AutoCodes – Acura – P0812 Acura

P0812 Acura Code - Reverse Input Circuit

Quick Answer

The Transmission Control Module (TCM) monitors the Reverse Switch Input signal. Common causes include Faulty Transmission Range Switch, Transmission Range Switch harness is open or shorted, Transmission Range Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0812 Acura indicates Reverse Input Circuit.
Common causes: Common causes include Faulty Transmission Range Switch, Transmission Range Switch harness is open or shorted, Transmission Range Switch circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 6,170

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0812 Acura Description

The Transmission Control Module (TCM) monitors the Reverse Switch Input signal. The TCM sets the OBDII code when the Reverse Switch Input is not to factory specifications.

OBDII Code P0812 Acura - Reverse Input Circuit - AutoCodes.com — P0812 Acura Code - Reverse Input Circuit

What does this mean?

What are the Possible Causes of the DTC P0812 Acura?

Faulty Transmission Range Switch
Transmission Range Switch harness is open or shorted
Transmission Range Switch circuit poor electrical connection

How to Fix the DTC P0812 Acura?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0812 Acura code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.