P0812 OBD Error Code: Problem & Solutions

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When the Powertrain control module of your vehicle is able to detect a problem with the reverse input circuit it will set this code. While driving the car, when the driver puts the vehicle in reverse gear it does so using the shifter, which is energised to carry out the command. The role of the PCM is to ensure that the voltage passing from this switch is well within the range set by the manufacturer.

Through the Reverse Input Sensor, the PCM comes to know that the transmission has been set into reverse. When the Powertrain Control Module detects any suspicious signal from the Reverse Input Sensor it will set code P0812.

What causes this problem with the Reverse Input Circuit?

• Defect in the reverse input switch
• Shorted or open wires which facilitate the reverse input switch
• Wiring is damaged
• Powertrain Control Module malfunctioning, although very rare

1. Reverse Input Switch - This is usually the culprit behind P0812 trouble code, simply repair or replace it and get rid of the code.
2. Powertrain Control Module - Fix your P0812 error if you have found a fault with the PCM by simple replacing it with Parts Avatar. We provide a large variety of branded auto parts to match your vehicle's specifications. Simply order online today!
3. Reverse Input Circuit - You can try to repair and resolve the code, if that’s not helping, opt for replacement.

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Willing to know some common symptoms of OBD Code P0812? Your wish is our demand. Have a look at them below:

Common Symptoms

• When this code is set, you will also find the ‘check engine’ light illuminating as well.
• In some vehicles this doesn’t happen until the error is detected two to three times at-least.
• The backup lamps may also stop working.

We have listed out some ways which would help you to correct the occurrence of OBD Code P0812. They are mentioned here as follows:

• Replace the reverse input switch
• Repair or replace the damaged or corroded wiring and/or connectors

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

You will need certain tools for the diagnosis of the P0812 trouble code, so get hold of a diagnostic scanner, a DVOM, vehicle information source. From the vehicle information source search for the Technical Service Bulletins matching your vehicles year, make, model, engine as well as symptoms and error code. If you’re able to find them in the TSB you will get plenty help in resolving this error.

Now connect the scanner to your vehicle's diagnostic port and retrieve all the codes present, remember to freeze frame the data and also make note of the codes in their order of appearance This will serve as a reference point if the code turns out to be intermittent. Now, safely clear all the codes and take your vehicle on a test drive and see if the code returns or if the PCM module enters readiness mode. If the latter occurs, then you have an intermittent issue, which may have to worsen before accurate diagnosis can be made, this is rather unfortunate, but intermittent conditions are difficult to diagnose.

If you find that the code immediately resets, then it’s time to check the TSB for flow-charts, connector pinout charts, connector face views and testing procedures of components. Using the DVOM test the voltage, ground and signal present at the reverse position sensor or neutral safety switch. The reverse position sensor input and output circuits will typically possess either reference voltage (transmission in reverse) or a ground (transmission not in reverse). Upon testing if you’re able to positively conclude that the all the system circuits are good, then you will have to use the DVOM and test the reverse position sensor. The sensors not in congruence with that of the manufacturer's specifications will have to be repaired or replaced. The codes related to reverse position sensors usually stem from a failed sensor.

Common Mistakes When Diagnosing the P0812 Code

• Since the backup lamps may not work in this error, the mechanic may wrongly start assuming an issue with the lamp bulbs instead of checking for faults present in the reverse input switch of poor connectors

P0813 - Reverse Output Circuit