AutoCodes – Chevrolet – P27A8 Chevrolet

P27A8 Chevrolet 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 Chevrolet 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 448

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

What does this mean?

What are the Possible Causes of the DTC P27A8 Chevrolet?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27A8 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P27A8 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P27A8 2014 Chevrolet Silverado — Transmission Control Solenoid Valve 2 Calibration Incorrect
P27A8 2015 Chevrolet Silverado — Transmission Control Solenoid Valve 2 Calibration Incorrect
P27A8 2016 Chevrolet Silverado — Transmission Control Solenoid Valve 2 Calibration Incorrect
P27A8 2017 Chevrolet Silverado — Transmission Control Solenoid Valve 2 Calibration Incorrect
P27A8 2018 Chevrolet Silverado — Transmission Control Solenoid Valve 2 Calibration Incorrect

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 Chevrolet Code

What does the OBDII code P27A8 mean for my Chevrolet?

The OBDII code P27A8 indicates that there is an issue with the calibration of Transmission Control Solenoid Valve 2, which may prevent the transmission from shifting properly.

What symptoms might I experience with code P27A8?

You may experience symptoms such as erratic shifting, delayed shifting, slipping transmission, or the check engine light being illuminated on your dashboard.

What are common causes of the P27A8 code?

Common causes include a faulty transmission control solenoid, wiring issues, poor connections, low transmission fluid levels, or a malfunctioning transmission control module (TCM).

How can I diagnose the P27A8 code?

To diagnose the P27A8 code, use an OBDII scanner to confirm the code, inspect the transmission control solenoid and its wiring, check fluid levels, and look for any other related codes.

Can I drive my Chevrolet with the P27A8 code?

While it may be possible to drive your vehicle, it is not recommended as it can lead to further transmission damage or issues. It's best to address the problem promptly.

What repairs are needed for a P27A8 code?

Repairs may include replacing the transmission control solenoid, repairing any wiring issues, reprogramming or replacing the TCM, or addressing low fluid levels.

Is it safe to clear the code P27A8 without making repairs?

Clearing the code without repairs is not advisable as the underlying issue may still exist, potentially leading to more severe damage to the transmission.

How can I prevent the P27A8 code from recurring?

To prevent recurrence, ensure regular maintenance of the transmission system, keep fluid levels topped off, and address any transmission issues promptly.

Should I take my vehicle to a dealership or a mechanic for P27A8 repairs?

It depends on your comfort level and the complexity of the issue. A dealership may have more specialized knowledge, but a qualified mechanic can also effectively diagnose and repair the problem.