Positive Crankcase Ventilation Heater Control Circuit /Open
This code means the PCM/ECM has detected a fault affecting positive crankcase ventilation heater control circuit /open. The exact root cause depends on the vehicle, but diagnosis usually starts with scan data, visual inspection, connector checks, and basic circuit testing.
What You Might Notice
- Check Engine Light illuminated
- Failed emissions or readiness monitor
- Reduced fuel economy
- Cold-start drivability issue
- No obvious symptom besides the warning light
Most Common Causes
- 1
Open circuit in the affected wiring or component
- 2
Wiring or connector problem
- 3
Low voltage or poor ground
- 4
Mechanical issue in the affected system
- 5
PCM/ECM fault
How to Diagnose It
- 1
Check Open circuit in the affected wiring or component — Inspect for signs of failure and test before replacing.
- 2
Check Wiring or connector problem — Inspect for signs of failure and test before replacing.
- 3
Check Low voltage or poor ground — Inspect for signs of failure and test before replacing.
- 4
Check Mechanical issue in the affected system — Inspect for signs of failure and test before replacing.
- 5
Check PCM/ECM fault — Inspect for signs of failure and test before replacing.
How to Fix It
- 1
Verify the fault with a scan tool
- 2
Inspect the affected circuit or component
- 3
Repair wiring, connectors, or grounds as needed
- 4
Replace the failed part if testing confirms it
- 5
Clear the code and retest
Need a deeper diagnosis?
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