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 diagnose overheating or cooling-fan behavior until the coolant temperature signal itself is proven accurate.
Useful checks before replacing parts
- Check coolant temperature live data against actual engine temperature and cold-soak ambient conditions.
- Inspect sensor wiring for short-to-ground, connector corrosion, coolant contamination, and damaged insulation.
- Review fan operation, enrichment behavior, and temperature gauge behavior to see whether the signal fault is affecting strategy.
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.