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P1812 Ford Code - 4-Wheel Drive Mode Select Circuit Failure

Quick Answer

The P1812 Ford diagnostic trouble code indicates a 4-Wheel Drive Mode Select Circuit Failure. Common causes include Faulty 4-wheel drive mode selector switch, Damaged wiring or connectors in the circuit, Defective transfer case motor. 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
P1812 Ford indicates 4-Wheel Drive Mode Select Circuit Failure.
Common causes
Common causes include Faulty 4-wheel drive mode selector switch, Damaged wiring or connectors in the circuit, Defective transfer case motor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1812 Ford Description

The P1812 Ford diagnostic trouble code indicates a 4-Wheel Drive Mode Select Circuit Failure. This means that there is an issue with the circuit that controls the selection of the vehicle's 4-wheel drive mode. In modern vehicles, the 4-wheel drive mode is crucial for providing traction and stability in various driving conditions, such as off-road terrain, slippery roads, or during towing. When this circuit fails, it can have a significant impact on the vehicle's performance and safety.

OBDII Code P1812 Ford - 4-Wheel Drive Mode Select Circuit Failure
P1812 Ford Code - 4-Wheel Drive Mode Select Circuit Failure

Common Causes of P1812 Ford

  1. Faulty 4-wheel drive mode selector switch
  2. Damaged wiring or connectors in the circuit
  3. Defective transfer case motor
  4. Failed 4-wheel drive control module
  5. Corrosion or water damage in the circuit components

Symptoms of P1812 Ford

  1. Dashboard warning lights related to the 4-wheel drive system
  2. Difficulty engaging or disengaging the 4-wheel drive mode
  3. Limited traction or stability on slippery surfaces
  4. Unusual noises coming from the drivetrain
  5. Vehicle getting stuck in a particular drive mode

How to Fix P1812 Ford

  1. Perform a comprehensive diagnostic scan to confirm the P1812 Ford code and identify the specific issue with the 4-wheel drive mode select circuit.
  2. Inspect the wiring, connectors, and components related to the 4-wheel drive system for any signs of damage or corrosion.
  3. Test the 4-wheel drive mode selector switch and transfer case motor for proper functionality.
  4. Replace any faulty components, such as the switch, motor, or control module, and repair any damaged wiring or connectors.
  5. Clear the diagnostic trouble codes, reset the system, and test the 4-wheel drive mode to ensure proper operation.

Cost to Fix P1812 Ford

The typical repair costs for addressing a P1812 Ford code related to a 4-Wheel Drive Mode Select Circuit Failure can range from $200 to $800, depending on the specific component that needs to be replaced and the labor involved. It's important to note that these costs can vary significantly based on the vehicle's make and model, as well as the location and rates of the auto repair shop. Additionally, the diagnosis time and labor rates can impact the overall cost, with rates typically ranging between $80 and $150 per hour. It's recommended to obtain a detailed quote from a local auto repair shop to determine the exact cost for resolving this issue.

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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 P1812 Ford Code

1. What are the common symptoms of OBDII code P1812 Ford (4-Wheel Drive Mode Select Circuit Failure)?

Symptoms may include difficulty shifting between 2-wheel drive and 4-wheel drive modes, the vehicle being stuck in a single mode, or the 4-wheel drive system not engaging properly.

2. What are the possible causes of OBDII code P1812 Ford?

Potential causes include a faulty 4-wheel drive mode selector switch, damaged wiring or connectors in the circuit, a malfunctioning transfer case control module, or a problem with the transfer case itself.

3. How is OBDII code P1812 Ford diagnosed?

Diagnosis typically involves using a scan tool to retrieve the trouble code, checking the circuitry and connections related to the 4-wheel drive mode select system, and performing tests to pinpoint the root cause of the failure.

4. Can driving with OBDII code P1812 Ford cause further damage to the vehicle?

Continued driving with this code may lead to issues with the 4-wheel drive system, potentially resulting in limited or complete loss of functionality. It is recommended to address the problem promptly to avoid further damage.

5. Is it safe to drive the vehicle with OBDII code P1812 Ford present?

While the vehicle may still be operable with this code, it is best to avoid using the 4-wheel drive system until the underlying issue is resolved to prevent potential safety hazards or further damage to components.

6. How can OBDII code P1812 Ford be repaired?

Repair options may involve replacing a faulty mode selector switch, repairing damaged wiring or connectors, resetting the transfer case control module, or addressing any other specific component causing the circuit failure.

7. Is it possible to reset OBDII code P1812 Ford without making any repairs?

Resetting the trouble code without addressing the underlying issue will likely result in the code reappearing once the problem is detected again. It is recommended to diagnose and repair the root cause of the code.

8. Can a DIY enthusiast fix OBDII code P1812 Ford at home?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair this code at home. However, complex electrical issues may require professional expertise.

9. How much does it typically cost to repair OBDII code P1812 Ford at a dealership or repair shop?

The cost of repairs can vary based on the specific cause of the code and labor rates in your area. It is advisable to obtain quotes from different service providers to compare prices before proceeding with the repair.

10. Will fixing OBDII code P1812 Ford improve the vehicle's overall performance?

Resolving this code should restore proper functionality to the 4-wheel drive system, ensuring smooth shifting between drive modes and maintaining optimal performance when engaging 4-wheel drive as needed.

Discuss the causes and fixes for P1812 Ford OBDII Code

Submit a New Comment

  • Code p1812 ,2005 ford explore ,while driving veh in all wheel drive ,it will go into 4×4low by it self

    Reply to Comment

  • The most likely cause of the problem is the Four Wheel Drive Switch.

    Reply to Comment