DTC ECM-9400

Condition
Diagnostic trouble code (DTC) ECM-9400 is stored if, when the engine is running, the engine control module (ECM) registers a fault in the circuit for the brake pedal position sensor, the circuit for the stop lamp switch or in the CAN communication between the brake control module and the engine control module (ECM).

Substitute value
- Cruise control switched off.

Possible source

Signal too high:
- Fault trace the brake control module and the central electrical module.

Faulty signal:
- Fault in the brake control module or in the central electrical module
- Contact resistance or oxidation in the terminals between the engine control module (ECM) and the stop lamp switch
- Open-circuit in the power supply to the stop lamp switch
- Open-circuit or short-circuit to ground or supply voltage in the cable for the stop lamp switch
- Incorrectly installed stop lamp switch
- Defective stop lamp switch.

Signal missing:
- Fault trace the brake control module and the central electrical module.

Fault symptom[s]
- Cruise control does not function at all.