AutoCodes – GMC – P2814 2018 GMC Sierra

P2814 2018 GMC Sierra Code - Transmission Control Solenoid Valve 7 Control Circuit Low Voltage

Quick Answer

The Transmission Control Solenoid Valve Solenoid Valve is an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve. 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: P2814 2018 GMC Sierra indicates Transmission Control Solenoid Valve 7 Control Circuit Low Voltage.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve.
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 232

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 P2814 2018 GMC Sierra Description

The Transmission Control Solenoid Valve Solenoid Valve is an electronic pressure regulator that controls transmission line pressure based on current flow through its coil windings. As current flow is increased, the magnetic field produced by the coil moves the solenoid’s plunger further away from the exhaust port. Opening the exhaust port decreases the output fluid pressure regulated by the Transmission Control Solenoid Valve, which ultimately decreases line pressure. The line pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). The Diagnostic Trouble Code (DTC) is set when the Transmission Control Solenoid Valve Control Circuit commanded state does not match the actual state for greater than 1 s.

OBDII Code P2814 2018 GMC Sierra - Transmission Control Solenoid Valve 7 Control Circuit Low Voltage - AutoCodes.com — P2814 2018 GMC Sierra Code - Transmission Control Solenoid Valve 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2814 2018 GMC Sierra?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve
Transmission Control Solenoid Valve harness is open or shorted
Transmission Control Solenoid Valve circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P2814 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 P2814 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.

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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 P2814 2018 GMC Sierra Code

1. What does the OBDII code P2814 mean on a 2018 GMC Sierra?

The P2814 code indicates a "Transmission Control Solenoid Valve 7 Control Circuit Low Voltage," meaning the transmission control module has detected an electrical issue with solenoid 7.

2. What are the common symptoms of code P2814 on a 2018 GMC Sierra?

Symptoms may include harsh shifting, slipping gears, failure to shift, transmission staying in limp mode, or an illuminated check engine light.

3. What causes the P2814 code to appear on my 2018 GMC Sierra?

Common causes include a faulty transmission control solenoid, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or low transmission fluid.

4. Can low transmission fluid cause the P2814 code on a 2018 GMC Sierra?

Yes, low transmission fluid can cause improper solenoid operation, leading to the P2814 code. Check and refill the fluid as necessary.

5. How do I diagnose the P2814 code on my GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to check the solenoid's circuit for continuity and voltage. If no issues are found, test the solenoid itself.

6. Is it safe to drive my 2018 GMC Sierra with the P2814 code?

Driving with the P2814 code is not recommended, as it can lead to further transmission damage and unsafe driving conditions due to improper shifting.

7. How can I fix the P2814 code on my 2018 GMC Sierra?

Repairs may involve replacing the transmission control solenoid, repairing damaged wiring or connectors, or reprogramming or replacing the transmission control module (TCM).

8. How much does it cost to fix the P2814 code on a GMC Sierra?

Repair costs can range from $100 to $500 for solenoid replacement or wiring repairs. If the TCM requires replacement, costs may rise to $1,000 or more.

9. Can a bad TCM cause the P2814 code on my GMC Sierra?

Yes, a malfunctioning transmission control module can cause the P2814 code if it fails to properly control the solenoid circuit.

10. Do I need a professional mechanic to fix the P2814 code on a 2018 GMC Sierra?

While minor wiring repairs can be done by experienced DIYers, diagnosing and replacing solenoids or the TCM typically requires professional expertise and specialized tools.