Error code

OBD2 P0890

OBD2P0890
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

TCM Power Relay Sense Circuit Low.

Severity

moderateCan drive but transmission may be in 'limp mode' and gear shifts are restricted.

Summary

P0890 indicates a low voltage issue in the power relay sense circuit of the transmission control module (TCM), which can prevent proper gear shifting.

Symptoms

  • Stored trouble code and illuminated warning light
  • Transmission held in failsafe or 'limp mode'
  • Additional codes related to system voltages may be present

Common Causes

  • Damaged, shorted, disconnected, or corroded wiring causing open circuits
  • Low battery voltage
  • Defective shift solenoid control relay
  • Failed or failing PCM/TCM (rare)

Diagnosis

  1. Check battery voltage and condition, clean terminals if necessary.
  2. Inspect relay input circuit for continuity and resistance issues.
  3. Test shift solenoid control relay for proper function.
  4. If intermittent fault is suspected, repeat tests until issue is found or seek professional help.

Fixes

  • Replace damaged wiring or corroded connectors
  • Check and clean battery terminals
  • Replace defective shift solenoid control relay

FAQ

What should I do if my car's transmission is in 'limp mode'?

Check the battery voltage and condition, inspect wiring for issues, and test the shift solenoid control relay. If unsure, seek professional help.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

More OBD2 codes

All OBD2 codes →Search more codes →