P27AA 2016 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 2016 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.
Code P27AA 2016 GMC Sierra Description
What are the Possible Causes of the DTC P27AA 2016 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AA 2016 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 2016 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 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.
