P0883: TCM Power Input Signal High

What does P0883 mean?

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. P0883 means the supply is too high: Ford sets it above 16 V, continuously and with MIL; GM's counterpart P0563 sets at 18 V. Typical triggers are a failed alternator regulator or a jump start with 24 V. Overvoltage endangers the output stages, so the module may switch the solenoids off.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• MIL on
• Charging warning or unusually bright lights
• Overvoltage codes in other modules

Common causes

• High Alternator voltage regulator faulty (overcharging)
• Medium Jump start with 24 V or charger in boost mode
• Medium Poor battery ground, regulator measures wrongly
• Low Module measurement faulty

Likelihood is a general estimate across vehicles; your make and model may differ.