The P0889 trouble code indicates an issue with the Transmission Control Module (TCM) power relay sense circuit
P0889 TCM Power Relay Sense Circuit Range/Performance
Code symptoms P0889.
1. Illumination of the Check Engine Light (CEL) on the dashboard.
2. Possible transmission shifting issues.
3. Vehicle may go into “limp mode,” reducing performance.
4. Other related trouble codes may be present.
Causes of the code P0889.
1. Faulty Transmission Control Module (TCM) power relay.
2. Wiring or connector issues in the power relay sense circuit.
3. Poor electrical connection or corrosion in the relay or circuit connector.
4. Problems with the transmission control module (TCM).
5. Internal transmission issues affecting power relay function.
Code Solutions P0889.
1. Inspect and replace the Transmission Control Module (TCM) power relay if it’s faulty.
2. Check and repair any damaged wiring or connectors in the power relay sense circuit.
3. Ensure good electrical connections and clean any corrosion from connectors.
4. If the issue persists, further diagnostics may be necessary to identify internal transmission problems.
5. Clear the trouble codes from the vehicle’s computer after repairs are complete.
6. Test drive the vehicle to confirm that the issue has been resolved.