P27A8 2015 GMC Sierra Code - Transmission Control Solenoid Valve 2 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
- P27A8 2015 GMC Sierra indicates Transmission Control Solenoid Valve 2 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 P27A8 2015 GMC Sierra Description
What are the Possible Causes of the DTC P27A8 2015 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27A8 2015 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 P27A8 2015 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 P27A8 2015 GMC Sierra code?
Need more information on how to fix the P27A8 2015 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P27A8 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P27A8 2015 GMC Sierra Code
1. What does the OBDII code P27A8 mean on a 2015 GMC Sierra?
P27A8 indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of Transmission Control Solenoid Valve 2, which may affect the transmission's operation.
2. What are common symptoms of the P27A8 code on a 2015 GMC Sierra?
Symptoms may include erratic shifting, transmission slipping, harsh gear changes, or the transmission going into limp mode. The Check Engine Light may also illuminate.
3. What causes the P27A8 code to appear on a 2015 GMC Sierra?
This code is usually caused by a faulty or miscalibrated transmission control solenoid, software issues in the TCM, wiring or connector problems, or contaminated transmission fluid.
4. Can I drive my 2015 GMC Sierra with the P27A8 code?
It is not recommended to drive for extended periods with this code, as transmission problems can worsen and lead to further damage or unsafe driving conditions.
5. How is the P27A8 code diagnosed?
A technician will typically use a scan tool to verify the code, inspect the transmission wiring and connectors, check the solenoid's operation, and possibly perform a reprogramming or calibration of the TCM.
6. How do I fix the P27A8 code on my 2015 GMC Sierra?
Repairs may include replacing the faulty solenoid, updating or reprogramming the TCM, repairing damaged wiring, or changing the transmission fluid if contaminated.
7. Does the P27A8 code always require replacing the solenoid?
Not always. In some cases, recalibrating the TCM or addressing wiring issues may resolve the problem without replacing the solenoid.
8. How much does it cost to fix the P27A8 code on a 2015 GMC Sierra?
Repair costs can vary but typically range from $200 to $600, depending on whether the solenoid needs replacement or if reprogramming or wiring repairs are required.
9. Can low transmission fluid cause the P27A8 code?
Yes, low or contaminated transmission fluid can affect solenoid performance and trigger the P27A8 code.
10. Is a TCM software update required for the P27A8 code on a 2015 GMC Sierra?
In some cases, a TCM software update or reprogramming may be necessary to address calibration issues and clear the code.
Discuss the causes and fixes for P27A8 2015 GMC Sierra OBDII Code
Code P27A8 2015 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.
