P0882 TCM Power Input Signal Low

P0882 indicates low TCM power input signal. The transmission controller sees power voltage below the expected level.

Code details

Generic OBD-II · P0

System: Transmission
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not chase shift-solenoid faults first if TCM power is low; module supply voltage must be stable before diagnosis.

Symptoms of P0882

Harsh, delayed, or slipping shifts, or being stuck in one gear.
Check-engine light, sometimes with limp-home mode.
Flaring RPM or a shudder under load.

Common causes of P0882

Low or degraded transmission fluid.
A failing speed sensor, shift solenoid, or pressure-control circuit.
Wiring, connector, or internal hydraulic/mechanical faults.

Useful checks before replacing parts

Check battery condition, alternator output, TCM fuse, power relay, grounds, and voltage drop at the TCM connector.
Compare scan-tool TCM voltage with measured voltage during cranking, idle, and electrical load.
Inspect relay sockets, corroded terminals, water intrusion, and wiring damage that can lower module supply voltage.

Related OBD-II codes

These nearby transmission entries can help compare wording and pin down the fault area.