AutoCodes – GMC – P27AA 2014 GMC Sierra

P27AA 2014 GMC Sierra Code - Transmission Control Solenoid Valve 4 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: P27AA 2014 GMC Sierra indicates Transmission Control Solenoid Valve 4 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 178

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 P27AA 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 P27AA 2014 GMC Sierra - Transmission Control Solenoid Valve 4 Calibration Incorrect - AutoCodes.com — P27AA 2014 GMC Sierra Code - Transmission Control Solenoid Valve 4 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27AA 2014 GMC Sierra?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27AA 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 P27AA 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 P27AA 2014 GMC Sierra code?

Need more information on how to fix the P27AA 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27AA 2014 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 P27AA 2014 GMC Sierra Code

1. What does the OBDII code P27AA mean on a 2014 GMC Sierra?

P27AA indicates that Transmission Control Solenoid Valve 4 has an incorrect calibration, meaning the transmission control module (TCM) detected a mismatch in the expected and actual operation of the solenoid.

2. What are the common symptoms of the P27AA code on a 2014 GMC Sierra?

Symptoms may include harsh or delayed shifting, slipping gears, reduced fuel efficiency, illuminated check engine light, and transmission performance issues.

3. What causes the P27AA code to appear on a 2014 GMC Sierra?

Common causes include a faulty transmission control solenoid, damaged wiring or connectors in the transmission circuit, low or contaminated transmission fluid, or a malfunctioning TCM.

4. Can driving with the P27AA code damage my 2014 GMC Sierra?

Yes, continuing to drive with this code can cause further damage to the transmission, leading to more costly repairs if not addressed promptly.

5. How is the P27AA code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the solenoidâ€™s operation, check the wiring and connectors for damage, and evaluate the transmission fluid condition.

6. How do I fix the P27AA code on my 2014 GMC Sierra?

Repairs may include replacing the faulty transmission control solenoid, repairing damaged wiring, cleaning or replacing contaminated transmission fluid, or reprogramming the TCM.

7. Can low transmission fluid cause the P27AA code?

Yes, low or contaminated transmission fluid can result in improper solenoid operation and trigger the P27AA code.

8. How much does it cost to fix the P27AA code on a 2014 GMC Sierra?

The cost depends on the repair needed, ranging from $150â€“$400 for solenoid replacement to over $1,000 if TCM programming or more extensive transmission work is required.

9. Can I clear the P27AA code without fixing the issue?

Clearing the code without addressing the root cause will only temporarily remove it, and the problem is likely to reoccur, potentially worsening transmission damage.

10. Does the P27AA code require reprogramming the TCM?

In some cases, the TCM may require reprogramming or updating to resolve the calibration issue, especially if the solenoid and wiring are in proper working condition.