Powertrain, generic · Transmission

P0884 TCM Power Input Signal Intermittent

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modePossible

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.

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

Symptoms

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

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€0–500

Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

transmission control moduletransmission relaybatterymodule wiring

Related codes

P0882 P0883 P0880 P0892 P0700

References: static.nhtsa.gov, law.cornell.edu.