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2004 gmc transfer case control module - GMC Cars & Trucks

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Posted on Dec 04, 2016

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2004 gmc envoy 4wd issues, can only go into 2wd and 4 low? what might be causing this or what should I replace?


Without hooking up a factory or professional scan tool an checking for DTC'S - diagnostic trouble code's . And or going through other diagnostic procedures for Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode an other diagnostic testing procedures ,you should not replace anything . You best bet ,take it to a qualified repair shop. Do you know what DTC'S are ? What an electronic control module is ?
The transfer case brake control is supplied voltage at all times, with the key ON, through the B+ circuit. The brake control is activated when the transfer case shift control module registers the following modes:
• AUTO FWD
• 4HI
• 4LO
This is accomplished when the transfer case shift control module provides ground to the brake control through the T-Case Lock circuit. If there is a fault in the brake control circuit, the transfer case shift control module goes into a shift block mode. The shift block mode causes the mode indicator to flash for 10 seconds when another mode is selected. After the 10 second period has ended, the indicator reverts back to the previous mode selection.

DTC B0770
DTC B0775
DTC B0780
DTC B0785
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550

Without proper diagnostic tool's an factory service repair information an knowledge how it work's , very doubtful you could fix these , or should you try .

Jan 06, 2018 | GMC Cars & Trucks

1 Answer

What does it mean when the service 4wd light comes on in my 2002 gmc envoy?


It means the transfer case control module has detected an error in the system...it could be the encoder motor, transfer case, dash switch assembly, axle engagement assembly or even the transfer case control module (TCCM) itself..you will have to take it in and have the the TCCM read for codes

Mar 26, 2015 | 2002 GMC Envoy

1 Answer

Have a 2004 gmc yukon getting codes c0040, c0550,c0455,c0296 in the abs computer. Trac and abs light on as well as suspension control.


C0040 - Right Front Wheel Speed Circuit Malfunction
C0550 - ECU Malfunction - internal write / checksum malfunction
C0455 - Either:
  • A bent terminal or poor connection at the SWPS may be one possible cause; or
  • The vehicle stability enhancement system (VSES) electronic brake control module (EBCM) calibration may be the other possible cause.
C0296 - Transfer Case Delivered Torque for Stability Control System Circuit
http://www.obd-codes.com/trouble_codes/obd-ii-c-chassis-codes.php

Feb 27, 2015 | 2004 GMC Yukon

1 Answer

Where is the transfer case control module on 98 gmc sierra


It is located under the passenger side kick panel. Remove the plastic kick panel cover to reveal the TCCM.

Nov 02, 2012 | 1998 GMC Sierra

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

2 Answers

2000 jimmy cant turn 4 wheel drive on pushed thev button n light keeps on flashing n 4 wheel drive


The simple answer is to replace the TCCM (transfer case control module).
Being both cheap and inquisitive, I wanted to investigate further, and I will provide a more in-depth answer.

This answer pertains to various GM vehicles. These include the Chevy Blazer, GMC Jimmy, S10, S15, Sonoma vehicles from 1999, 2000, 2001, 2002, 2003, 2004, & 2005.
Specifically the 15748800 module for the NP8 option 4 button automatic 4X4 NVG-236/246 transfer case.

I doing research online, I find that 15154323 might be an alternate TCCM, and that GM redesigned the module and now sells the replacement for this module with a 12577412 part number for about $300.

This information refers to the 15748800 module.
2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-0.jpg Symptoms. If the vehicle is started and driven in 2 hi, the vehicle operates normally.
If the driver attempts to switch the transfer case into any other mode, the transfer case makes noise as it shifts, the service 4x4 light comes on and the newly selected mode indicator light starts to flash.

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-2.jpg The TCCM is mounted behind the passenger side kick panel cover. It should be removed but left connected. Pin F4 should be monitored with either a lamp or meter. This pin should be high or 12 volts when in 2 wheel drive, and low or ground when in 4 wheel drive.
A quick test of the system is to ground the F4 pin, recycle the ignition, and try shifting the transfer case into and out of 4 wheel drive. ( I used a lamp based test light to be safe. Do not an LED based one.) If the mode indicator light remains steady and the Service 4X4 does not light, proceed with this repair procedure. If this does not resolve the issue, please proceed to troubleshoot the front vacuum system, 4X4 solenoid, 4X4 actuator, front axle, or front axle indicator switch.

If this test appears to resolve the issue, you will need to remove the TCCM module from the vehicle. Bend the 8 tabs away from the back cover. Remove the top cover, unscrew the board from the back cover / plate. turn over the board at a static safe work station, and measure the indicated 10,000 ohm SMD resistor. In this module, the resistor is required to operate near it's limits, and I believe that the conformal coating trapped heat and caused the resistor to fail. You can check other resistors nearby for a relative comparison. If found to be open, the resistor can be replaced with a higher power value 10,000 ohm SMD resistor, or a conventional 10,000 ohm resistor with wired leads.

The TCCM should be checked for corrosion on the connectors and cleaned if nessacary. The module can then be restored to the vehicle, and your 4X4 should work normally.

Please respond if this procedure helps you.

