AutoCodes – Chevrolet – P27A9 2015 Chevrolet Silverado

P27A9 2015 Chevrolet Silverado Code - Transmission Control Solenoid Valve 3 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: P27A9 2015 Chevrolet Silverado indicates Transmission Control Solenoid Valve 3 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.

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Code Popularity 309

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P27A9 2015 Chevrolet Silverado Description

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. The data for each solenoid valve is programmed into the Transmission Control Module (TCM). The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Solenoid Valve Calibration Data has not been programmed.

OBDII Code P27A9 2015 Chevrolet Silverado - Transmission Control Solenoid Valve 3 Calibration Incorrect - AutoCodes.com — P27A9 2015 Chevrolet Silverado Code - Transmission Control Solenoid Valve 3 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27A9 2015 Chevrolet Silverado?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27A9 2015 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 P27A9 2015 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.

Need more information about the P27A9 2015 Chevrolet Silverado code?

Need more information on how to fix the P27A9 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27A9 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P27A9 2015 Chevrolet Silverado Code

1. What does OBDII code P27A9 mean on a 2015 Chevrolet Silverado?

P27A9 indicates that the Transmission Control Module (TCM) has detected an issue with the calibration of solenoid valve 3 in the transmission.

2. What are the common symptoms of code P27A9 in a 2015 Chevrolet Silverado?

Symptoms may include harsh shifting, delayed gear engagement, transmission slipping, or the vehicle entering limp mode.

3. What causes the P27A9 code to appear on a 2015 Chevrolet Silverado?

Common causes include a faulty transmission control solenoid, incorrect solenoid calibration, wiring issues, or a malfunctioning TCM.

4. Can driving with a P27A9 code damage my Silverado?

Yes, driving with this code can lead to further transmission damage if not addressed promptly.

5. How is the P27A9 code diagnosed?

A technician will use a scan tool to confirm the code, check the transmission fluid level and condition, inspect the wiring and connectors, and test the solenoid's operation.

6. How do you fix the P27A9 code on a 2015 Chevrolet Silverado?

Repairs may involve recalibrating the solenoid, replacing the solenoid, repairing damaged wiring, or reprogramming or replacing the TCM.

7. Can low transmission fluid cause the P27A9 code?

Low or dirty transmission fluid can contribute to solenoid issues and may trigger the code.

8. How much does it cost to repair the P27A9 code on a Silverado?

The cost depends on the root cause, but solenoid replacement typically ranges from $150 to $400, while TCM replacement can cost $500 to $1,000.

9. Is the P27A9 code a common problem in the 2015 Chevrolet Silverado?

While not extremely common, transmission solenoid issues can occur in vehicles with higher mileage or poor maintenance history.

10. Can I fix the P27A9 code myself?

If you have experience with transmissions and access to diagnostic tools, you may be able to recalibrate or replace the solenoid. Otherwise, itâ€™s best to consult a professional.