P0892 TCM Power Relay Sense Circuit Intermittent

P0892 indicates an intermittent TCM power relay sense circuit fault. Relay feedback drops out or becomes implausible only at times.

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 clear intermittent power-sense codes without a loaded voltage and connector check; they often return under vibration.

Symptoms of P0892

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 P0892

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

Monitor relay command, output, and sense voltage while repeating heat, vibration, and cranking conditions from freeze-frame data.
Inspect relay socket tension, fuse-panel corrosion, TCM connector fit, and wiring that may open under movement.
Review communication dropouts, limp mode, or no-shift events that match the intermittent power relay feedback.

Related OBD-II codes

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