P0813 - Reverse Output Circuit

The controller detected an invalid transmission range or start-enable input, which can come from a switch fault, adjustment problem, or circuit issue.

Code Overview

The controller detected an invalid transmission range or start-enable input, which can come from a switch fault, adjustment problem, or circuit issue.

Common Causes

• Misadjusted or failed range switch
• Damaged wiring or corroded connector
• Shifter linkage issue
• Control-module input fault

Diagnostic Steps

1. Confirm the range switch or linkage is adjusted correctly
2. Inspect connectors for corrosion or water intrusion
3. Verify the PCM or TCM sees the correct range input
4. Check related start-enable and reverse-lamp circuits

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.