OBD-II code · Powertrain (generic, extended)
P28C0 Ion Sense Module Supply Voltage Circuit
The ECM detects a generic fault on the supply voltage circuit of the ion sense module. The module can no longer reliably bias the spark plug for ion current measurement.
Is it safe to drive with P28C0?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule supply rail interrupted
- PossibleWiring or connector fault
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Ion Sense Module, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.