P27AA 2016 GMC Sierra Code - Transmission Control Solenoid Valve 4 Calibration Incorrect
Quick Answer
The P27AA diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is an issue with the Transmission Control Solenoid Valve 4 Calibration being incorrect. Common causes include Electrical issues such as a faulty wiring harness or connector, Mechanical failure of the solenoid valve, Software glitch in the transmission control module. 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 2016 GMC Sierra indicates Transmission Control Solenoid Valve 4 Calibration Incorrect.
- Common causes
- Common causes include Electrical issues such as a faulty wiring harness or connector, Mechanical failure of the solenoid valve, Software glitch in the transmission control module.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P27AA 2016 GMC Sierra Description
The P27AA diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there is an issue with the Transmission Control Solenoid Valve 4 Calibration being incorrect. The transmission control solenoid valves are responsible for controlling the flow of transmission fluid within the transmission. Solenoids are electromechanical valves that open and close to allow fluid to flow to different components within the transmission, such as the clutch packs and gear sets.
Common Causes of P27AA 2016 GMC Sierra
- Electrical issues such as a faulty wiring harness or connector
- Mechanical failure of the solenoid valve
- Software glitch in the transmission control module
- Low transmission fluid levels or contaminated fluid
- Wear and tear on the transmission components
Symptoms of P27AA 2016 GMC Sierra
- Harsh shifting between gears
- Delayed engagement when shifting from park to drive or reverse
- Slipping gears while driving
- Illumination of the Check Engine Light
- Decreased fuel efficiency
How to Fix P27AA 2016 GMC Sierra
- Perform a thorough diagnostic scan to confirm the P27AA code and identify the specific solenoid valve causing the issue.
- Inspect the wiring harness and connector for any signs of damage or corrosion. Repair or replace as needed.
- Test the solenoid valve for proper operation and replace if found to be faulty.
- Check and adjust the calibration of the solenoid valve using specialized diagnostic equipment.
- Clear the DTC and test drive the vehicle to ensure proper transmission operation.
Cost to Fix P27AA 2016 GMC Sierra
The typical repair costs for addressing a Transmission Control Solenoid Valve 4 Calibration Incorrect issue can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local repair shops for a more accurate estimate based on your specific situation. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.
Need more information about the P27AA 2016 GMC Sierra code?
Need more information on how to fix the P27AA 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P27AA 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P27AA 2016 GMC Sierra Code
1. What does OBDII code P27AA mean on a 2016 GMC Sierra?
P27AA indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of Solenoid Valve 4 in the transmission.
2. What are the symptoms of code P27AA in a 2016 GMC Sierra?
Common symptoms include harsh or delayed shifting, transmission slipping, poor acceleration, or the check engine light being illuminated.
3. What causes the P27AA code to appear?
Causes can include a faulty transmission solenoid, incorrect solenoid calibration, low or dirty transmission fluid, or a malfunctioning TCM.
4. Can driving with code P27AA damage my 2016 GMC Sierra?
Yes, driving with this code for an extended period can lead to further transmission damage or reduced vehicle performance.
5. How do I fix the P27AA code in my GMC Sierra?
Repairs may involve recalibrating the solenoid, replacing the solenoid valve, updating the TCM software, or performing a transmission fluid flush.
6. Can a low transmission fluid level trigger the P27AA code?
Yes, low or contaminated transmission fluid can affect solenoid operation and lead to this code.
7. How is the P27AA code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the transmission fluid, test the solenoid circuit, and check for TCM updates or faults.
8. Does the P27AA code always mean the solenoid is defective?
No, the issue could also stem from calibration errors, wiring problems, or issues with the TCM, not just a defective solenoid.
9. How much does it cost to fix the P27AA code?
Repair costs can range from $150 for a fluid flush to $500 or more for solenoid replacement or TCM programming.
10. Can the P27AA code be cleared without repairs?
Clearing the code without addressing the underlying issue may temporarily turn off the check engine light, but the problem will likely return.
Discuss the causes and fixes for P27AA 2016 GMC Sierra OBDII Code
Code P27AA 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.