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P2812 2018 GMC Sierra Code - Transmission Control Solenoid Valve 7 Control Circuit Open

Quick Answer

The diagnostic trouble code P2812 for a 2018 GMC Sierra indicates an issue with the Transmission Control Solenoid Valve 7 Control Circuit being open. Common causes include Faulty Transmission Control Solenoid Valve 7, Damaged wiring or connectors in the control circuit, Malfunctioning Transmission Control Module (TCM). 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
P2812 2018 GMC Sierra indicates Transmission Control Solenoid Valve 7 Control Circuit Open.
Common causes
Common causes include Faulty Transmission Control Solenoid Valve 7, Damaged wiring or connectors in the control circuit, Malfunctioning Transmission Control Module (TCM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P2812 2018 GMC Sierra Description

The diagnostic trouble code P2812 for a 2018 GMC Sierra indicates an issue with the Transmission Control Solenoid Valve 7 Control Circuit being open. The Transmission Control Solenoid Valve is a crucial component of the automatic transmission system, responsible for controlling the flow of transmission fluid to various components within the transmission. In this case, the control circuit for Solenoid Valve 7 is not functioning properly, which can lead to significant issues with the transmission's operation.

OBDII Code P2812 2018 GMC Sierra - Transmission Control Solenoid Valve 7 Control Circuit Open
P2812 2018 GMC Sierra Code - Transmission Control Solenoid Valve 7 Control Circuit Open

Common Causes of P2812 2018 GMC Sierra

  1. Faulty Transmission Control Solenoid Valve 7
  2. Damaged wiring or connectors in the control circuit
  3. Malfunctioning Transmission Control Module (TCM)
  4. Electrical issues in the vehicle's system
  5. Corrosion or debris blocking the solenoid valve

Symptoms of P2812 2018 GMC Sierra

  1. Harsh or erratic shifting
  2. Delayed engagement when shifting gears
  3. Transmission slipping or overheating
  4. Illumination of the Check Engine Light
  5. Reduced fuel efficiency

How to Fix P2812 2018 GMC Sierra

  1. Diagnose the issue using a scan tool to verify the P2812 code and conduct further testing to identify the exact cause.
  2. Inspect the wiring and connectors in the control circuit for any damage or corrosion, repairing or replacing as needed.
  3. Test the Transmission Control Solenoid Valve 7 for proper operation and replace if found to be faulty.
  4. Check the Transmission Control Module (TCM) for any malfunctions and reprogram or replace as necessary.
  5. Clear the code from the vehicle's computer system and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2812 2018 GMC Sierra

The typical repair costs for addressing the P2812 code on a 2018 GMC Sierra can vary depending on the exact cause of the issue and the extent of repairs needed. On average, the cost of replacing a Transmission Control Solenoid Valve can range from $150 to $300, while labor costs can add an additional $100 to $200. If the issue is related to wiring or the Transmission Control Module, the repair costs may increase accordingly. It's recommended to consult with a reputable auto repair shop for a more accurate cost estimate based on the specific circumstances of the vehicle in question. Keep in mind that labor rates can vary between different locations and types of repair facilities.

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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 P2812 2018 GMC Sierra Code

1. What does the OBDII code P2812 mean on a 2018 GMC Sierra?

P2812 indicates an issue with the Transmission Control Solenoid Valve 7 Control Circuit, specifically an open circuit.

2. What are the common symptoms of P2812 in a 2018 GMC Sierra?

Symptoms may include harsh shifting, transmission slipping, failure to engage certain gears, or the vehicle entering "limp mode."

3. What causes the P2812 code to appear in a GMC Sierra?

Common causes include a faulty transmission control solenoid, damaged wiring or connectors in the circuit, or a malfunctioning transmission control module (TCM).

4. Can I continue driving my 2018 GMC Sierra with the P2812 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to further transmission damage. It’s best to address the issue promptly.

5. How do I diagnose the P2812 code on a 2018 GMC Sierra?

Diagnosis typically involves inspecting the wiring and connectors for damage, testing the transmission control solenoid for proper function, and scanning the TCM for additional codes or malfunctions.

6. Is P2812 a serious issue for my 2018 GMC Sierra?

Yes, it can be serious as it affects the transmission’s ability to function properly, potentially leading to costly repairs if ignored.

7. How much does it cost to fix the P2812 code on a GMC Sierra?

Repair costs vary but may range from $150 to $500, depending on whether the issue is a damaged wire, a faulty solenoid, or a more complex TCM problem.

8. Can a bad battery cause the P2812 code to appear?

While rare, a weak or failing battery can sometimes lead to electrical issues that may affect the transmission control circuit.

9. What tools are needed to fix the P2812 code on a 2018 GMC Sierra?

You may need an OBDII scanner, a multimeter for testing electrical circuits, and basic tools to access the transmission components.

10. Does the transmission fluid condition affect the P2812 code?

Yes, dirty or low transmission fluid can contribute to solenoid issues, so checking and replacing the fluid is a good starting point.

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