AutoCodes – GMC – P2809 2016 GMC Sierra

P2809 2016 GMC Sierra Code - Transmission Control Solenoid Valve 7 Stuck On

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: P2809 2016 GMC Sierra indicates Transmission Control Solenoid Valve 7 Stuck On.
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 192

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 P2809 2016 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 P2809 2016 GMC Sierra - Transmission Control Solenoid Valve 7 Stuck On - AutoCodes.com — P2809 2016 GMC Sierra Code - Transmission Control Solenoid Valve 7 Stuck On

What does this mean?

What are the Possible Causes of the DTC P2809 2016 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 P2809 2016 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 P2809 2016 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 P2809 2016 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 P2809 2016 GMC Sierra Code

1. What does the OBDII code P2809 mean on a 2016 GMC Sierra?

The P2809 code indicates that the Transmission Control Module (TCM) has detected that solenoid valve 7 is stuck in the "on" position, which can affect proper shifting.

2. What are the common symptoms of the P2809 code in a 2016 GMC Sierra?

Symptoms may include erratic or delayed shifting, the transmission stuck in one gear, reduced fuel efficiency, and the Check Engine Light or transmission warning light illuminating.

3. What causes the P2809 code to appear on a 2016 GMC Sierra?

Common causes include a faulty transmission solenoid, debris or contamination in the transmission fluid, wiring or connector issues, or a malfunctioning Transmission Control Module (TCM).

4. Can driving with the P2809 code damage my 2016 GMC Sierra?

Yes, driving with this code can cause further damage to the transmission if the issue is not addressed promptly, leading to more expensive repairs.

5. How is the P2809 code diagnosed on a 2016 GMC Sierra?

A mechanic will use a scan tool to read the code, inspect the transmission wiring and connectors, check the condition of the transmission fluid, and test the solenoid for functionality.

6. Can low or dirty transmission fluid cause the P2809 code in a 2016 GMC Sierra?

Yes, low or contaminated transmission fluid can cause solenoids to stick or malfunction, leading to the P2809 code.

7. How can I fix the P2809 code on my 2016 GMC Sierra?

Repairs may include replacing the faulty solenoid, cleaning or flushing the transmission fluid, repairing damaged wiring or connectors, or, in rare cases, replacing the Transmission Control Module (TCM).

8. How much does it cost to fix the P2809 code on a 2016 GMC Sierra?

The repair cost can range from $200 to $800 or more, depending on whether the solenoid needs replacement or if additional transmission repairs are required.

9. Can I clear the P2809 code without fixing the problem?

Clearing the code without addressing the cause may temporarily turn off the Check Engine Light, but the issue will likely return and could worsen over time.

10. How can I prevent the P2809 code from occurring on my 2016 GMC Sierra?

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