P27AA 2017 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 2017 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 2017 GMC Sierra Description
What are the Possible Causes of the DTC P27AA 2017 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AA 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 P27AA 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.
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Frequently Asked Questions about P27AA 2017 GMC Sierra Code
1. What does the OBDII code P27AA mean on a 2017 GMC Sierra?
P27AA indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of Transmission Control Solenoid Valve 4.
2. What are common symptoms of the P27AA code?
Symptoms may include harsh or delayed shifting, slipping gears, transmission overheating, or the vehicle entering limp mode.
3. What causes the P27AA code to appear?
Common causes include faulty solenoid valve 4, degraded transmission fluid, calibration errors in the TCM, or wiring/connector issues.
4. Can I drive my 2017 GMC Sierra with the P27AA code?
Driving with this code is not recommended, as it may cause further damage to the transmission or lead to unsafe driving conditions.
5. How do I fix the P27AA code on my GMC Sierra?
Repairs may involve reprogramming or updating the TCM, replacing solenoid valve 4, fixing wiring/connector issues, or performing a transmission fluid flush.
6. How much does it cost to repair the P27AA code?
Repair costs can vary but typically range from $200 to $800 depending on whether reprogramming, solenoid replacement, or other repairs are required.
7. Can a low transmission fluid level cause the P27AA code?
Yes, low or contaminated transmission fluid can affect solenoid function and trigger this code.
8. How can I prevent the P27AA code from occurring?
Regularly maintain your transmission by checking fluid levels, replacing fluid as recommended, and addressing any transmission issues promptly.
9. Do I need to replace the entire transmission for the P27AA code?
No, in most cases, the issue can be resolved by addressing the solenoid, TCM, or related components without replacing the entire transmission.
10. Can a faulty TCM cause the P27AA code?
Yes, a malfunctioning Transmission Control Module can fail to properly calibrate solenoid valve 4, leading to this error code.
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