Reverse Output Circuit
The P0813 code means the vehicle's onboard diagnostic system has detected: Reverse Output Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $30 - $400 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P0813?
- Check Engine Light illuminated
- Reverse lights do not turn on
- Backup camera and parking sensors inactive in reverse
- Other reverse-dependent systems may not function
What Causes P0813? (Most Likely First)
- Blown reverse light fuse Very High
- Faulty reverse light relay or output driver High
- Open or short in reverse output wiring Moderate
- TCM or body control module output failure Low
Can I Still Drive with P0813?
Short distances only. P0813 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is the difference between P0812 and P0813?
P0812 relates to the input circuit that tells the TCM reverse is selected. P0813 relates to the output circuit that the TCM uses to activate reverse lights and related systems.
Is it safe to drive without reverse lights?
Driving without reverse lights is illegal in most areas and is a safety hazard. Other drivers cannot see when you are backing up, especially at night.
Could a simple blown fuse cause P0813?
Yes, a blown fuse is the most common and least expensive cause. Always check the fuse box first before pursuing more complex diagnostics.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0813?
-
Check the reverse light fuse and replace if blown
-
Test for voltage at the reverse light connector when in reverse
-
Inspect wiring from TCM or BCM to reverse light circuit
-
Use a scan tool to command the reverse output and verify operation
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0813?
- 2008-2018 Chevrolet Cruze
- 2010-2020 Honda Civic
- 2007-2017 Toyota Camry
- 2012-2019 Hyundai Elantra
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.