CONFIRMED FIXES FOR CHEVROLET TRUCKS
Item# confirmed-fixes-for-chevrolet-trucks

Product Description

Description Potential Causes Confirmed Fix 1. The odometer and Park Reverse Neutral Drive Low (PRNDL) are dark. The message center is dark at times. The gauges work OK. Power/ground test good at the IPC. Wiggled IPC connection, no change.... 2002 Chevrolet Silverado 1500 5.3L, GAS, Vin T, Eng Cfg V8 Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Test voltage on the following fuses with the key on: CRUISE, IGN0, IGN1. 2. Key On Engine Off (KOEO), should have 12v at each. 3. If not, check voltages at the ignition switch. 4. ...

6 Confirmed fixes Ignition Switch Instrument Panel Cluster (IPC) 4 - Instrument Panel Cluster (IPC) 1 - Add-On Alarm System, Add-On Remote Starter 1 - Ignition Switch

2. Fuel gauge and temperature gauge are erratic. Very intermittently the speedometer and tachometer are also erratic. Suspects fuel tank sender. Owner states shutting the door or moving the dash/Instru... 2002 Chevrolet Silverado 1500 5.3L, GAS, Vin T, Eng Cfg V8 Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Scan Powertrain Control Module (PCM) fuel level and temperature data during the problem. 2. If the data is correct/consistent, test the IPC powers at terminal A4 Brown wire ignition power fro...

4 Confirmed fixes Instrument Panel Cluster (IPC) Ground Supply Instrument Panel Cluster (IPC) Power Supply Scan Data Terminal Contact 3 - Instrument Panel Cluster (IPC) 1 - Instrument Cluster Ground Wiring

3. The Service 4WD lamp is on at times. Transfer Case Control Module (TCCM) codes: C0323, C0387. The transfer case shifts OK now, codes are not current. The entire transfer case was replaced, fixe... 2002 Chevrolet Silverado 1500 5.3L, GAS, Vin T, Eng Cfg V8 Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Disconnect the TCCM. 2. Connect an ammeter from pin E1, Tan wire to ground. 3. Check amp draw of the transfer case brake control solenoid, should have 0.4 to 0.7 amps. 4. If OK, lea...

1 Confirmed fix Connector C151 Transfer Case Shift Motor 1 - Transfer Case

4. The security light flashes all by itself when driving or with the key off and doors shut. The Anti-lock Brake System (ABS) light comes on. The fuel gage goes to E. The Supplemental Restraint System... 2002 Chevrolet Silverado 1500 5.3L, GAS, Vin T, Eng Cfg V8 Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check the SRS light on/off status in the Sensing and Diagnostic Module (SDM) and Instrument Panel Cluster (IPC) data. 2. Use a Tech 2 scanner to command the SRS light on when it flashes. 3...

1 Confirmed fix Ground Instrument Panel Cluster (IPC) Power 1 - Auto-Start System

5. Fuel gauge is intermittent and the charge indicator comes on at times.... 2002 Chevrolet Silverado 1500 5.3L, GAS, Vin T, Eng Cfg V8 Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check for loss of voltage from the ignition switch. 2. Check the ground and splice pack SP203, which is at the top left of the instrument panel near the A pillar. 3. Use the scan tool and o...

1 Confirmed fix Poor Ground Ignition Switch Instrument Panel Cluster (IPC) 1 - Instrument Panel Cluster (IPC)

6. The tow/haul button is inoperative. The tow lamp does not illuminate on the dash when depressing the button. No Powertrain Control Module (PCM) or Body Control Module (BCM) codes.... 2002 Chevrolet Avalanche 1500 5.3L * Test Details... Confirmed Fix Details...

Tests/Procedures: 1. With a scan tool, check status of the tow/haul input as the button is pushed, should transition from off to on. 2. If not OK, check the voltage at the BCM, pin B12, Light Blue wire at the bro...

