Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM2024PROMASTER 3500 BASE, CUTAWAYREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 25 (BATTERY PACK CONTROL MODULE (BPCM) - DTCS B1CE9-00 TO P0A7E-00)DTC TROUBLESHOOTINGP0668-00 CONTROL MODULE INTERNAL TEMPERATURE SENSOR 1 CIRCUIT LOWPRELIMINARY DIAGNOSTIC CHECKS
2024 Dodge and Ram ProMaster 3500 Base, Cutaway
Preliminary Diagnostic Checks
2024 Dodge and Ram ProMaster 3500 Base, CutawaySECTION Preliminary Diagnostic Checks
WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.
- Check for any Service Bulletins, Star On-line Cases or ECU flash updates that apply for the DTC or symptom.
- Check for any 12-volt battery voltage DTCs in the ECU. Low battery voltage can cause other system DTCs.
- Check for High Voltage related communication DTCs and repair before continuing.
- Circuit faults should typically be diagnosed before rationality/performance faults.
- Check the High Voltage Battery low voltage harness connector(s) for proper connection at the High Voltage Battery. Verify that the connector is completely plugged in and properly locked prior to disconnecting for testing. Disconnect the High Voltage Battery harness connector and check for water intrusion and any pushed out, damaged, corroded, burnt, or spread terminals.
- Check the overall High Voltage System for DTCs, proper connection and operations of external HV components that could be contributors to Battery Pack Control Module (BPCM) DTCs and repair as required before BPCM failures are addressed.
- If any problems were found, repair according to Service Information. Refer to STANDARD PROCEDURE .
- Check for any Service Bulletins, Star On-line Cases or ECU flash updates that apply for the DTC or symptom.
- Check for any 12-volt battery voltage DTCs in the ECU. Low battery voltage can cause other system DTCs.
- Check for High Voltage related communication DTCs and repair before continuing.
- Circuit faults should typically be diagnosed before rationality/performance faults.
- Check the High Voltage Battery low voltage harness connector(s) for proper connection at the High Voltage Battery. Verify that the connector is completely plugged in and properly locked prior to disconnecting for testing. Disconnect the High Voltage Battery harness connector and check for water intrusion and any pushed out, damaged, corroded, burnt, or spread terminals.
- Check the overall High Voltage System for DTCs, proper connection and operations of external HV components that could be contributors to Battery Pack Control Module (BPCM) DTCs and repair as required before BPCM failures are addressed.
- If any problems were found, repair according to Service Information. Refer to STANDARD PROCEDURE .
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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.