P0884: TCM Power Input Signal Intermittent

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. P0884 reports a brief loss of supply. Chrysler calls it 'power up at speed': the module notices on start-up that the vehicle is already moving, so it must have rebooted while driving. In field reports from NHTSA investigation PE07-027 on 2007 Jeeps it was stored after engine stalls, among others from an unlatched fuse box connector.

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

Gearbox jerks or briefly enters limp mode while driving
Engine may stall with a combined powertrain module
Warning lamps flicker

Most likely causes

Loose or unlatched connector at fuse box or module
Ignition switch or relay with contact dropouts
Battery terminal or ground loose
Internal module reset

What to check, in order

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

Check the battery and grounds
Gently move the wiring with the engine running and watch whether the reading changes.
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 P0884 means

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

Frequently asked questions

Can I keep driving with code P0884?

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 P0884?

The most common causes are: loose or unlatched connector at fuse box or module; ignition switch or relay with contact dropouts; battery terminal or ground loose.

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.