P27AA 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P27AA 2015 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AA 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 P27AA 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.
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Frequently Asked Questions about P27AA 2015 GMC Sierra Code
1. What does the OBDII code P27AA mean on a 2015 GMC Sierra?
The code P27AA indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of Solenoid Valve 4 in the transmission.
2. What are the common symptoms of code P27AA in a 2015 GMC Sierra?
Symptoms may include erratic or delayed shifting, transmission slipping, harsh gear changes, poor fuel economy, or the check engine light turning on.
3. What causes the P27AA code to appear?
Common causes include a malfunctioning solenoid valve, incorrect transmission fluid levels, contaminated fluid, wiring or connector issues, or a software calibration problem in the TCM.
4. Can low transmission fluid cause the P27AA code?
Yes, low or contaminated transmission fluid can cause solenoid calibration issues, leading to the P27AA code.
5. How is the P27AA code diagnosed?
A technician will use a scan tool to check for stored codes, inspect wiring and connectors, test the solenoid’s resistance, and verify the transmission fluid condition and level.
6. Can I drive my 2015 GMC Sierra with the P27AA code?
Driving with this code is not recommended, as it can lead to further transmission damage or unsafe driving conditions.
7. How is the P27AA code fixed?
Repairs may include replacing the faulty solenoid, flushing and refilling transmission fluid, repairing damaged wiring, or reprogramming the TCM with updated software.
8. How much does it cost to repair the P27AA code?
The repair cost varies depending on the cause but may range from $150 to $500 for solenoid replacement, fluid service, or reprogramming.
9. Can a software update clear the P27AA code?
Yes, if the issue is related to outdated TCM software, reprogramming the module can resolve the code.
10. How can I prevent the P27AA code from recurring?
Regular transmission fluid maintenance, avoiding aggressive driving, and addressing any transmission issues early can help prevent this code.
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