Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-2120

Condition




This diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers a short-circuit to ground or supply voltage or an open-circuit in the circuit for the front probe control.
The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

Substitute value
- The fuel trim is shut off.

Possible source

Signal too high
- Short-circuit to supply voltage in the signal cable
- Short-circuit to ground in the signal cable
- Damaged heated oxygen sensor (HO2S) or probe control circuit.

Signal too low
- Open-circuit in the signal cable
- Damaged heated oxygen sensor (HO2S) or probe control circuit.

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