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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 925 (ANTI-LOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0131TEST DESCRIPTION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Test Description

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Test Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2007 GMC Savana Special, 2007 GMC Savana Camper Special, 2007 GMC Savana, 2007 Chevrolet RV Cutaway, and 2007 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  This step is required for vehicles equipped with a hydro-boost brake assist system only. If the vehicle being serviced has vacuum assisted brakes, proceed to step 4.
DTC C0131

Step Action Yes No
Schematic Reference: Antilock Brake System Schematics 
IMPORTANT: Use the scan tool to read both current and history DTCs before proceeding. If DTC C0292 is set, diagnose that DTC before proceeding with diagnostics for C0131.
If DTC C0161 is set, diagnose that DTC before proceeding with diagnostics for C0131.
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2 Inspect the vehicle for the following and ensure that there is no base brake failure.
  • Dragging brakes
  • Faulty parking brake switch
  • Brake fluid leakage
  • Air in hydraulic system
  • Seized brake calipers
  • Swollen, kinked or otherwise damaged brake hoses

Did you find and correct the condition?		 Go to Step 9  Go to Step 3 
3  Drive the vehicle in order to verify that the brakes do not self-apply during turning maneuvers.
Do the brakes self-apply during turning maneuvers?		 Go to Symptoms - Hydraulic Brakes Go to Step 4 
4
  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 5  Go to Diagnostic Aids
5
  1. Select the vehicle stability enhancement system (VSES) Data Display function on the scan tool.
  2. Observe the Brake Switch Status parameter while pressing and releasing the brake pedal.
Does the Brake Switch Status change while pressing and releasing the brake?		 Go to Step 6  Go to DTC C0161 (W/JL4)  or DTC C0161 (W/O JL4) 
6
  1. Remove the electronic brake control module (EBCM) from the vehicle. Refer to Control Module References .
  2. Inspect the master cylinder pressure sensor connector within the EBCM for damage or corrosion.
Is there connector damage or corrosion present?		 Go to Step 7  Go to Step 8 
7
IMPORTANT: Following EBCM replacement, perform the set-up procedure for the EBCM and perform the Yaw Rate Reference Table Reset Procedure. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM. Refer to Control Module References .Did you complete the replacement?		 Go to Step 9  -
8
IMPORTANT: Following EBCM replacement, perform the set-up procedure for the EBCM and perform the Yaw Rate Reference Table Reset Procedure. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM and the brake pressure modulator valve (BPMV). Refer to Control Module References .Did you complete the replacements?		 Go to Step 9  -
9
  1. Use the scan tool Clear All Class 2 DTCs function to clear all of the DTCs from all modules.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  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.