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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 536 (ANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C1237TEST DESCRIPTION
2006 Chevrolet Suburban C2500, 6.0 U

Test Description

2006 Chevrolet Suburban C2500, 6.0 USECTION Test Description
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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. 2:  Use the scan tool in order to inspect the voltage to the EBCM.
  2. 3:  Use the scan tool in order to inspect the voltage to the body control module (BCM). A high voltage value in multiple modules indicates a concern in the charging system.
  3. 4:  Verifies that the condition is still present.
DTC C1237

Step Action Values Yes No
Schematic Reference:  ABS Schematics  
1 Did you perform the ABS Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - ABS 
2 
  1. Turn OFF all of the accessories.
  2. Install a scan tool.
  3. Start the engine
  4. Run the engine at approximately 2000 RPM.
  5. With a scan tool, observe the Switched System Battery Voltage parameter in the ABS data list.
Does the scan tool indicate that the voltage is greater than the specified value?		 16.3 V Go to Step 3  Go to Diagnostic Aids
3  With a scan tool, observe the Battery Volts parameter in Body Control Module data list.
Does the scan tool indicate the voltage is greater than the specified value?		 16.3 V Go to Diagnostic System Check - Engine Electrical in Engine Electrical Go to Step 4 
4 
  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 test.
Does the DTC reset?		 - Go to Step 5  Go to Diagnostic Aids
5 Replace the EBCM. Refer to Electronic Brake Control Module Replacement .
Did you complete the repair?		 - Go to Step 6  -
6
  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 test.
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.