AutoCodes – GMC – P27AB 2014 GMC Sierra

P27AB 2014 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 2014 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 139

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 2014 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 2014 GMC Sierra - Transmission Control Solenoid Valve 5 Calibration Incorrect - AutoCodes.com — P27AB 2014 GMC Sierra Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27AB 2014 GMC Sierra?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27AB 2014 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 2014 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 2014 GMC Sierra code?

Need more information on how to fix the P27AB 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2014 GMC Sierra Code

1. What does the OBDII code P27AB mean on a 2014 GMC Sierra?

P27AB indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of Transmission Control Solenoid Valve 5, which may impact shifting performance.

2. What are the symptoms of a P27AB code on a 2014 GMC Sierra?

Common symptoms include erratic shifting, transmission slipping, harsh gear changes, or the transmission failing to engage certain gears.

3. What causes the P27AB code to appear?

Possible causes include a faulty Transmission Control Solenoid Valve 5, incorrect calibration data in the TCM, damaged wiring or connectors, or low transmission fluid levels.

4. Can a P27AB code cause damage to my transmission?

If left unaddressed, it may cause long-term damage to the transmission due to improper shifting and increased wear on internal components.

5. How do I diagnose a P27AB code on my 2014 GMC Sierra?

Diagnosis typically involves scanning the TCM for related codes, checking the solenoidâ€™s wiring and connectors, inspecting the solenoidâ€™s operation, and verifying the transmission fluid level and condition.

6. How do you fix the P27AB code?

Repairs may include reprogramming or updating the TCM, replacing Transmission Control Solenoid Valve 5, repairing damaged wiring, or performing a transmission fluid and filter change.

7. Can I clear the P27AB code without fixing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning and potential worsening of transmission performance.

8. Is the P27AB code covered under warranty for a 2014 GMC Sierra?

It depends on the vehicleâ€™s mileage, age, and the specific warranty terms. Powertrain warranties may cover transmission-related issues.

9. Can low transmission fluid cause the P27AB code?

Yes, insufficient or contaminated transmission fluid can lead to improper solenoid operation, triggering the P27AB code.

10. Should I drive my 2014 GMC Sierra with a P27AB code?

Itâ€™s not recommended to drive for extended periods with this code active as it can lead to further transmission damage. Have it inspected and repaired as soon as possible.