P1351high severityPowertrain
Ignition Diagnostic Monitor Signal Lost
on 2021 Mazda Mazda3 2.5L I4 · FWD
What this code means
The PCM has lost the ignition diagnostic monitor signal. The ignition system is not providing a confirmation signal back to the PCM that the ignition events are occurring as commanded.
Symptoms
- Check Engine Light
- Engine may not start
- Engine stalls
- Rough running
- Misfires on multiple cylinders
Common causes
- Faulty ignition module
- Damaged wiring between ignition system and PCM
- Failed ignition coil pack
- Corroded ignition system connector
- PCM IGF input circuit fault
Diagnostic steps
- Test ignition module output signal
- Inspect wiring from ignition system to PCM
- Check ignition coil primary and secondary resistance
- Test for spark at each cylinder
- Verify PCM receives IGF signal
Repair notes
Replace the ignition module or coil pack if the diagnostic monitor signal is absent.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1