Theft Deterrent System Starter Disable
2002-2002 Dodge Ram 2500 5.9L I6 Cummins Diesel
The 2002 Dodge Ram 2500 is equipped with a 5.9L inline-6 diesel engine. Below you'll find detailed b0124 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The theft deterrent system has disabled the starter circuit due to a detected theft condition or system malfunction.
Symptoms
- Engine will not crank
- Security light on solid
- Key turns but starter does not engage
- No-crank no-start condition
Common Causes
- Theft system triggered by incorrect key
- System malfunction falsely detecting theft
- BCM starter relay driver failure
- Immobilizer-theft system communication error
Diagnostic Steps
- Verify key is correct for vehicle
- Perform theft system reset procedure
- Scan BCM and immobilizer codes
- Test starter relay control circuit
- Check theft system arm/disarm status
Repair Notes
Perform theft system relearn or reset. If BCM is faulty, replace and program.
Related Codes
Other Body Codes
- B0001Driver Frontal Stage 1 Deployment Control
- B0002Driver Frontal Stage 2 Deployment Control
- B0003Passenger Frontal Stage 1 Deployment Control
- B0004Passenger Frontal Stage 2 Deployment Control
- B0005Driver Knee Airbag Deployment Circuit
- B0006Passenger Knee Airbag Deployment Circuit
- B0010Driver Side Airbag Deployment
- B0011Driver Side Airbag Deployment Circuit Open
- B0012Driver Side Airbag Deployment Circuit Short to Ground
- B0013Driver Side Airbag Deployment Circuit Short to Battery
B0124 on Other Vehicles
Common Questions
What does code B0124 mean on a 2002-2002 Dodge Ram 2500?
B0124 stands for "Theft Deterrent System Starter Disable". The theft deterrent system has disabled the starter circuit due to a detected theft condition or system malfunction.
What are the symptoms of B0124 on a Dodge Ram 2500?
Common symptoms of B0124 include: Engine will not crank, Security light on solid, Key turns but starter does not engage, No-crank no-start condition.
What causes B0124 on a 2002-2002 Dodge Ram 2500?
Common causes of B0124 include: Theft system triggered by incorrect key, System malfunction falsely detecting theft, BCM starter relay driver failure, Immobilizer-theft system communication error.
Last updated: March 2026