39 Confirmed fixes Tow/Haul Switch Grounded Tow/Haul Switch Wiring Open Tow/Haul Switch Wiring 14 - Tow/Haul Switch Wiring 7 - Tow/Haul Switch 5 - Wire 4 - Shift Lever Assembly 3 - Shifter Assembly 3 - Wiring Harness 2 - Gear Shift Lever Components 1 - Circuit

7. Intermittently, all of the gauges will go blank and the transmission goes into limp in mode. Trouble codes P0740, 785, 1860, 753 and 758 in the PCM. There is also an airbag code. This shop has never ... 2002 Chevrolet Avalanche 1500 5.3L * Test Details... Confirmed Fix Details...

Tests/Procedures: Try to get the problems to duplicate. If it does, check for a voltage drop to the ING 0 fuse from the ignition switch....

6 Confirmed fixes Ignition Switch 5 - Ignition Switch 1 - Aftermarket Radio Wiring

8. Intermittent loss of Instrument Panel Cluster (IPC) operation. Mostly when hitting a bump in the road. Will not respond to tapping on the dash however. A rebuilt IPC tried, same. Has not check... 2002 Chevrolet Avalanche 1500 5.3L * Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check for IPC codes in scan data. 2. Remove the IPC, reconnect connectors. 3. Key on, tap on the IPC directly, check for response. 4. If so, check terminal contact, replace IPC if c...

4 Confirmed fixes Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC) Ground Supply Instrument Panel Cluster (IPC) Power 2 - Instrument Panel Cluster (IPC) 1 - G103 Ground Connector 1 - Instrument Panel Cluster (IPC) Ground Supply

9. No communication with anything on the data line. The gauges in the Instrument Panel Cluster (IPC) are not working.... 2002 Chevrolet Avalanche 1500 5.3L * Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Locate the SP205 splice pack in the harness, just underneath the Body Control Module (BCM). 2. Remove the finger from the splice pack and use a jumper to connect the data wire to one specific m...

2 Confirmed fixes Shorted Component Shorted Wire 1 - Powertrain Control Module (PCM) Connector 1 - Sensor Diagnostic Module (SDM)

10. Intermittent loss of Instrument Panel Cluster (IPC) operation. Mostly when hitting a bump in the road. Will not respond to tapping on the dash however. A rebuilt IPC tried, same. Has not check... 2002 Chevrolet Avalanche 1500 5.3L * Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check for IPC codes in scan data. 2. Remove the IPC, reconnect connectors. 3. Key on, tap on the IPC directly, check for response. 4. If so, check terminal contact, replace IPC if c...

2 Confirmed fixes Instrument Panel Cluster (IPC) Malfunctioning Instrument Panel Cluster (IPC) Ground Supply Malfunctioning Instrument Panel Cluster (IPC) Power Supply 1 - Instrument Panel Cluster (IPC) Ground Supply 1 - IPC Ground Wiring. Setting DTC C0379.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check voltage at the front axle actuator pin D Brown wire with the key in the run position. 2. Using the scan tool check the front axle switch input as the transfer case in engaged and diseng...

7 Confirmed fixes Connector Front Axle Actuator Ground Power Transfer Case Control Module (TCCM) Wiring 2 - Front Axle Actuator 2 - Transfer Case Control Module (TCCM) 1 - Connector 1 - Front Axle Actuator Wiring 1 - Front Axle Switch

2. Service 4WD light on and setting DTC C0550.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Try to communicate with the Transfer Case Control Module (TCCM). 2. If no communications remove the underhood (ATCM or TREC) TCCM fuse and wait 30 seconds. 3. Reinstall the fuse, the m...

3 Confirmed fixes Connector Ground Power Transfer Case Control Module (TCCM) Wiring 3 - Transfer Case Control Module (TCCM)

3. Transfer Case Control Module (TCCM) codes: C0550, B2725. Has tried a new engage switch and a new TCCM. The GM dealer cannot program the new TCCM, no communication. Has TCCM communication with ... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Remove Splice Pack (SP) 205. 2. Jumper A Purple to C Dark Green/White. 3. Attempt to program TCCM....

