P27AD 2016 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 2016 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 2016 GMC Sierra Description
What are the Possible Causes of the DTC P27AD 2016 GMC Sierra?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AD 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 P27AD 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 P27AD 2016 GMC Sierra code?
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Frequently Asked Questions about P27AD 2016 GMC Sierra Code
1. What does the OBDII code P27AD mean for a 2016 GMC Sierra?
P27AD indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of solenoid valve 7 in the transmission system.
2. What are the common symptoms of the P27AD code?
Symptoms may include harsh or delayed shifting, erratic transmission behavior, a check engine light, or entering limp mode.
3. What causes the P27AD code to appear?
Common causes include a malfunctioning transmission solenoid, incorrect programming or calibration of the TCM, wiring issues, or internal transmission problems.
4. Can I drive my 2016 GMC Sierra with the P27AD code?
While it may still be drivable, continuing to drive with this code can lead to further damage to the transmission. It’s best to address the issue promptly.
5. How is the P27AD code diagnosed?
A technician will use a scan tool to confirm the code, inspect the solenoid wiring and connectors, check for proper TCM programming, and test the solenoid for functionality.
6. How do you fix the P27AD code?
Repairs may include recalibrating or reprogramming the TCM, replacing the faulty solenoid, repairing damaged wiring, or addressing internal transmission issues.
7. How much does it cost to fix the P27AD code?
Repair costs vary but typically range from $150 to $500, depending on whether the solenoid or TCM requires repair or replacement.
8. Can a faulty TCM cause the P27AD code?
Yes, a malfunctioning or improperly programmed TCM can cause this code to appear due to incorrect calibration signals sent to solenoid valve 7.
9. How can I prevent the P27AD code from recurring?
Regular transmission maintenance, ensuring proper TCM updates, and addressing transmission issues promptly can help prevent this code from recurring.
10. Does the P27AD code always require solenoid replacement?
Not always. Sometimes reprogramming the TCM or fixing a wiring issue can resolve the problem without replacing the solenoid.
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