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-5.png Front view / pin side
f16f1 Connector Part Information1205210716 Way F Micro-Pack 100 Series (ORN) Pin Wire Color Circuit No. Function
E1 Tan 1569 Transfer Case Lock Soleniod Output
E2 - - Not Used
E3 PNK 1561 AWD/4WD Indicator Lamp Output
E4 Lt GRN/BLK 1563 2 HI Indicator Lamp Output
E5 BRN/WHT 1555 Transfer Case Position Switch Encoder Signal
E6 RED/WHT 1556 Transfer Case Position Switch Encoder Signal
E7 YEL/BLK 1558 Transfer Case Position Switch Encoder Signal
E8 DK BLU/WHT 1557 Transfer Case Position Switch Encoder Signal
E9 DK GRN/WHT 1133 Class 2 Serial Data Signal
E10 BRN 241 Fuse Output - Ignition 3 - Type III Fuse
E11 PPL 806 Fuse Output - Crank - Type III Fuse
E12 YEL 400 Vehicle Speed Sensor Signal
E13 PPL 401 Vehicle Speed Sensor Return
E14 BLK/WHT 1695 Four Wheel Drive Front Wheel Lock Telltale
E15 - - Not Used
E16 BLK/WHT 451 Engine Control Module Ground
F1 PPL/WHT 1565 4 LO Indicator Lamp Output
F2 TAN/BLK 1566 4 HI Indicator Lamp Output
F3 BRN 1560 Neutral Indicator Lamp Output
F4 GRA/BLK 1570 Front Axle Actuator Output
F5 LT BLU 2221 Vehicle Speed Sensor Signal
F6 DK GRN 2222 Vehicle Speed Sensor Return
F7 GRA/BLK 1694 Four Wheel Drive Switch Signal - Low
F8 - F11 - - Not Used
F12 BLK/WHT 1554 Transfer Case Encoder Signal Return
F13 LT GRN/BLK 431 Reference Voltage Feed - 8 Volt Reference
F14 LT GRN/BLK 431 Reference Voltage Feed - 8 Volt Reference
F15 - - Not Used
F16 LT BLU 1693 Four Wheel Drive Switch Signal
2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-9.png Front view / pin side

Connector Part Information120528564 Way F Metri-Pack 280 Series (BLK) Pin Wire Color Circuit No. Function
A BLK 1552 Transfer Case Motor Feed - Clockwise
B RED 1553 Transfer Case Motor Feed - Counterclockwise
C BLK 1050 Ground
D ORG 1640 Fuse Output - Battery - Type III Fuse
2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-14.jpg

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-20.jpg

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-27.jpg

Jan 28, 2011 | 2000 GMC Jimmy

1 Answer

I have a 2004 GMC Sierra 1500 4WD. It will occasionally switch into auto or other 4 wheel drive setting. This normally occurs when I first start the truck. Sometimes it will not switch out of what ever...


transfer case, both are electronically shifted by the TCCM (Transfer Case Control Module)...so you may have a selector switch (dash) or mode sensor issue, that needs replacing on the encoder motor in the transfer case.

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Oct 23, 2017 | GMC Sierra 1500 Cars & Trucks

1 Answer

My 2002 GMC Envoy XL does not shift into 4 wheel drive. It is currently in 2H, when I turn the dial to 4H, the light does not flash or shift into 4H. This is the first time I tried shifting to 4H since...


Check to see if any of the other switch selections ( A4WD, 4LO) turn on a light, if not, the problem could be the switch itself or the TCCM (Transfer Case Control Module). If you get a flashing light condition for a switch selection, then the problem could be the actuator on the Transfer Case.

Dec 12, 2010 | 2004 GMC Envoy

1 Answer

Canyon 4wheeldrive light turned on


Checking the 4X4 control module for DTC'S - diagnostic trouble codes is what you should done . Need a factory or professional type scan tool , no an OBD2 code reader . Looking at factory service repair info. description of how it works , an testing is how to diagnose . Not guessing an throwing parts at it .
DTC B2725
The accessory switch circuit consists of 4 modes. The transfer case shift control module supplies 5 volts to the switch through the switch signal circuit. The current travels through the resistor of the currently active mode. The current on the switch signal circuit is monitored by the transfer case shift control module. The voltage on the switch signal circuit will vary depending on which mode button is pressed by the driver.
The transfer case shift control module constantly monitors the switch signal circuit to determine the condition of the accessory switch circuit.
When each of the modes are selected they complete a circuit through their own specific resistor. The transfer case shift control module continuously monitors the switch signal circuit to determine whether the Neutral, 2HI, 4HI, or 4LO mode was selected by the driver.

DTC C0327 Encoder Circuit Malfunction
The transfer case shift control module has 4 encoder circuits, and each circuit is supplied 12 volts. These 4 circuits are A, B, C, and P, and each circuit runs to a switch located inside the encoder/motor assembly. When a particular encoder circuit is active, the switch is closed, and the 12 volts are grounded by the switch inside the encoder.
The transfer case shift control module supplies 12 volts on all the circuits. The module can interpret the location of the transfer case shift position when the circuits are grounded.
This DTC detects a fault when it compares the shift sequence/strategy to a chart located in read only memory (ROM), within the electronic control unit (ECU), within the transfer case shift control module. This is accomplished by the module reading the different combinations of encoder signals being grounded while others remain high depending on what mode or range the transfer case is in.

DTC C0550 ECU Malfunction
At each power-up, the transfer case shift control module runs a self-test on the following functions:
• EEPROM Checksum
• ROM Checksum
• RAM Checksum
• RAM Malfunction

I suggest your take your vehicle to a qualified repair shop .

Dec 31, 2017 | 2005 GMC Canyon

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