AutoCodes – GMC – P27AB GMC

P27AB GMC 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 GMC 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 391

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

What does this mean?

What are the Possible Causes of the DTC P27AB GMC?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27AB GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

P27AB 2014 GMC Sierra — Transmission Control Solenoid Valve 5 Calibration Incorrect
P27AB 2015 GMC Sierra — Transmission Control Solenoid Valve 5 Calibration Incorrect
P27AB 2016 GMC Sierra — Transmission Control Solenoid Valve 5 Calibration Incorrect
P27AB 2017 GMC Sierra — Transmission Control Solenoid Valve 5 Calibration Incorrect
P27AB 2018 GMC Sierra — 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 GMC Code

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

- Common symptoms include rough shifting, transmission slippage, decreased fuel efficiency, and the transmission going into limp mode.

2. What causes the OBDII code P27AB GMC to trigger?

- The code P27AB is triggered when the Transmission Control Module detects that the calibration of Transmission Control Solenoid Valve 5 is incorrect.

3. How serious is OBDII code P27AB GMC?

- OBDII code P27AB should be addressed promptly to prevent further damage to the transmission system and ensure safe driving conditions.

4. How can I diagnose OBDII code P27AB GMC?

- Diagnosis involves using a scan tool to read the code, inspecting the transmission control solenoid valves, and checking for any wiring or connection issues.

5. Can I continue driving with OBDII code P27AB GMC?

- It is not recommended to continue driving with this code present, as it can lead to more severe transmission problems if left unresolved.

6. How do I repair OBDII code P27AB GMC?

- Repair typically involves recalibrating or replacing Transmission Control Solenoid Valve 5 to correct the calibration issue causing the code.

7. Can I reset OBDII code P27AB GMC without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear if the root cause of the calibration issue is not addressed.

8. Are there any DIY tips for fixing OBDII code P27AB GMC?

- DIYers with experience in automotive repair may attempt to recalibrate or replace the Transmission Control Solenoid Valve 5 themselves, but professional help is recommended.

9. How much does it cost to repair OBDII code P27AB GMC?

- The cost of repairing this code can vary depending on the extent of the issue, but it typically involves a few hundred dollars for parts and labor.

10. How long does it take to repair OBDII code P27AB GMC?

- The repair time can vary depending on the specific circumstances, but it may take a few hours to a day for a mechanic to diagnose and fix the calibration issue with Transmission Control Solenoid Valve 5.