AutoCodes – GMC – P2808 2015 GMC Sierra

P2808 2015 GMC Sierra Code - Transmission Control Solenoid Valve 7 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: P2808 2015 GMC Sierra indicates Transmission Control Solenoid Valve 7 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 256

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 P2808 2015 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 P2808 2015 GMC Sierra - Transmission Control Solenoid Valve 7 Stuck Off - AutoCodes.com — P2808 2015 GMC Sierra Code - Transmission Control Solenoid Valve 7 Stuck Off

What does this mean?

What are the Possible Causes of the DTC P2808 2015 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 P2808 2015 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 P2808 2015 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 P2808 2015 GMC Sierra code?

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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 P2808 2015 GMC Sierra Code

1. What does the OBDII code P2808 mean on a 2015 GMC Sierra?

The P2808 code indicates that the Transmission Control Solenoid Valve 7 is stuck in the "off" position, causing issues with the transmission's operation.

2. What are the common symptoms of code P2808 in a 2015 GMC Sierra?

Symptoms may include harsh shifting, slipping gears, delayed or failed gear engagement, and the transmission going into limp mode.

3. What causes the P2808 code to trigger in a GMC Sierra?

Common causes include a faulty transmission control solenoid, dirty or low transmission fluid, damaged wiring or connectors, or internal transmission issues.

4. Can I drive my 2015 GMC Sierra with the P2808 code?

Driving with this code is not recommended, as it can lead to further transmission damage or unsafe driving conditions if the transmission fails to operate properly.

5. How do I fix the P2808 code on a 2015 GMC Sierra?

Repairs may involve replacing the faulty transmission control solenoid, cleaning or replacing the transmission fluid, and inspecting or repairing wiring and connectors.

6. How can I diagnose the P2808 code on my GMC Sierra?

A professional mechanic will use an OBDII scanner to read the code, inspect the solenoid and wiring, check the transmission fluid, and possibly perform a transmission pressure test.

7. What is a transmission control solenoid, and why is it important?

The transmission control solenoid regulates fluid flow in the transmission to control gear shifts. If it fails, the transmission cannot operate correctly.

8. How much does it cost to repair a P2808 code on a 2015 GMC Sierra?

The cost varies depending on the issue, but replacing a solenoid typically costs between $200 and $500, including parts and labor.

9. Can low transmission fluid cause the P2808 code?

Yes, low or dirty transmission fluid can cause the solenoid to malfunction, leading to the P2808 code.

10. How can I prevent the P2808 code from appearing again?

Regularly maintain your transmission by checking and replacing the fluid as needed, and address any transmission issues promptly to avoid solenoid damage.