AutoCodes – GMC – P2817 2018 GMC Sierra

P2817 2018 GMC Sierra Code - Transmission Control Solenoid Valve 8 Stuck Off

Quick Answer

The Transmission Control Module (TCM) uses the vehicle speed signal to determine the actual gear position (1st, 2nd, 3rd, 4th. Common causes include Faulty Transfer Case Shift Control Switch, Transfer Case Shift Control Switch harness is open or shorted, Transfer Case Shift Control Switch circuit poor electrical connection. 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: P2817 2018 GMC Sierra indicates Transmission Control Solenoid Valve 8 Stuck Off.
Common causes: Common causes include Faulty Transfer Case Shift Control Switch, Transfer Case Shift Control Switch harness is open or shorted, Transfer Case Shift Control Switch circuit poor electrical connection.
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 580

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2817 2018 GMC Sierra Description

The Transmission Control Module (TCM) uses the vehicle speed signal to determine the actual gear position (1st, 2nd, 3rd, 4th. 5th or 6th gear). The solenoid valve controls the flow of transmission fluid to the hydraulic valve that controls the system pressure in the transmission. Then the TCM compares the actual gear with the shift schedule in the TCM memory to detect shift solenoid valves and valve body mechanical problems.

OBDII Code P2817 2018 GMC Sierra - Transmission Control Solenoid Valve 8 Stuck Off - AutoCodes.com — P2817 2018 GMC Sierra Code - Transmission Control Solenoid Valve 8 Stuck Off

What does this mean?

What are the Possible Causes of the DTC P2817 2018 GMC Sierra?

Faulty Transfer Case Shift Control Switch
Transfer Case Shift Control Switch harness is open or shorted
Transfer Case Shift Control Switch circuit poor electrical connection

How to Fix the DTC P2817 2018 GMC Sierra?

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 P2817 2018 GMC Sierra 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 P2817 2018 GMC Sierra code?

Need more information on how to fix the P2817 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 P2817 2018 GMC Sierra Code

1. What does the OBDII code P2817 mean on a 2018 GMC Sierra?

The P2817 code indicates that the Transmission Control Module (TCM) has detected that solenoid valve 8 in the transmission is stuck in the "off" position, affecting gear operation.

2. What are the common symptoms of the P2817 code in a 2018 GMC Sierra?

Symptoms may include harsh shifting, slipping gears, failure to shift into certain gears, reduced fuel efficiency, and the illumination of the check engine light.

3. What causes the P2817 code to appear in a 2018 GMC Sierra?

Common causes include a faulty transmission solenoid valve, low or dirty transmission fluid, wiring or electrical connection issues, or an internal transmission problem.

4. Can I still drive my 2018 GMC Sierra with a P2817 code?

Driving with this code is not recommended as it can lead to further transmission damage or unsafe driving conditions due to shifting issues.

5. How is the P2817 code diagnosed on a 2018 GMC Sierra?

A mechanic will use a scan tool to confirm the code, inspect the transmission fluid, check for damaged wiring or connectors, and test the solenoid valve's functionality.

6. How do I fix the P2817 code in a 2018 GMC Sierra?

Repairs may include replacing the faulty solenoid valve, flushing and replacing the transmission fluid, repairing damaged wiring, or addressing internal transmission issues.

7. What is the cost to repair the P2817 code on a 2018 GMC Sierra?

Repair costs can vary widely but may range from $150 to $400 for solenoid replacement, with higher costs if internal transmission repairs are needed.

8. Can low transmission fluid cause the P2817 code in a 2018 GMC Sierra?

Yes, low or dirty transmission fluid can cause the solenoid to malfunction, leading to this code.

9. Does resetting the code clear the P2817 issue permanently?

No, resetting the code without addressing the underlying problem will only temporarily clear the code, and it will likely return.

10. How can I prevent the P2817 code from recurring in my 2018 GMC Sierra?

Regular transmission maintenance, including fluid changes and inspections, can help prevent solenoid issues and reduce the likelihood of this code appearing.