P0881TCM Power Input Signal Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The TCM power input codes watch the supply voltage of the gearbox module or of its solenoid supply. Without a proper supply all solenoids go dead and the gearbox falls back to its hydraulic emergency gear with maximum line pressure: a fixed gear, harsh engagement, no shifting. Ford's external gearbox modules check a window of 9 to 16 V; GM reports the same under P0562/P0563. P0881 means the supply is electrically within range but implausible, for example differing from the engine module's system voltage or dipping when the solenoids switch on. No maker publishes a strategy for it.
- What you may notice
- MIL on
- Occasional harsh shifts
- Limp mode possible
- Likely causes
- LikelyContact resistance in supply or ground, voltage drop under load
- PossibleAlternator or battery problem
- PossibleRelay with worn contacts
- RareInternal measurement of the module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.