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HOMESERVICE MANUALSPONTIAC2004MONTANA VAN PASSENGERREPAIR AND DIAGNOSISBRAKESANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC C1237TEST DESCRIPTION
2004 Pontiac Montana Van Passenger

Test Description

2004 Pontiac Montana Van PassengerSECTION Test Description
  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 instrument cluster. 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 Value(s) 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 Battery Voltage parameter in ABS data list.
Does the scan tool indicate that the voltage is greater than the specified value?		 17 V Go to Step 3  Go to Diagnostic Aids
3  With a scan tool, observe the Ignition 1 parameter in the Instrument Panel Cluster data list.
Does the scan tool indicate the voltage is greater than the specified value?		 17 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 text.
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.