AutoCodes – Chevrolet – P27A8 2017 Chevrolet Silverado

P27A8 2017 Chevrolet Silverado Code - Transmission Control Solenoid Valve 2 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: P27A8 2017 Chevrolet Silverado indicates Transmission Control Solenoid Valve 2 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 188

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 P27A8 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 P27A8 2017 Chevrolet Silverado - Transmission Control Solenoid Valve 2 Calibration Incorrect - AutoCodes.com — P27A8 2017 Chevrolet Silverado Code - Transmission Control Solenoid Valve 2 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27A8 2017 Chevrolet Silverado?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27A8 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 P27A8 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 P27A8 2017 Chevrolet Silverado code?

Need more information on how to fix the P27A8 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27A8 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 P27A8 2017 Chevrolet Silverado Code

1. What does the OBDII code P27A8 mean on a 2017 Chevrolet Silverado?

The code P27A8 indicates "Transmission Control Solenoid Valve 2 Calibration Incorrect," meaning the transmission control module (TCM) has detected an issue with the calibration of solenoid valve 2.

2. What are the symptoms of code P27A8 in a 2017 Chevrolet Silverado?

Common symptoms include harsh or delayed shifting, transmission slipping, poor acceleration, and the illumination of the check engine light.

3. What causes the P27A8 code to appear?

Possible causes include a faulty solenoid valve 2, outdated or corrupted TCM software, hydraulic issues in the transmission, or electrical problems like damaged wiring or poor connections.

4. Can driving with the P27A8 code cause further damage to my Silverado?

Yes, continuing to drive with this code could lead to further transmission damage or unsafe driving conditions due to shifting issues.

5. How do I diagnose the P27A8 code on my 2017 Chevrolet Silverado?

Diagnose the code by using an OBDII scanner, inspecting the transmission wiring and connectors, checking for TCM software updates, and testing solenoid valve 2 for proper function.

6. Is the P27A8 code a common problem in the 2017 Chevrolet Silverado?

While not extremely common, it can occur, especially in vehicles with higher mileage or those that have experienced transmission wear or electrical issues.

7. How is the P27A8 code repaired?

Repairs may include reprogramming or updating the TCM, replacing solenoid valve 2, addressing wiring or connector issues, or performing a transmission fluid flush if contamination is suspected.

8. How much does it cost to fix the P27A8 code in a Chevrolet Silverado?

Repair costs can range from $200 to $1,500, depending on whether the issue involves simple reprogramming, solenoid replacement, or more extensive transmission repairs.

9. Can I reset the P27A8 code without fixing the problem?

While you can clear the code with an OBDII scanner, it will likely return if the underlying issue is not resolved.

10. Should I update the TCM software to fix the P27A8 code?

Yes, if there is an available TCM software update from Chevrolet, performing the update may resolve calibration-related issues associated with this code.