AutoCodes – Chevrolet – P27A9 2017 Chevrolet Silverado

P27A9 2017 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 2017 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 199

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 2017 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 2017 Chevrolet Silverado - Transmission Control Solenoid Valve 3 Calibration Incorrect - AutoCodes.com — P27A9 2017 Chevrolet Silverado Code - Transmission Control Solenoid Valve 3 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27A9 2017 Chevrolet Silverado?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27A9 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P27A9 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27A9 2017 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 2017 Chevrolet Silverado Code

1. What does OBDII code P27A9 mean for a 2017 Chevrolet Silverado?

The code P27A9 indicates that the Transmission Control Solenoid Valve 3 Calibration is Incorrect.

2. What are the common symptoms of OBDII code P27A9 in a 2017 Chevrolet Silverado?

Common symptoms include erratic shifting, transmission slipping, poor fuel economy, and the transmission getting stuck in a particular gear.

3. What are the possible causes of OBDII code P27A9 in a 2017 Chevrolet Silverado?

Possible causes include a faulty transmission control solenoid valve, electrical issues in the transmission control module, low transmission fluid levels, or a damaged wiring harness.

4. How can I diagnose OBDII code P27A9 in my 2017 Chevrolet Silverado?

Diagnosis typically involves using a professional OBDII scanner to read the trouble codes, checking the transmission fluid level and condition, inspecting the wiring harness for damage, and testing the transmission control solenoid valve.

5. Can I continue driving my 2017 Chevrolet Silverado with OBDII code P27A9?

It is not recommended to drive your vehicle with this code as it can lead to further damage to the transmission. It is best to address the issue promptly.

6. How can I repair OBDII code P27A9 in my 2017 Chevrolet Silverado?

Repair options may include replacing the Transmission Control Solenoid Valve 3, repairing any electrical issues in the transmission control module, ensuring proper transmission fluid levels, and fixing any damaged wiring.

7. Is it possible to reset OBDII code P27A9 in a 2017 Chevrolet Silverado without fixing the underlying issue?

While you can clear the code with an OBDII scanner, the underlying issue causing the code will persist until properly addressed. It is recommended to fix the problem to prevent further transmission issues.

8. How much does it cost to repair OBDII code P27A9 in a 2017 Chevrolet Silverado?

The cost of repair can vary depending on the exact cause of the code and the labor rates in your area. It is best to consult with a mechanic for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P27A9 in a 2017 Chevrolet Silverado?

While some experienced DIYers may be able to tackle the repairs related to this code, it is recommended to consult with a professional mechanic due to the complexity of transmission systems.

10. How often does OBDII code P27A9 occur in a 2017 Chevrolet Silverado?

The occurrence of this code can vary depending on the vehicle's maintenance and driving conditions. Regularly servicing the transmission and addressing any issues promptly can help prevent this code from appearing.