Diagnostic trouble code (DTC) information
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
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.