PCV Heater A Control Circuit Open
The heater on PCV path A - used to prevent ice plugs in the crankcase ventilation hose during cold weather - has an open control circuit. Without it, condensation can freeze and block PCV flow, raising crankcase pressure dangerously.
Affected components
- Pcv heater a
- Pcv heater wiring a
Common causes
- High likelihood: Open in harness or heater element
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.