AutoCodes – Chevrolet – P27AB 2018 Chevrolet Silverado

P27AB 2018 Chevrolet Silverado Code - Transmission Control Solenoid Valve 5 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: P27AB 2018 Chevrolet Silverado indicates Transmission Control Solenoid Valve 5 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 228

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P27AB 2018 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 P27AB 2018 Chevrolet Silverado - Transmission Control Solenoid Valve 5 Calibration Incorrect - AutoCodes.com — P27AB 2018 Chevrolet Silverado Code - Transmission Control Solenoid Valve 5 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27AB 2018 Chevrolet Silverado?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27AB 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 P27AB 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.

Need more information about the P27AB 2018 Chevrolet Silverado code?

Need more information on how to fix the P27AB 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P27AB 2018 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 P27AB 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P27AB in a 2018 Chevrolet Silverado?

- Common symptoms include harsh shifting, transmission slippage, reduced fuel efficiency, and the transmission being stuck in one gear.

2. What causes the OBDII code P27AB to trigger in a 2018 Chevrolet Silverado?

- The code P27AB typically triggers when the Transmission Control Solenoid Valve 5 calibration is incorrect, leading to improper operation of the transmission.

3. How serious is the OBDII code P27AB in a 2018 Chevrolet Silverado?

- The code P27AB can affect the performance and drivability of the vehicle, potentially causing further damage to the transmission if left unaddressed.

4. Can I continue driving my 2018 Chevrolet Silverado with the OBDII code P27AB present?

- It is not recommended to continue driving with the code P27AB present, as it can lead to further transmission issues and potential safety hazards.

5. How can I diagnose the OBDII code P27AB in a 2018 Chevrolet Silverado?

- Diagnosis typically involves using a scan tool to retrieve the trouble code, inspecting the Transmission Control Solenoid Valve 5, and checking for any wiring or connection issues.

6. What is the typical repair for the OBDII code P27AB in a 2018 Chevrolet Silverado?

- The typical repair involves recalibrating or replacing the Transmission Control Solenoid Valve 5 to correct the calibration issue.

7. Can I reset the OBDII code P27AB in a 2018 Chevrolet Silverado without fixing the underlying issue?

- While you can clear the code temporarily, it will likely reappear until the root cause, such as the Transmission Control Solenoid Valve 5 calibration, is addressed.

8. How much does it cost to repair the OBDII code P27AB in a 2018 Chevrolet Silverado?

- The cost of repair can vary depending on the extent of the issue, but it may involve calibration adjustments or solenoid replacement, with costs ranging from a few hundred to over a thousand dollars.

9. Are there any preventive maintenance tips to avoid the OBDII code P27AB in a 2018 Chevrolet Silverado?

- Regular transmission fluid changes and periodic inspections of the transmission system can help prevent issues that may trigger the code P27AB.

10. Can a DIY enthusiast fix the OBDII code P27AB in a 2018 Chevrolet Silverado?

- While some may attempt DIY repairs, diagnosing and fixing the Transmission Control Solenoid Valve 5 calibration issue associated with the code P27AB may require specialized tools and expertise, making it more suitable for professional mechanics.