P0813 OBD-II Trouble Code: Reverse Output Circuit Malfunction

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0813 code

P0813 is a diagnostic trouble code (DTC) for "Reverse Output Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0813 DIAGNOSTIC Get a fair and transparent estimate upfront

P0813 code definition

P0813 is the fault code for the Reverse Output Circuit.

What the P0813 code means

This is the generic OBD-II fault code indicating an issue within the reverse output circuit. When you shift your vehicle into reverse, the PCM (powertrain control module) monitors the voltage signal sent from the reverse input switch. If the PCM detects a signal outside of the expected range, the P0813 will set, indicating a malfunction somewhere within the circuit.

What causes the P0813 code?

A few things may trigger this code to be stored in the vehicle’s computer:

  • A defective reverse input switch (the most common cause)
  • A short or open in the wiring and/or connectors associated with the reverse input switch
  • Very rarely, a faulty PCM

What are the symptoms of the P0813 code?

A problem in the reverse output circuit may cause the Check Engine light to illuminate. In addition to the CEL and the stored trouble code, the back-up lamps may fail to work.

How does a mechanic diagnose the P0813 code?

Steps that your technician may carry out in order to diagnose code P0813 include:

  • Hooking the vehicle up to an OBD-II scanner in order to verify the stored code and check for any other trouble codes that may be present
  • Recording the information on these codes, such as the time, frequency, and order in which they occurred, and capturing the freeze frame data
  • Diagnosing and repairing any other issues that occurred prior to the reverse output circuit malfunction
  • Clearing the data from the vehicle’s computer and retesting the vehicle to make sure the same code returns
  • Performing a visual inspection of the wiring and connectors to check for corrosion or loose connections
  • Checking for voltage on the switch’s input side
  • Checking for continuity between the fuse and the reverse input switches input circuit
  • With the vehicle in reverse, checking for voltage on the output side of the switch
  • Checking continuity and resistance between the reverse input switch and the PCM

Related control modules should be disconnected from the PCM before testing the circuitry. Disconnecting any related control modules can prevent damage to these expensive components and having to reprogram the vehicle’s computer.

Common mistakes when diagnosing the P0813 code

If this fault has caused back-up lamp failure, people will often assumed the back-up lamp bulbs are to blame, when in fact there is a short in the wiring, bad connectors, or a defective reverse input switch.

How serious is the P0813 code?

While not as serious as other codes which affect the vehicle’s ability to run, this code should be addressed in a timely manner due to the possibility of back-up lamp failure. Driving without back-up lamps could cause a dangerous situation if other drivers can’t tell that you’re backing up.

What repairs can fix the P0813 code?

Repairing a faulty reverse output circuit may involve one or more of the following:

Additional comments for consideration regarding the P0813 code

The manufacturer’s wiring diagram specific to your vehicle should be used to ensure that all of the correct circuits are tested. On vehicles with automatic transmissions, the reverse input switch is often part of a manual lever position sensor or neutral safety switch. On vehicles with a manual transmission, the switch may be threaded onto the transmission housing near the gear shifter. This diagnosis may involve testing with a code reader and a digital volt/ohmmeter. When considering whether the attempt the repair on your own, keep in mind that your professional mechanic has tools that provide more detailed information than those designed for driveway use. If you have any doubts about how to fix a P0813 code, consult your qualified professional.

Need help with a P0813 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
P0813
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0813 code.

SCHEDULE P0813 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

P0340 OBD-II Trouble Code: Camshaft Position Sensor Circuit Malfunction
P0340 code definition Camshaft Position Sensor Circuit Malfunction What the P0340 code means The camshaft position sensor calculates the rotational speed of...
B1363 OBD-II Trouble Code: Ignition Start Circuit Failure
B1363 means there is an error with the ignition start circuit, likely due to a defective ignition switch, faulty motor or solenoid, or dead battery.
P2504 OBD-II Trouble Code: Charging System Voltage High
P2504 P2504 code definition The P2504 OBD-II fault code simply means that an irregularity was detected in the charging system circuit - specifically that the voltage was high. This high voltage reading may have originated from the battery, charging system,...

Related questions

P1810 Pressure Manifold Fault

If you have code P1810, then this might be something wrong with the transmission control valve for the gear position sensor, or a compatibility problem between the different computers. Have a pinpoint test for the code done and see if...

My truck turns over but won't start.

When a truck won't start, it's usually going to be an ignition or fuel system-related malfunction. The fact that your gas gauge was "ticking" a bit may be an indicator that an electrical problem exists, causing the ignition system to...

I have the check engine light on and checked for DTC's it says ECM set and CEM set

Hi there, thanks for writing in about your Volvo. There should be specific alpha numeric "codes" displayed on the Code Reader. Do you see/have those "codes"? These will help pinpoint any faults and assess the issue. I would recommend having...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com