P0883: TCM Power Input Signal High

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.

Medium severity. Can I keep driving?It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

Symptoms

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

Most likely causes

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

What to check, in order

Start with the simplest. You can tick off each step.

Check the battery and grounds
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Clear the code and see if it returns
If it is a reference voltage code, disconnect sensors one at a time and see if the voltage recovers
Check whether a software update is available
Do not replace the control module without a full diagnosis

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P0883 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
8: Transmission
83: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0883?

It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.

What causes code P0883?

The most common causes are: alternator voltage regulator faulty (overcharging); jump start with 24 V or charger in boost mode; poor battery ground, regulator measures wrongly.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.