Code status
Needs verification
Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.
- System
- Transmission
- 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 chase shift-solenoid faults first if TCM power is low; module supply voltage must be stable before diagnosis.
Useful checks before replacing parts
- Check battery condition, alternator output, TCM fuse, power relay, grounds, and voltage drop at the TCM connector.
- Compare scan-tool TCM voltage with measured voltage during cranking, idle, and electrical load.
- Inspect relay sockets, corroded terminals, water intrusion, and wiring damage that can lower module supply voltage.
Related OBD-II codes
These nearby transmission entries can help compare wording and fault area. They may share the same verification status as the source database.