3 Confirmed fixes Noise Noise on the Class 2 data line. Transfer Case Control Module (TCCM) 2 - Transfer Case Control Module (TCCM) 1 - Connector

4. "Service 4WD" indicator is on. Transfer case in neutral and won't shift. Trouble code C0321, C0327, C0550.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. GM has a TSB 02-04-21-006E for this code. 2. On the 2002 model, replace and reprogram the Transfer Case Control Module (TCCM) per the TSB. 3. Replace transfer case encoder sensor. Perform T...

3 Confirmed fixes Encoder Sensor Transfer case encoder sensor. Transfer Case Control Module (TCCM) 1 - Ground 1 - Transfer Case Control Module (TCCM) 1 - Transfer Case Encoder Motor Wiring

5. Service 4WD light comes on. Code B2725, C0327, C0550 Feels like the transfercase is in 4WD at times.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Replace the transfer case switch per code B2725. See TSB #02-04-21-002A. 2. Reprogram the Transfer Case Control Module (TCCM) per code C0550. 3. Perform TSB #03-04-21-001D per code C0327....

2 Confirmed fixes Connection Encoder Sensor Transfer Case Control Module (TCCM) Transfer Case Control Module (TCCM) Programming Transfer Case Selector Switch 1 - Transfer Case Control Module (TCCM) 1 - Transfer Case Selector Switch

6. The 4WD will not shift and setting DTC C0550.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Try to communicate with the TCCM. 2. If no communications remove the underhood (ATCM or TREC) TCCM fuse and wait 30 seconds. 3. Reinstall the fuse, the module should "wake up" and comm...

2 Confirmed fixes Connector Ground Power Transfer Case Control Module (TCCM) Wiring 2 - Transfer Case Control Module (TCCM)

7. The scan tool will not communicate with the Transfer Case Control Module (TCCM). No other scanner to use. The transfer case will not shift and the lights on the switch do not come on.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check for Battery Voltage (B+) at the TCCM pin B Orange wire on the C3 connector and for a good ground at pin A Black wire. 2. Check for a good ground at the TCCM C1 connector pin B8 Black/Wh...

2 Confirmed fixes Ground Power Transfer Case Control Module (TCCM) Wiring 2 - Transfer Case Control Module (TCCM)

8. The scan tool will not communicate with the Transfer Case Control Module (TCCM). No other scanner to use. The transfer case will not shift and the lights on the switch do not come on.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check for Battery Voltage (B+) at the TCCM pin B Orange wire on the C3 connector and for a good ground at pin A Black wire. 2. Check for a good ground at the TCCM C1 connector pin B8 Black/Wh...

2 Confirmed fixes Ground Power Transfer Case Control Module (TCCM) Wiring 1 - 4WD TCCM 1 - TCCM Program

9. Intermittent trouble code B2725.... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Inspect the switch per bulletin #02-04-21-002A - (02/11/2003), replace/repair as needed. 2. Call any GM dealership or Division Chevrolet 1-800-222-1020, Deaf, Hearing Impaired, or Speech Im...

2 Confirmed fixes Switch Transfer Case Control Module (TCCM) Transfer Case Control Module (TCCM) Programming 2 - 4WD Switch

10. The service 4WD message is displayed on the dash and the 4WD will not engage. The scan tool will not communicate with the Transfer Case Control Module (TCCM) but there was a code U1000 in some of the... 2002 Chevrolet Trailblazer 4.2L Test Details... Confirmed Fix Details...

Tests/Procedures: 1. Check for Battery Voltage (B+) at the TCCM pin B Orange wire on the C3 connector and for a good ground at pin A Black wire. 2. Check for a good ground at the TCCM C1 connector pin B8 Black/Whit...

2 Confirmed fixes Ground Power Transfer Case Control Module (TCCM) Wiring 2 - Transfer Case Control Module (TCCM)

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