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P27AC 2014 GMC Sierra Code - Transmission Control Solenoid Valve 6 Calibration Incorrect

Quick Answer

The P27AC diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the Transmission Control Solenoid Valve 6 Calibration is Incorrect. Common causes include Faulty transmission control solenoid valve, Electrical issues in the transmission control module, Poor connection or wiring issues. 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
P27AC 2014 GMC Sierra indicates Transmission Control Solenoid Valve 6 Calibration Incorrect.
Common causes
Common causes include Faulty transmission control solenoid valve, Electrical issues in the transmission control module, Poor connection or wiring issues.
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 17, 2024
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Code P27AC 2014 GMC Sierra Description

The P27AC diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the Transmission Control Solenoid Valve 6 Calibration is Incorrect. This code specifically points to a problem with the calibration of the transmission control solenoid valve that is responsible for regulating the flow of transmission fluid within the transmission system. When the calibration is incorrect, it can lead to issues with shifting gears, transmission slippage, and overall poor performance of the vehicle.

OBDII Code P27AC 2014 GMC Sierra - Transmission Control Solenoid Valve 6 Calibration Incorrect
P27AC 2014 GMC Sierra Code - Transmission Control Solenoid Valve 6 Calibration Incorrect

Common Causes of P27AC 2014 GMC Sierra

  1. Faulty transmission control solenoid valve
  2. Electrical issues in the transmission control module
  3. Poor connection or wiring issues
  4. Software malfunction in the transmission control module
  5. Wear and tear on transmission components

Symptoms of P27AC 2014 GMC Sierra

  1. Erratic shifting patterns
  2. Harsh or delayed gear shifts
  3. Transmission slippage
  4. Stuck in a particular gear
  5. Decreased fuel efficiency

How to Fix P27AC 2014 GMC Sierra

  1. Diagnose the specific cause of the incorrect calibration using a professional diagnostic tool.
  2. Inspect the transmission control solenoid valve for any signs of damage or malfunction.
  3. Check the electrical connections and wiring related to the transmission control module.
  4. Perform a recalibration or reprogramming of the transmission control module.
  5. Replace the transmission control solenoid valve if necessary.

Cost to Fix P27AC 2014 GMC Sierra

The typical repair costs for addressing the P27AC code on a 2014 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that the actual repair costs may vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the type of engine. Additionally, diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It is recommended to obtain quotes from local repair shops for a more accurate estimate.

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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 P27AC 2014 GMC Sierra Code

What are the common symptoms of OBDII code P27AC in a 2014 GMC Sierra related to Transmission Control Solenoid Valve 6 Calibration Incorrect?

The common symptoms of OBDII code P27AC in a 2014 GMC Sierra may include rough shifting, transmission slipping, decreased fuel efficiency, and the Check Engine light being illuminated.

What are the possible causes of OBDII code P27AC in a 2014 GMC Sierra indicating Transmission Control Solenoid Valve 6 Calibration Incorrect?

Possible causes of OBDII code P27AC in a 2014 GMC Sierra can include a faulty transmission control solenoid valve, issues with the transmission control module, electrical problems, or calibration errors within the transmission system.

How can I diagnose OBDII code P27AC in my 2014 GMC Sierra related to Transmission Control Solenoid Valve 6 Calibration Incorrect?

Diagnosing OBDII code P27AC in a 2014 GMC Sierra involves using an OBDII scanner to retrieve the specific code, conducting a visual inspection of the transmission components, checking the transmission fluid level and condition, and performing a calibration check on the solenoid valve.

What are some repair tips for fixing OBDII code P27AC in a 2014 GMC Sierra indicating Transmission Control Solenoid Valve 6 Calibration Incorrect?

Repair tips for addressing OBDII code P27AC in a 2014 GMC Sierra include replacing the faulty transmission control solenoid valve, updating the transmission control module software, checking and repairing any damaged wiring or connectors, and recalibrating the transmission system.

Is it safe to continue driving my 2014 GMC Sierra with OBDII code P27AC related to Transmission Control Solenoid Valve 6 Calibration Incorrect?

It is not recommended to continue driving your 2014 GMC Sierra with OBDII code P27AC related to Transmission Control Solenoid Valve 6 Calibration Incorrect. Continuing to drive with this issue can potentially cause further damage to the transmission system and lead to more costly repairs.

How much does it typically cost to repair OBDII code P27AC in a 2014 GMC Sierra indicating Transmission Control Solenoid Valve 6 Calibration Incorrect?

The cost to repair OBDII code P27AC in a 2014 GMC Sierra can vary depending on the exact cause of the issue, the labor rates in your area, and whether you choose to repair it yourself or take it to a professional mechanic. Costs may range from $200 to $800 or more.

Can I reset OBDII code P27AC in my 2014 GMC Sierra indicating Transmission Control Solenoid Valve 6 Calibration Incorrect on my own?

While you can reset OBDII codes using an OBDII scanner, simply resetting the code will not fix the underlying issue causing code P27AC in your 2014 GMC Sierra. It is important to diagnose and repair the root cause of the problem to prevent the code from reoccurring.

What steps should I take if OBDII code P27AC in my 2014 GMC Sierra related to Transmission Control Solenoid Valve 6 Calibration Incorrect keeps coming back after repairs?

If OBDII code P27AC related to Transmission Control Solenoid Valve 6 Calibration Incorrect keeps coming back after repairs, it is advisable to recheck the repairs that were done, ensure all components are properly installed and functioning, and consider seeking assistance from a professional mechanic for further diagnosis and repair.

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