P27AD 2014 GMC Sierra Code - Transmission Control Solenoid Valve 7 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
- P27AD 2014 GMC Sierra indicates Transmission Control Solenoid Valve 7 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 P27AD 2014 GMC Sierra Description
What are the Possible Causes of the DTC P27AD 2014 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AD 2014 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 P27AD 2014 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 P27AD 2014 GMC Sierra Code
1. What does the OBDII code P27AD mean on a 2014 GMC Sierra?
The P27AD code indicates that the Transmission Control Solenoid Valve 7 has an incorrect calibration, which may affect the transmission’s ability to shift properly.
2. What are the symptoms of a P27AD code on a 2014 GMC Sierra?
Symptoms may include harsh shifting, slipping gears, delayed gear engagement, or the transmission staying in limp mode.
3. What causes the P27AD code to appear?
Common causes include a faulty transmission solenoid, incorrect calibration data in the transmission control module (TCM), or wiring/connector issues related to the solenoid.
4. Can I drive my 2014 GMC Sierra with the P27AD code?
Driving with this code is not recommended, as it may lead to further transmission damage or unsafe driving conditions due to shifting issues.
5. How is the P27AD code diagnosed?
A mechanic will use a scan tool to check the TCM for stored codes, inspect the wiring and connectors, and test the solenoid's functionality and calibration.
6. What repairs are typically needed to fix the P27AD code?
Repairs may include replacing the faulty solenoid, reprogramming or updating the TCM, or repairing damaged wiring and connectors.
7. Is reprogramming the TCM necessary to clear the P27AD code?
In some cases, reprogramming or updating the TCM software is necessary to ensure the correct calibration for the solenoid.
8. How much does it cost to fix the P27AD code on a 2014 GMC Sierra?
Repair costs can range from $200 to $600 depending on whether the solenoid needs replacement, wiring repairs, or TCM reprogramming.
9. Can a dirty transmission fluid cause the P27AD code?
While not a primary cause, dirty or degraded transmission fluid can contribute to solenoid malfunctions, so a fluid change may help in certain cases.
10. Can I clear the P27AD code without fixing the issue?
Clearing the code without addressing the underlying issue will only result in the code reappearing, and the transmission problems will persist.
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