P27A8 2017 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 2017 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC P27A8 2017 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27A8 2017 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 2017 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 2017 GMC Sierra code?
Need more information on how to fix the P27A8 2017 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P27A8 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P27A8 2017 GMC Sierra Code
1. What does the OBDII code P27A8 mean for a 2017 GMC Sierra?
The P27A8 code indicates that the Transmission Control Module (TCM) has detected an incorrect calibration in Transmission Control Solenoid Valve 2.
2. What are the symptoms of a P27A8 code on a 2017 GMC Sierra?
Common symptoms include erratic shifting, delayed gear engagement, transmission slipping, or the Check Engine Light being illuminated.
3. What causes the P27A8 code to appear on a 2017 GMC Sierra?
This code is typically caused by a faulty transmission solenoid, incorrect solenoid calibration, wiring issues, or a malfunctioning Transmission Control Module (TCM).
4. Can I drive my 2017 GMC Sierra with a P27A8 code?
Driving with this code is not recommended as it can cause further damage to the transmission and worsen drivability issues.
5. How is the P27A8 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the solenoid wiring and connections, and test the transmission control solenoid for proper operation.
6. What repairs can fix the P27A8 code on a 2017 GMC Sierra?
Possible repairs include replacing the faulty solenoid, updating the TCM software, repairing damaged wiring, or replacing the TCM if necessary.
7. How much does it cost to fix a P27A8 code on a 2017 GMC Sierra?
Repair costs can vary but may range from $200 to $1,000 depending on whether the solenoid, wiring, or TCM needs replacement.
8. Can a transmission fluid issue cause the P27A8 code?
Yes, low or contaminated transmission fluid can affect solenoid operation and potentially trigger this code.
9. Does the P27A8 code require reprogramming the TCM?
In some cases, reprogramming or updating the TCM software may be necessary to resolve calibration issues.
10. Is the P27A8 code covered under the powertrain warranty for a 2017 GMC Sierra?
It may be covered if the vehicle is still within the powertrain warranty period, but you should check with your dealership for confirmation.
Discuss the causes and fixes for P27A8 2017 GMC Sierra OBDII Code
Code P27A8 2017 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.
