AutoCodes – Ford – P0812 2001 Ford F150

P0812 2001 Ford F150 Code - Reverse Switch Input Circuit Malfunction

Quick Answer

The Transmission Control Module (TCM) monitors the Reverse Switch Input signal. Common causes include Faulty Reverse Input Switch, Reverse Input Switch harness is open or shorted, Reverse Input 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 2001 Ford F150 indicates Reverse Switch Input Circuit Malfunction .
Common causes: Common causes include Faulty Reverse Input Switch, Reverse Input Switch harness is open or shorted, Reverse Input 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 2,314

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0812 2001 Ford F150 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 2001 Ford F150 - Reverse Switch Input Circuit Malfunction - AutoCodes.com — P0812 2001 Ford F150 Code - Reverse Switch Input Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0812 2001 Ford F150?

Faulty Reverse Input Switch
Reverse Input Switch harness is open or shorted
Reverse Input Switch circuit poor electrical connection
Damaged PCM

How to Fix the DTC P0812 2001 Ford F150?

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 does this mean?

Code Tech Notes

The DTC indicates that the voltage is high when it should be low.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0812 2001 Ford F150 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.

Need more information about the P0812 2001 Ford F150 code?

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Need Help with the Code?

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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.

Frequently Asked Questions about P0812 2001 Ford F150 Code

1. What are the common symptoms of OBDII code P0812 in a 2001 Ford F150?

- Common symptoms include the inability to shift into reverse gear, erratic shifting behavior, and illumination of the Check Engine Light.

2. What could cause the OBDII code P0812 to trigger in a 2001 Ford F150?

- The most common cause of P0812 is a malfunction in the reverse switch input circuit, which may be due to damaged wiring, a faulty switch, or a poor connection.

3. How do I diagnose the Reverse Switch Input Circuit Malfunction in my 2001 Ford F150?

- Diagnosing P0812 involves checking the reverse switch, inspecting the wiring for any damage, and testing the circuit for continuity and proper voltage.

4. Can I still drive my 2001 Ford F150 with the P0812 code present?

- It is not recommended to drive your vehicle with the P0812 code present, as it may lead to further transmission issues and potential safety hazards.

5. How can I repair the Reverse Switch Input Circuit Malfunction in my 2001 Ford F150?

- Repairing P0812 typically involves replacing the faulty reverse switch, repairing any damaged wiring, and ensuring all connections are secure and functioning properly.

6. Will resetting the OBDII code P0812 in my 2001 Ford F150 make the issue go away?

- Resetting the code may temporarily turn off the Check Engine Light, but it will not fix the underlying issue causing the P0812 code to trigger.

7. Is it possible for a DIY enthusiast to fix the P0812 code in a 2001 Ford F150?

- While some DIY enthusiasts may be able to diagnose and repair the P0812 code, it is recommended to seek professional help, especially when dealing with transmission-related issues.

8. Can extreme weather conditions affect the Reverse Switch Input Circuit in a 2001 Ford F150?

- Yes, extreme weather conditions such as excessive heat or moisture can potentially damage the wiring or switch, leading to a P0812 code trigger.

9. Are there any preventive measures to avoid the P0812 code in a 2001 Ford F150?

- Regularly inspecting the reverse switch and wiring for any signs of wear or damage, and addressing any issues promptly, can help prevent the occurrence of the P0812 code.

10. How long does it typically take to repair the Reverse Switch Input Circuit Malfunction in a 2001 Ford F150?

- The repair time for P0812 can vary depending on the extent of the damage and the availability of parts, but it may range from a few hours to a full day at a repair shop.