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P27AB 2016 GMC Sierra Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

Quick Answer

The P27AB diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Transmission Control Solenoid Valve 5 Calibration is Incorrect. Common causes include Faulty transmission control solenoid valve 5, Wiring or connection issues between the solenoid valve and TCM, Corrosion or debris affecting the solenoid valve operation. 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 2016 GMC Sierra indicates Transmission Control Solenoid Valve 5 Calibration Incorrect.
Common causes
Common causes include Faulty transmission control solenoid valve 5, Wiring or connection issues between the solenoid valve and TCM, Corrosion or debris affecting the solenoid valve operation.
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 14, 2024
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Code P27AB 2016 GMC Sierra Description

The P27AB diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Transmission Control Solenoid Valve 5 Calibration is Incorrect. This code typically points to an issue with the transmission control module (TCM) not receiving the correct signal from solenoid valve 5, which is responsible for controlling the flow of transmission fluid within the transmission system. When the calibration of this solenoid valve is incorrect, it can lead to various transmission-related problems and affect the vehicle's overall performance.

OBDII Code P27AB 2016 GMC Sierra - Transmission Control Solenoid Valve 5 Calibration Incorrect
P27AB 2016 GMC Sierra Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

Common Causes of P27AB 2016 GMC Sierra

  1. Faulty transmission control solenoid valve 5
  2. Wiring or connection issues between the solenoid valve and TCM
  3. Corrosion or debris affecting the solenoid valve operation
  4. TCM software or calibration issues
  5. Electrical system issues affecting the transmission control module

Symptoms of P27AB 2016 GMC Sierra

  1. Erratic shifting or difficulty shifting gears
  2. Harsh or delayed shifting
  3. Transmission slipping
  4. Illumination of the Check Engine Light
  5. Reduced fuel efficiency

How to Fix P27AB 2016 GMC Sierra

  1. Diagnose the specific cause of the calibration issue with solenoid valve 5 using a scan tool to read the DTC and perform further testing if necessary.
  2. Inspect the wiring and connections related to solenoid valve 5 for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the solenoid valve 5 for proper operation and replace if it is found to be faulty.
  4. Update or reprogram the TCM software to correct any calibration issues.
  5. Clear the DTC and test drive the vehicle to ensure proper operation of the transmission system.

Cost to Fix P27AB 2016 GMC Sierra

The typical repair costs for addressing a P27AB code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the extent of repairs needed. In general, the cost of replacing a transmission control solenoid valve can range from $150 to $300, including parts and labor. However, additional costs may be incurred if wiring repairs or TCM reprogramming are necessary. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary significantly based on location, shop rates, and the complexity of the repair.

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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 P27AB 2016 GMC Sierra Code

1. What does the OBDII code P27AB mean on a 2016 GMC Sierra?

P27AB indicates that the Transmission Control Module (TCM) has detected an incorrect calibration in Solenoid Valve 5, which controls fluid flow in the transmission.

2. What are the common symptoms of code P27AB on a 2016 GMC Sierra?

Symptoms may include harsh shifting, transmission slipping, erratic gear changes, illumination of the check engine light, and reduced fuel efficiency.

3. What causes the P27AB code to appear on my 2016 GMC Sierra?

Possible causes include a faulty transmission solenoid, low or contaminated transmission fluid, a damaged wiring harness, or an issue with the TCM.

4. Can I continue driving my 2016 GMC Sierra with code P27AB?

Driving with this code may lead to further transmission damage or unsafe driving conditions, so it’s best to address the issue as soon as possible.

5. How is code P27AB diagnosed on a 2016 GMC Sierra?

A technician will use an OBDII scanner to confirm the code, inspect the solenoid and wiring for damage, check the transmission fluid condition, and perform TCM tests.

6. How do I fix the P27AB code on my 2016 GMC Sierra?

Repairs may involve replacing the faulty solenoid, repairing damaged wiring, updating the TCM software, or flushing and refilling the transmission fluid.

7. What tools are needed to repair the P27AB code?

Common tools include an OBDII scanner, multimeter for electrical testing, and basic hand tools for accessing the transmission components.

8. Is the P27AB code covered under warranty for a 2016 GMC Sierra?

If your vehicle is still under a powertrain warranty, the repair may be covered. Check with your dealer for confirmation.

9. How much does it cost to fix the P27AB code on a 2016 GMC Sierra?

Repair costs can vary but typically range from $200 to $800, depending on whether the solenoid, wiring, or TCM needs replacing or reprogramming.

10. Can low transmission fluid cause the P27AB code?

Yes, low or contaminated transmission fluid can affect solenoid performance and trigger the P27AB code. Ensure the fluid is at the correct level and in good condition.

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