P27AC 2016 GMC Sierra Code - Transmission Control Solenoid Valve 6 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
- P27AC 2016 GMC Sierra indicates Transmission Control Solenoid Valve 6 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 P27AC 2016 GMC Sierra Description
What are the Possible Causes of the DTC P27AC 2016 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AC 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 P27AC 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.
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Frequently Asked Questions about P27AC 2016 GMC Sierra Code
What does the OBDII code P27AC mean for a 2016 GMC Sierra?
The code P27AC indicates that Transmission Control Solenoid Valve 6 has an incorrect calibration, typically related to the valve's operation or programming.
What are the symptoms of the P27AC code in a 2016 GMC Sierra?
Common symptoms include erratic shifting, transmission slipping, delayed gear engagement, or the check engine light being illuminated.
What causes the P27AC code in a 2016 GMC Sierra?
Possible causes include a faulty transmission control solenoid valve, wiring or connection issues, damaged transmission fluid, or incorrect calibration settings in the transmission control module.
Can driving with the P27AC code damage my 2016 GMC Sierra?
Yes, driving with this code can lead to further transmission damage or unsafe driving conditions due to improper shifting.
How is the P27AC code diagnosed on a 2016 GMC Sierra?
A mechanic typically uses a scan tool to confirm the code, checks the wiring and connections for the solenoid, inspects the solenoid valve, and verifies calibration settings in the transmission control module.
What repairs are needed to fix the P27AC code on a 2016 GMC Sierra?
Repairs may involve replacing the faulty solenoid valve, repairing damaged wiring, flushing or replacing the transmission fluid, or recalibrating the transmission control module.
How much does it cost to fix the P27AC code on a 2016 GMC Sierra?
Repair costs vary, but replacing the solenoid valve typically ranges from $200 to $500, while recalibration or wiring repairs may cost less.
Can low transmission fluid cause the P27AC code on a 2016 GMC Sierra?
Yes, low or dirty transmission fluid can impact solenoid operation and contribute to calibration issues.
Do I need to reprogram the transmission control module for the P27AC code?
In some cases, reprogramming or updating the transmission control module may be necessary to resolve calibration issues.
Is the P27AC code a common issue for a 2016 GMC Sierra?
While not extremely common, it can occur, particularly in vehicles with high mileage or poorly maintained transmission systems.
Discuss the causes and fixes for P27AC 2016 GMC Sierra OBDII Code
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