Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code (DTC) ECM-A0 is stored if the control module detects rapid changes in the engine coolant temperature (ECT).

Substitute value
- No fuel trim
- Limited EVAP control
- No three-way catalytic converter (TWC) diagnostic.

Possible source
- Defective engine coolant temperature (ECT) sensor
- Contact resistance in the terminals.

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- High fuel consumption.