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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.
P0813 is the fault code for the Reverse Output Circuit.
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.
A few things may trigger this code to be stored in the vehicle’s computer:
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.
Steps that your technician may carry out in order to diagnose code P0813 include:
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.
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.
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.
Repairing a faulty reverse output circuit may involve one or more of the following:
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.
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