Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition
Diagnostic trouble code (DTC) ECM-9A/9B is stored if the engine control module (ECM) has not succeeded in communicating with the immobilizer within 2 seconds of the ignition being switched on (no communication) or if the control module detects an incorrect VIN code 3 times (faulty VIN).

Hint: Diagnostic trouble codes (DTCs) are stored in the immobilizer in the event of this fault.

Substitute value
None.

Possible source

No communication:
- Open-circuit in the signal cable
- Short-circuit to ground in the signal cable
- Short-circuit to supply voltage in the signal cable
- Contact resistance in the engine control module (ECM) and immobilizer control module terminals
- Defective immobilizer control module.

Faulty VIN:
- The VIN code differs between the engine control module (ECM) and the immobilizer.

Fault symptom[s]
- Engine does not start.