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P0963 GMC Code - Line Pressure Control Solenoid Valve Control Circuit High Voltage

Quick Answer

The P0963 GMC diagnostic trouble code (DTC) refers to a Line Pressure Control Solenoid Valve Control Circuit High Voltage issue. Common causes include Faulty line pressure control solenoid valve, Wiring harness issues, Damaged connector. 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
P0963 GMC indicates Line Pressure Control Solenoid Valve Control Circuit High Voltage.
Common causes
Common causes include Faulty line pressure control solenoid valve, Wiring harness issues, Damaged connector.
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 11, 2024
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Code P0963 GMC Description

The P0963 GMC diagnostic trouble code (DTC) refers to a Line Pressure Control Solenoid Valve Control Circuit High Voltage issue. This code indicates that the powertrain control module (PCM) has detected a high voltage condition in the circuit that controls the line pressure control solenoid valve in the transmission. The line pressure control solenoid valve is responsible for regulating the hydraulic pressure in the transmission, which is crucial for proper gear shifting and overall transmission performance.

OBDII Code P0963 GMC - Line Pressure Control Solenoid Valve Control Circuit High Voltage
P0963 GMC Code - Line Pressure Control Solenoid Valve Control Circuit High Voltage

Common Causes of P0963 GMC

  1. Faulty line pressure control solenoid valve
  2. Wiring harness issues
  3. Damaged connector
  4. Faulty PCM
  5. Transmission fluid contamination

Symptoms of P0963 GMC

  1. Harsh or delayed shifting
  2. Erratic transmission behavior
  3. Slipping gears
  4. Transmission overheating
  5. Illumination of the Check Engine Light

How to Fix P0963 GMC

  1. Begin by conducting a thorough inspection of the wiring harness, connectors, and the line pressure control solenoid valve for any visible damage or corrosion.
  2. Test the circuit using a digital multimeter to check for continuity and proper voltage levels.
  3. If the solenoid valve is found to be faulty, it will need to be replaced with a new one.
  4. Clear the DTC and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to identify the root cause of the issue.

Cost to Fix P0963 GMC

The cost of repairing a P0963 GMC code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, the parts cost for a new line pressure control solenoid valve can range from $100 to $300, while the labor cost can be between $150 to $300. Overall, the total repair cost for this issue could be in the range of $250 to $600. It's important to note that these are rough estimates, and actual costs may vary based on individual circumstances and location.

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Information for Specific GMC Models

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.

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