Code status
Needs verification
Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.
- System
- Fuel / Air
- Scope
- iso-sae-controlled-p0
- Standard
- SAE J2012 / ISO 15031-6
- Source
- legacy-import
Diagnostic boundary
A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.
Do not assume a downstream sensor signal problem is the root cause; this code is specifically about heater-control behavior.
Useful checks before replacing parts
- Check for open heater wiring, short-to-voltage, weak ground, poor connector contact, or sensor heater resistance out of range.
- Inspect harness routing around the exhaust and underbody where heat and road debris can damage wiring.
- Confirm whether other heater codes point to a common supply, fuse, relay, or ground problem.
Related OBD-II codes
These nearby fuel / air entries can help compare wording and fault area. They may share the same verification status as the source database.