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P27AD 2016 GMC Sierra Code - Transmission Control Solenoid Valve 7 Calibration Incorrect

Quick Answer

The P27AD diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is an issue with the Transmission Control Solenoid Valve 7 Calibration being incorrect. Common causes include Electrical malfunction in the transmission control solenoid valve, Mechanical issues within the transmission system, Software glitches in the transmission control module (TCM). 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
P27AD 2016 GMC Sierra indicates Transmission Control Solenoid Valve 7 Calibration Incorrect.
Common causes
Common causes include Electrical malfunction in the transmission control solenoid valve, Mechanical issues within the transmission system, Software glitches in the transmission control module (TCM).
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 11, 2024
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Code P27AD 2016 GMC Sierra Description

The P27AD diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is an issue with the Transmission Control Solenoid Valve 7 Calibration being incorrect. This code specifically relates to the control solenoid valve within the transmission system that is responsible for regulating the flow of transmission fluid to various components within the transmission. When the calibration of this solenoid valve is incorrect, it can lead to a range of issues that affect the vehicle's overall performance and drivability.

OBDII Code P27AD 2016 GMC Sierra - Transmission Control Solenoid Valve 7 Calibration Incorrect
P27AD 2016 GMC Sierra Code - Transmission Control Solenoid Valve 7 Calibration Incorrect

Common Causes of P27AD 2016 GMC Sierra

  1. Electrical malfunction in the transmission control solenoid valve
  2. Mechanical issues within the transmission system
  3. Software glitches in the transmission control module (TCM)
  4. Wiring harness or connector issues
  5. Low transmission fluid levels or contaminated fluid

Symptoms of P27AD 2016 GMC Sierra

  1. Erratic shifting behavior
  2. Harsh or delayed gear changes
  3. Transmission slipping
  4. Decreased fuel efficiency
  5. Transmission overheating

How to Fix P27AD 2016 GMC Sierra

  1. Diagnose the exact cause of the incorrect calibration using a scan tool to retrieve the specific trouble codes and data related to the transmission system.
  2. Inspect the transmission control solenoid valve 7 for any signs of damage or malfunction, and replace it if necessary.
  3. Check the wiring harness and connectors for any loose connections or damage, repairing or replacing them as needed.
  4. Perform a transmission fluid flush and refill with the manufacturer-recommended fluid to ensure proper operation.
  5. Clear the trouble codes, reset the TCM, and perform a test drive to verify that the issue has been resolved.

Cost to Fix P27AD 2016 GMC Sierra

The typical repair costs for addressing a Transmission Control Solenoid Valve 7 Calibration Incorrect code can vary depending on the extent of the issue and the specific components that require replacement. In general, the cost of replacing a transmission control solenoid valve can range from $150 to $400, including parts and labor. Additional costs may apply if there are other underlying issues that need to be addressed. It's important to note that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Therefore, it's advisable to check with local repair shops for a more accurate cost estimate based on your specific location and vehicle model.

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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 P27AD 2016 GMC Sierra Code

1. What does the OBDII code P27AD mean for a 2016 GMC Sierra?

P27AD indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of solenoid valve 7 in the transmission system.

2. What are the common symptoms of the P27AD code?

Symptoms may include harsh or delayed shifting, erratic transmission behavior, a check engine light, or entering limp mode.

3. What causes the P27AD code to appear?

Common causes include a malfunctioning transmission solenoid, incorrect programming or calibration of the TCM, wiring issues, or internal transmission problems.

4. Can I drive my 2016 GMC Sierra with the P27AD code?

While it may still be drivable, continuing to drive with this code can lead to further damage to the transmission. It’s best to address the issue promptly.

5. How is the P27AD code diagnosed?

A technician will use a scan tool to confirm the code, inspect the solenoid wiring and connectors, check for proper TCM programming, and test the solenoid for functionality.

6. How do you fix the P27AD code?

Repairs may include recalibrating or reprogramming the TCM, replacing the faulty solenoid, repairing damaged wiring, or addressing internal transmission issues.

7. How much does it cost to fix the P27AD code?

Repair costs vary but typically range from $150 to $500, depending on whether the solenoid or TCM requires repair or replacement.

8. Can a faulty TCM cause the P27AD code?

Yes, a malfunctioning or improperly programmed TCM can cause this code to appear due to incorrect calibration signals sent to solenoid valve 7.

9. How can I prevent the P27AD code from recurring?

Regular transmission maintenance, ensuring proper TCM updates, and addressing transmission issues promptly can help prevent this code from recurring.

10. Does the P27AD code always require solenoid replacement?

Not always. Sometimes reprogramming the TCM or fixing a wiring issue can resolve the problem without replacing the solenoid.

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