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Engine-Codes – Generic – P1851

P1851 Code - Brake Band Apply Solenoid Performance

Quick Answer

The P1851 code refers to an issue with the brake band apply solenoid performance in a vehicle's transmission system. Common causes include Faulty brake band apply solenoid, Electrical issues with the solenoid circuit, Low transmission fluid levels. 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
P1851 indicates Brake Band Apply Solenoid Performance.
Common causes
Common causes include Faulty brake band apply solenoid, Electrical issues with the solenoid circuit, Low transmission fluid levels.
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 08, 2024
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Code P1851 Description

The P1851 code refers to an issue with the brake band apply solenoid performance in a vehicle's transmission system. The brake band apply solenoid is responsible for controlling the application of the brake band, which is a vital component in the transmission that helps facilitate gear changes. When this solenoid is not functioning properly, it can lead to issues with shifting gears, transmission slipping, or even complete transmission failure.

OBDII Code P1851 - Brake Band Apply Solenoid Performance
P1851 Code - Brake Band Apply Solenoid Performance

Common Causes of P1851

  1. Faulty brake band apply solenoid
  2. Electrical issues with the solenoid circuit
  3. Low transmission fluid levels
  4. Mechanical issues within the transmission
  5. Software or programming issues

Symptoms of P1851

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Inability to shift gears
  4. Transmission not engaging properly
  5. Check Engine Light illuminated

How to Fix P1851

  1. Diagnose the issue by connecting a diagnostic scanner to retrieve the fault codes and perform a thorough inspection of the brake band apply solenoid.
  2. Check the transmission fluid level and condition, topping up or replacing as necessary.
  3. Test the solenoid circuit for any electrical faults and repair or replace any damaged wiring.
  4. Replace the brake band apply solenoid if it is found to be faulty.
  5. Clear the fault codes, test drive the vehicle to ensure proper operation, and recheck for any remaining issues.

Cost to Fix P1851

The cost of repairing a P1851 code related to the brake band apply solenoid performance can vary depending on the specific vehicle make and model, the extent of the issue, and the labor rates in your area. On average, you can expect to pay between $200 to $500 for parts and labor. Keep in mind that diagnosis time and labor rates at auto repair shops can vary, so it's best to get quotes from local shops for a more accurate estimate.

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Code P1851 Information for Specific Makes

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 P1851 Code

1. What does the OBDII code P1851 mean?

P1851 indicates an issue with the Brake Band Apply Solenoid's performance, typically related to an automatic transmission's ability to engage or disengage specific gears properly.

2. What are the common symptoms of code P1851?

Symptoms may include harsh shifting, slipping gears, erratic transmission behavior, or the activation of the Check Engine Light.

3. What causes the P1851 code to appear?

Common causes include a faulty brake band apply solenoid, damaged wiring or connectors, low transmission fluid, or internal transmission issues.

4. Can low transmission fluid cause the P1851 code?

Yes, low or contaminated transmission fluid can impact solenoid performance and trigger the P1851 code.

5. How is the P1851 code diagnosed?

A mechanic may use a scan tool to confirm the code, inspect the solenoid and wiring for damage, and check the condition and level of the transmission fluid.

6. Can I drive with the P1851 code?

Driving with this code is not recommended, as it can lead to further transmission damage and unsafe driving conditions.

7. How do I fix the P1851 code?

Repairs may involve replacing the brake band apply solenoid, repairing damaged wiring or connectors, or addressing internal transmission issues.

8. How much does it cost to fix the P1851 code?

Repair costs vary depending on the specific issue but can range from $150 for solenoid replacement to over $1,000 for internal transmission repairs.

9. Can a faulty TCM cause the P1851 code?

Yes, a malfunctioning Transmission Control Module (TCM) can lead to solenoid performance issues and trigger this code.

10. How can I prevent the P1851 code from recurring?

Regular transmission fluid maintenance, timely repairs, and addressing any transmission warning signs promptly can help prevent this code from recurring.

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