Powertrain, generic · Transmission

P0880 TCM Power Input Signal

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

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. P0880 is the general fault. Hyundai's 2017–19 six-speed automatics set it when the solenoid supply drops below 7 V or rises above 22 V: MIL on, limp mode in 4th gear. Hyundai's bulletin points to the valve body harness and the TCU fuses and expressly not to the gearbox.

Likely causes

Harness or connector between module and valve body damaged or corroded

TCU fuse or transmission relay faulty

Weak battery, charging fault, poor ground

Gearbox module faulty

Symptoms

MIL on
Limp mode in a fixed gear, no shifting
Harsh engagement into D or R

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–600

Time0.5–3 h

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

Parts involved

transmission control moduletransmission relaybatterymodule wiring

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