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.