P0698
PowertrainPcm Referencehigh severitySensor Reference Voltage C Circuit Low
What P0698 Means
The sensor reference voltage circuit C is reading below the expected 5 volts. This is usually caused by a short to ground or an overloaded reference.
Symptoms
- Check engine light on
- Multiple sensor faults
- Rough running engine
Common Causes
- Short to ground in reference wire
- Shorted sensor
- Damaged connector
- Faulty PCM
Diagnostic Steps
- Confirm low reference voltage with meter
- Inspect wiring for shorts to ground
- Isolate sensors to find the fault
- Repair wiring or replace PCM
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