P27AA 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC P27AA 2018 Chevrolet Silverado?
- Solenoid Valve Characterization Reprogramming
How to Fix the DTC P27AA 2018 Chevrolet Silverado?
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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code
1. What does the OBDII code P27AA mean on a 2018 Chevrolet Silverado?
The P27AA code indicates that the Transmission Control Module (TCM) has detected an incorrect calibration for solenoid valve 4 in the transmission.
2. What are the symptoms of code P27AA in a 2018 Chevrolet Silverado?
Common symptoms include harsh or erratic shifting, transmission slipping, poor acceleration, or the check engine light being illuminated.
3. What causes the P27AA code in a 2018 Chevrolet Silverado?
The primary causes are a faulty transmission solenoid, incorrect TCM programming, low transmission fluid, or internal transmission issues like wear or debris.
4. Can I still drive my 2018 Chevrolet Silverado with the P27AA code?
While you may be able to drive the vehicle, it is not recommended as continued driving could cause further damage to the transmission.
5. How is the P27AA code diagnosed?
A technician will use a scan tool to verify the code, check transmission fluid levels, inspect the wiring and connectors, and perform a solenoid function test or TCM calibration check.
6. Can low transmission fluid cause the P27AA code?
Yes, low or contaminated transmission fluid can lead to erratic solenoid operation and trigger the P27AA code.
7. How do you fix the P27AA code on a 2018 Chevrolet Silverado?
Repairs may include updating the TCM software, replacing the faulty solenoid, repairing wiring issues, or servicing the transmission fluid.
8. How much does it cost to fix the P27AA code?
Costs vary but typically range from $150 to $500, depending on whether a software update, solenoid replacement, or more extensive transmission work is needed.
9. Can a P27AA code be cleared without repairs?
Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely return.
10. Is a TCM reprogramming necessary to fix the P27AA code?
In some cases, reprogramming or updating the TCM may resolve the issue if the calibration for solenoid valve 4 is incorrect.
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