AutoCodes – GMC – P2818 GMC

P2818 GMC Code - Transmission Control Solenoid Valve 8 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: P2818 GMC indicates Transmission Control Solenoid Valve 8 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 642

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 P2818 GMC 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 P2818 GMC - Transmission Control Solenoid Valve 8 Stuck On - AutoCodes.com — P2818 GMC Code - Transmission Control Solenoid Valve 8 Stuck On

What does this mean?

What are the Possible Causes of the DTC P2818 GMC?

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 P2818 GMC?

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 P2818 GMC 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 P2818 GMC code?

Need more information on how to fix the P2818 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2818 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P2818 2014 GMC Sierra — Transmission Control Solenoid Valve 8 Stuck On
P2818 2015 GMC Sierra — Transmission Control Solenoid Valve 8 Stuck On
P2818 2016 GMC Sierra — Transmission Control Solenoid Valve 8 Stuck On
P2818 2017 GMC Sierra — Transmission Control Solenoid Valve 8 Stuck On
P2818 2018 GMC Sierra — Transmission Control Solenoid Valve 8 Stuck On

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 P2818 GMC Code

What does the OBDII code P2818 mean for my GMC vehicle?

The OBDII code P2818 indicates that the Transmission Control Solenoid Valve 8 is stuck in the 'on' position, which can affect transmission shifting and performance.

What are the common symptoms of the P2818 code?

Common symptoms include harsh or erratic shifting, slipping transmission, illuminated check engine light, and poor acceleration.

What could cause the P2818 code to appear?

Possible causes include a faulty transmission control solenoid, wiring issues, low transmission fluid levels, or problems with the transmission control module.

How can I diagnose the P2818 code?

To diagnose the P2818 code, check for other related codes, inspect the wiring and connections to the solenoid, examine the transmission fluid level and condition, and test the solenoid for proper operation.

What are the potential consequences of ignoring the P2818 code?

Ignoring the P2818 code can lead to worsening transmission performance, increased wear on transmission components, and potential transmission failure over time.

Can I drive my GMC with the P2818 code?

While it may be possible to drive your vehicle, it is not recommended as it can lead to further transmission issues and unsafe driving conditions.

What are some common repair tips for the P2818 code?

Common repairs include replacing the faulty transmission control solenoid, fixing any wiring issues, ensuring proper transmission fluid levels, and reprogramming or replacing the transmission control module if necessary.

Should I reset the check engine light after fixing the P2818 issue?

Yes, after addressing the underlying problem and making the necessary repairs, you should reset the check engine light to clear the code and verify that the issue is resolved.

Is it necessary to take my vehicle to a mechanic for the P2818 code?

While some minor issues can be addressed at home, it is advisable to consult a mechanic for proper diagnostics and repairs, especially if you're not experienced with transmission systems.