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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 708 (ANTILOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0055 OR C003DTEST DESCRIPTION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Test Description

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Test Description
WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests for a voltage signal from the PCM.
  2. 4:  This step tests for a missing or erratic vehicle speed signal from the PCM. An assistant may be required to perform this test.
DTC C0055 or C003D

Step Action Values Yes No
Schematic Reference: ABS Schematics 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Use a scan tool in order to clear the DTCs.
  2. Operate the vehicle at a speed greater than the specified value.
Does the DTC set?		 13 km/h (8 mph) Go to Step 3  Go to Diagnostic Aids
3
  1. Turn OFF the ignition.
  2. Disconnect from the electronic brake control module (EBCM), the harness connector containing the vehicle speed signal circuit.
  3. Turn ON the ignition.
  4. Use a DMM in order to measure the DC voltage between the vehicle speed signal circuit and a good ground.
Does the voltage measure greater than the specified value?		 10 V Go to Step 4  Go to Step 7 
4
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Place the transmission in neutral (N).
  3. Set up the DMM in order to measure the DC voltage between the vehicle speed signal circuit and a good ground.
  4. Slowly spin the rear wheels by hand for at least 30 seconds and while ensuring the driveshaft is rotating, observe the DMM.
Does the voltage measure within the specified range for the entire time that the driveshaft is rotating?		 5-7 V Go to Step 5  Go to Step 7 
5 Inspect for poor connections at the harness connector of the electronic brake control module (EBCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
6 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 10  -
7 Test the vehicle speed signal circuit for an open, a short to ground, or a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
8 Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
9 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 3  System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.