN 13 on the DLC is no longer grounded.


?€¢
If the TCCM will not communicate the presence or absence of DTCs, test the above circuits in Self-Test Step 2. If the circuits are complete, then replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .


Let me know if you have any codes , I have code definitions an procedures.

Feb 04, 2015 | 2003 GMC Sonoma Extended Cab

2 Answers

Trouble codes C0305 C0327 U0100 U0101 U0140


co327 is a code for your transfer case encoder motor and the U codes are communication codes. Most likely cause is the encoder motor needs replacement

Feb 11, 2012 | 2007 GMC Yukon

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

2007 GMC Yukon codes P0121, P2544, U0101


P0121 Is a throttle/pedal position sensor/switch "A" circuit range/performance problem. P2544 torque management request input signal "A". U0101 lost communication with transmission control module. I hope these definitions help.

Aug 26, 2009 | 2007 GMC Yukon

1 Answer

Service 4WD error displays on 2004 Yukon XL with 37,000 miles.


Most common problem is a code for the encoder motor position sensor.
You will not be able to pull a code unless you can communicate with the Transfer case control module, the codes ARE NOT stored in the PCM.
Sensor is about 80 bucks and takes about 2 hours to install (on your back) about 30 min, if you have a lift.

Just a side not, if the light came on. There is a code somewhere

Jun 18, 2009 | 2003 GMC Yukon XL

1 Answer

2007 GMC Yukon wont start....


Ok supper Dave , let's get this stright , when you turn the key to start the vehicle , what happens ? The starter spins the engine or doesn't spin the engine ? This would be a no crank no start condition . if the engine does spin an doesn't start an run this is a crank no start condition . Now which is it ? The factory radio is hooked to the serial data communication network , did you or who ever installed the aftermarket radio use a interface module ? Are you familiar with the electronics on this vehicle ? BCM - body control module , low current inputs from the ignition switch which determine what mode to put the vehicle in ?

Case 4 Data Bus Issues

The body control system consists of the body control module (BCM), communications, and various input and outputs. Some inputs, outputs and messages require other modules to interact with the BCM. The BCM also has discrete input and output terminals to control the vehicle's body functions. The BCM is wired to the GMLAN high speed serial data buss and the GMLAN low speed serial data buss and acts as a gateway between them. If the BCM does not communicate the vehicle will not start due to the inability of the engine control module (ECM)/powertrain control module (PCM) and theft deterrent module (TDM) to communicate without the BCM providing the gateway function.

Power Mode Master
This vehicles body control module (BCM) functions as the power mode master (PMM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination the power mode that will be sent over the serial data circuits to the other modules that need this information, and so the PMM will activate relays and other direct outputs of the PMM as needed. Refer to Power Mode Description and Operation for a complete description of power mode functions.

Sorry but I am a GM Tech . have been for over thirty years , Cadillac , Buick an Chevy .audio buds think it's something else. Your audio buds don't have a clue ? When change something you better well know what your messing with. .

Apr 11, 2017 | 2007 GMC Yukon

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