AutoCodes – GMC – P27AB 2016 GMC Sierra

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

Quick Answer

The Transmission Control Solenoid Valve 1, 2, 3, 4, 5, 6, 7 have a unique current versus oil pressure characteristic that is used to properly upshift or downshift the transmission. Common causes include Solenoid Valve Characterization Reprogramming. 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 Solenoid Valve Characterization Reprogramming.
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.

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Code Popularity 187

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P27AB 2016 GMC Sierra Description

The Transmission Control Solenoid Valve 1, 2, 3, 4, 5, 6, 7 have a unique current versus oil pressure characteristic that is used to properly upshift or downshift the transmission. The data for each solenoid valve is programmed into the Transmission Control Module (TCM). The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Solenoid Valve Calibration Data has not been programmed.

OBDII Code P27AB 2016 GMC Sierra - Transmission Control Solenoid Valve 5 Calibration Incorrect - AutoCodes.com — P27AB 2016 GMC Sierra Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27AB 2016 GMC Sierra?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27AB 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P27AB 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P27AB 2016 GMC Sierra code?

Need more information on how to fix the P27AB 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27AB 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 itâ€™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.