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Autopart Mechanic

Autopa ... 6/16/2018

2016 Honda CR-V EX 4 Cyl 2.40L


What Does P0812 OBD-II Trouble Code mean? What are the causes and symptoms of Reverse Input Circuit of my car?

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PartsAvatar Ca

PartsAvatar Ca 6/16/2018

What the P0812 code means?

This code is triggered when the PCM (Power train Control Module) has discovered a problem with the
reverse input circuit. When the driver puts their vehicle in reverse, they do so by using the shifter, which is
then energized. The PCM monitors this process to ensure the voltage from this switch falls within an
acceptable range predetermined by the manufacturer.

What causes the P0812 code?

Faulty Reverse Input Switch

Reverse Input Switch harness is open or shorted

Reverse Input Switch circuit poor electrical connection

Damaged PCM

What are the symptoms of the P0812 code?

Symptoms may include failure of the back-up lamps to illuminate, a stored code, and possibly an
illuminated service engine soon lamp.

Common mistakes when diagnosing the P0812 code:

Technicians report that the back-up lamp bulbs are frequently condemned in error when the reverse input
switch, wiring, or connectors are at fault.

How serious is the P0812 code?

There is nothing inherently dangerous about the P0812 code. That being said, if it results in the backup
lamps burning out, the driver will need to get around with them. That can be dangerous as other drivers
won't have forewarning when the automobile is backing up. Getting caught with this problem could earn the
owner a ticket, too, one that will probably cost a lot more than just going in for repairs.

What repairs can fix the P0812 code?

Replacing the reverse input switch

Repairing or replacing faulty or corroded connectors or wiring.


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