P27A8 2016 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 2016 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC P27A8 2016 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27A8 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 P27A8 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 P27A8 2016 GMC Sierra code?
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Frequently Asked Questions about P27A8 2016 GMC Sierra Code
1. What does OBDII code P27A8 mean on a 2016 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 cause shifting problems.
2. What are the common symptoms of code P27A8 in a 2016 GMC Sierra?
Common symptoms include harsh or delayed shifting, transmission slipping, reduced fuel efficiency, or the check engine light being illuminated.
3. What causes the P27A8 code to appear?
The code can be triggered by issues such as a faulty transmission solenoid, incorrect TCM programming, wiring problems, or internal transmission damage.
4. Can I drive my 2016 GMC Sierra with a P27A8 code?
While driving may still be possible, it’s not recommended as it could lead to further transmission damage or unsafe driving conditions.
5. How is the P27A8 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the transmission solenoid and wiring, and check the TCM for any software issues or calibration errors.
6. What repairs are needed to fix the P27A8 code?
Repairs may include reprogramming or updating the TCM, replacing the faulty solenoid, repairing damaged wiring, or addressing internal transmission issues.
7. How much does it cost to fix a P27A8 code on a GMC Sierra?
Repair costs can vary, but replacing a solenoid typically costs between $150 and $400, while TCM reprogramming or updates may cost around $100 to $200.
8. Can a P27A8 code be caused by low transmission fluid?
Yes, low or contaminated transmission fluid can affect solenoid performance and potentially trigger the P27A8 code.
9. How can I prevent the P27A8 code from recurring?
Regular maintenance, including checking transmission fluid levels and scheduling software updates for the TCM, can help prevent this issue.
10. Does the P27A8 code require reprogramming the TCM?
In some cases, reprogramming or recalibrating the TCM may be necessary to resolve the calibration issue causing the P27A8 code.
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