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Engine-Codes – Generic – P187B

P187B Code - Gear Block 6th

Quick Answer

The P187B code indicates a problem with Gear Block 6th in the vehicle's transmission system. Common causes include Worn gears in the transmission, Faulty solenoids or sensors, Malfunctioning TCM. 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
P187B indicates Gear Block 6th.
Common causes
Common causes include Worn gears in the transmission, Faulty solenoids or sensors, Malfunctioning TCM.
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 11, 2024
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Code P187B Description

The P187B code indicates a problem with Gear Block 6th in the vehicle's transmission system. This code typically points to an issue with the gear ratio in the 6th gear. The transmission control module (TCM) monitors the gear ratios to ensure smooth shifting and efficient performance. When the TCM detects that the gear ratio in the 6th gear is outside the expected parameters, it triggers the P187B code and illuminates the check engine light.

OBDII Code P187B - Gear Block 6th
P187B Code - Gear Block 6th

Common Causes of P187B

  1. Worn gears in the transmission
  2. Faulty solenoids or sensors
  3. Malfunctioning TCM
  4. Electrical wiring issues
  5. Low transmission fluid level

Symptoms of P187B

  1. Harsh shifting when trying to engage 6th gear
  2. Slipping or hesitation in 6th gear
  3. Decreased fuel efficiency
  4. Check engine light illuminated
  5. Reduced power output

How to Fix P187B

  1. Diagnose the issue by using a scan tool to retrieve the fault codes and examining the transmission system for any visible damage.
  2. Check the transmission fluid level and quality. Top up or replace the fluid if necessary.
  3. Inspect the transmission components, such as gears, solenoids, and sensors, for wear or damage. Replace any faulty parts.
  4. Test drive the vehicle after repairs to ensure that the issue has been resolved and the gear ratio in 6th gear is within the expected parameters.
  5. Clear the fault codes and reset the TCM to turn off the check engine light.

Cost to Fix P187B

The cost of repairing a P187B code can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the repair costs for this issue can range from $200 to $600, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on factors such as the vehicle make and model, the location of the repair shop, and the hourly labor rates. It's recommended to get a detailed quote from a certified mechanic to determine the precise cost of addressing the Gear Block 6th issue.

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Code P187B 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 P187B Code

1. What does the OBDII code P187B mean?

P187B indicates an issue with the transmission system, specifically the inability to engage or maintain 6th gear, often referred to as "Gear Block 6th."

2. What are common symptoms of the P187B code?

Symptoms may include difficulty shifting into 6th gear, the transmission slipping, reduced fuel efficiency, and the check engine light being illuminated.

3. What causes the P187B code to appear?

Common causes include a faulty transmission solenoid, low or degraded transmission fluid, mechanical wear in the transmission, or issues with the transmission control module (TCM).

4. Can I still drive my car with the P187B code?

Driving may be possible, but it is not recommended as ignoring the issue can lead to further damage to the transmission and reduced performance.

5. How is the P187B code diagnosed?

A mechanic will typically use a scan tool to confirm the code, inspect the transmission fluid, test the solenoids, and check for any internal mechanical damage.

6. What are common fixes for the P187B code?

Repairs can include replacing the transmission solenoid, flushing and refilling the transmission fluid, reprogramming or replacing the TCM, or addressing internal transmission damage.

7. How much does it cost to fix the P187B code?

Repair costs can range from $150 for a solenoid replacement to over $2,000 for internal transmission repairs, depending on the severity of the issue.

8. Can low transmission fluid cause the P187B code?

Yes, low or degraded transmission fluid can prevent proper hydraulic pressure, leading to difficulty engaging 6th gear and triggering this code.

9. Will resetting the check engine light fix the P187B code?

Resetting the light without addressing the underlying issue will not resolve the problem, and the code is likely to return.

10. Can a bad TCM cause the P187B code?

Yes, a malfunctioning transmission control module can result in improper gear engagement, including issues with 6th gear.

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