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Engine-Codes – Generic – B1627

B1627 Code - PRNDL Reverse Input Circuit Failure

Quick Answer

The B1627 diagnostic trouble code indicates a failure in the PRNDL (Park/Reverse/Neutral/Drive/Low) reverse input circuit. Common causes include Faulty reverse light switch, Damaged wiring or connectors in the PRNDL circuit, Defective transmission control module (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
B1627 indicates PRNDL Reverse Input Circuit Failure.
Common causes
Common causes include Faulty reverse light switch, Damaged wiring or connectors in the PRNDL circuit, Defective transmission control module (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 06, 2024
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Code B1627 Description

The B1627 diagnostic trouble code indicates a failure in the PRNDL (Park/Reverse/Neutral/Drive/Low) reverse input circuit. This circuit is responsible for sending signals from the gear shift lever to the vehicle's transmission control module (TCM) to indicate that the vehicle is in reverse gear. When this circuit fails, it can lead to issues with the transmission shifting correctly, potentially causing the vehicle to not engage reverse gear or experience erratic shifting behavior.

OBDII Code B1627 - PRNDL Reverse Input Circuit Failure
B1627 Code - PRNDL Reverse Input Circuit Failure

Common Causes of B1627

  1. Faulty reverse light switch
  2. Damaged wiring or connectors in the PRNDL circuit
  3. Defective transmission control module (TCM)
  4. Corrosion or moisture in the circuit
  5. Mechanical issue with the transmission linkage

Symptoms of B1627

  1. Inability to shift into reverse gear
  2. Delayed engagement when shifting into reverse
  3. Incorrect gear indicator display on the dashboard
  4. Transmission slipping or jerking
  5. Check Engine Light illuminated

How to Fix B1627

  1. Begin by conducting a thorough inspection of the reverse light switch, wiring, and connectors for any visible damage or corrosion.
  2. Test the reverse light switch using a multimeter to check for continuity and proper functionality.
  3. Inspect the transmission control module (TCM) for any signs of damage or malfunction and replace if necessary.
  4. Clean any corroded connections in the PRNDL circuit and ensure a secure connection.
  5. Test drive the vehicle to verify that the issue has been resolved and that the transmission is shifting correctly.

Cost to Fix B1627

The typical repair costs for addressing a PRNDL reverse input circuit failure can vary depending on the root cause of the issue. In general, the cost of parts and labor for this repair can range from $150 to $500. However, it is important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to obtain quotes from local repair shops for a more accurate estimate.

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Code B1627 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 B1627 Code

1. What are the common symptoms of OBDII code B1627 (PRNDL Reverse Input Circuit Failure)?

Symptoms may include the inability to shift into reverse gear, incorrect gear selection display on the dashboard, and issues with the vehicle's starting system.

2. What are the possible causes of OBDII code B1627?

Potential causes include a faulty reverse input circuit, damaged wiring or connectors in the PRNDL (gear selector) system, issues with the transmission control module, or a malfunctioning gear position sensor.

3. How can I diagnose the PRNDL Reverse Input Circuit Failure?

Diagnosis typically involves using a scan tool to retrieve the OBDII code B1627, conducting a visual inspection of the wiring and connectors in the PRNDL system, and testing the gear position sensor and related components for proper operation.

4. Can I continue driving my vehicle with OBDII code B1627 present?

It is not recommended to drive the vehicle with this code, as it can lead to safety issues such as incorrect gear selection and potential transmission problems. It is best to address the issue promptly.

5. How can I repair OBDII code B1627?

Repair options may include repairing or replacing damaged wiring and connectors, replacing the gear position sensor, resetting the transmission control module, or seeking assistance from a professional mechanic for further diagnosis and repair.

6. Is OBDII code B1627 a serious issue?

While the severity of the issue may vary, it is important to address OBDII code B1627 promptly to prevent potential transmission problems and ensure safe operation of the vehicle.

7. Can a DIY enthusiast fix OBDII code B1627 at home?

Depending on the underlying cause of the code, some DIY enthusiasts with automotive repair experience may be able to diagnose and repair OBDII code B1627 at home. However, it is recommended to have the necessary tools and knowledge to work on transmission-related components.

8. How much does it cost to repair OBDII code B1627?

The cost of repairing OBDII code B1627 can vary depending on the cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to obtain quotes from multiple mechanics to compare prices.

9. Can resetting the OBDII system clear the B1627 code?

Resetting the OBDII system may temporarily clear the B1627 code, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

10. How long does it take to repair OBDII code B1627?

The repair time for OBDII code B1627 can vary depending on the specific cause of the issue, the availability of parts, and the expertise of the mechanic. In some cases, the repair can be completed within a few hours, while more complex issues may take longer to resolve.

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