P1345critical severityPowertrain
No CMP or SGC Signal
on 2017 Mazda Mazda3 2.5L I4 · FWD
What this code means
The PCM is not receiving a Camshaft Position sensor or Signal Generator C signal. Without this signal, the PCM cannot determine camshaft position for sequential fuel injection and ignition timing, resulting in a no-start or severe running condition.
Symptoms
- Engine cranks but will not start
- Engine runs very rough if it starts
- Check Engine Light
- Backfiring
Common causes
- Faulty CMP sensor
- Damaged CMP sensor wiring
- CMP sensor connector disconnected
- Damaged reluctor ring
- Timing belt or chain failure affecting cam signal
Diagnostic steps
- Check for CMP sensor signal on scan tool during cranking
- Inspect CMP sensor connector and wiring
- Test CMP sensor resistance
- Check CMP sensor air gap
- Verify timing belt or chain condition
Repair notes
Replace the CMP sensor if it is not producing a signal; check timing belt or chain condition.
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