Engine-Codes.com
Engine-Codes – Generic – P27AB

P27AB Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

Quick Answer

The diagnostic trouble code (DTC) P27AB indicates that the Transmission Control Solenoid Valve 5 Calibration is Incorrect. Common causes include Faulty solenoid valve 5, Wiring issues or poor electrical connections, Transmission fluid contamination. 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
P27AB indicates Transmission Control Solenoid Valve 5 Calibration Incorrect.
Common causes
Common causes include Faulty solenoid valve 5, Wiring issues or poor electrical connections, Transmission fluid contamination.
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 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P27AB Description

The diagnostic trouble code (DTC) P27AB indicates that the Transmission Control Solenoid Valve 5 Calibration is Incorrect. This code typically occurs when the transmission control module (TCM) detects that the calibration of the solenoid valve 5 is not within the expected range. The solenoid valves in a vehicle's transmission are responsible for regulating the flow of transmission fluid to different components, such as clutches and gearshift actuators, to control gear shifting and overall transmission operation.

OBDII Code P27AB - Transmission Control Solenoid Valve 5 Calibration Incorrect
P27AB Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

Common Causes of P27AB

  1. Faulty solenoid valve 5
  2. Wiring issues or poor electrical connections
  3. Transmission fluid contamination
  4. TCM software issues
  5. Mechanical issues within the transmission system

Symptoms of P27AB

  1. Erratic shifting patterns
  2. Harsh shifts
  3. Delayed engagement
  4. Transmission slipping
  5. Check Engine Light illuminated

How to Fix P27AB

  1. Diagnose the issue by using a scan tool to retrieve the DTC and check the calibration of solenoid valve 5.
  2. Inspect the solenoid valve 5 and its wiring for any visible damage or corrosion.
  3. Test the solenoid valve 5 for proper operation and replace it if necessary.
  4. Check and clean electrical connections related to the solenoid valve 5.
  5. Perform a transmission fluid flush and refill if contamination is suspected, and reprogram the TCM if needed.

Cost to Fix P27AB

The cost of repairing a Transmission Control Solenoid Valve 5 Calibration Incorrect issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, the cost of replacing a solenoid valve can range from $150 to $300, including parts and labor. Additional costs may apply if other components need to be replaced or if the TCM requires reprogramming. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

Need more information about the P27AB code?

Need more information on how to fix the P27AB code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27AB code diagnosed by a professional: Find a repair shop in your area

Code P27AB Information for Specific Makes

  • P27AB Buick — Transmission Control Solenoid Valve 5 Calibration Incorrect
  • P27AB Cadillac — Transmission Control Solenoid Valve 5 Calibration Incorrect
  • P27AB Chevrolet — Transmission Control Solenoid Valve 5 Calibration Incorrect
  • P27AB GMC — Transmission Control Solenoid Valve 5 Calibration Incorrect
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 P27AB Code

1. What are the common symptoms of OBDII code P27AB?

- Common symptoms of P27AB include transmission shifting issues, harsh shifting, slipping, and decreased fuel efficiency.

2. What can cause the Transmission Control Solenoid Valve 5 Calibration Incorrect code (P27AB) to trigger?

- The P27AB code can be triggered by a faulty transmission control solenoid valve, wiring issues, or a software calibration error.

3. How can I diagnose the cause of OBDII code P27AB?

- To diagnose P27AB, you can perform a visual inspection of the transmission control solenoid valve and its wiring, conduct a transmission fluid check, and use an OBDII scanner for further diagnosis.

4. Can I continue driving my vehicle with the P27AB code present?

- It is not recommended to drive your vehicle with the P27AB code present, as it can lead to further damage to the transmission and potentially unsafe driving conditions.

5. How do I repair OBDII code P27AB?

- To repair P27AB, you may need to replace the transmission control solenoid valve, repair any wiring issues, and perform a software calibration reset using a professional OBDII scanner.

6. Are there any DIY tips for fixing the P27AB code?

- While some basic inspections can be done DIY, it is recommended to seek professional help for repairing the P27AB code to ensure proper diagnosis and repair.

7. Can a software update fix the P27AB code?

- In some cases, a software update may resolve the P27AB code if it was triggered by a calibration error. Consult with a professional mechanic or dealership for software updates.

8. How much does it typically cost to fix OBDII code P27AB?

- The cost to fix P27AB can vary depending on the root cause of the issue, but it may involve parts replacement and labor costs, ranging from a few hundred to over a thousand dollars.

9. Is it safe to clear the P27AB code using an OBDII scanner?

- Clearing the P27AB code using an OBDII scanner may temporarily remove the warning light, but it is important to address the underlying issue causing the code to prevent further damage.

10. How often does the Transmission Control Solenoid Valve 5 Calibration Incorrect code (P27AB) occur in vehicles?

- The P27AB code is relatively uncommon but can occur in vehicles with transmission control solenoid valve or calibration issues. Regular maintenance can help prevent such issues.

Discuss the causes and fixes for P27AB OBDII Code

Submit a New Comment

Code P27AB comments

No comments found for this page.