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Engine-Codes – GMC – P0966 GMC

P0966 GMC Code - Pressure Control Solenoid Valve 2 Control Circuit Low Voltage

Quick Answer

The P0966 GMC code indicates a problem with the Pressure Control Solenoid Valve 2 Control Circuit having low voltage. Common causes include Faulty pressure control solenoid valve 2: The solenoid may be malfunctioning, causing low voltage signals, Wiring issues: Damaged or corroded wiring connections to the solenoid valve can lead to low voltage, Faulty transmission control module (TCM): The TCM may be sending incorrect signals to the 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
P0966 GMC indicates Pressure Control Solenoid Valve 2 Control Circuit Low Voltage.
Common causes
Common causes include Faulty pressure control solenoid valve 2: The solenoid may be malfunctioning, causing low voltage signals, Wiring issues: Damaged or corroded wiring connections to the solenoid valve can lead to low voltage, Faulty transmission control module (TCM): The TCM may be sending incorrect signals to the 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0966 GMC Description

The P0966 GMC code indicates a problem with the Pressure Control Solenoid Valve 2 Control Circuit having low voltage. This solenoid valve plays a crucial role in regulating the hydraulic pressure within the transmission system. When the voltage is lower than expected, it can lead to various issues with the transmission's performance, such as erratic shifting, harsh shifting, or even transmission slipping. If left unaddressed, this can cause further damage to the transmission system and result in costly repairs.

OBDII Code P0966 GMC - Pressure Control Solenoid Valve 2 Control Circuit Low Voltage
P0966 GMC Code - Pressure Control Solenoid Valve 2 Control Circuit Low Voltage

Common Causes of P0966 GMC

  1. Faulty pressure control solenoid valve 2: The solenoid may be malfunctioning, causing low voltage signals.
  2. Wiring issues: Damaged or corroded wiring connections to the solenoid valve can lead to low voltage.
  3. Faulty transmission control module (TCM): The TCM may be sending incorrect signals to the solenoid valve.
  4. Low transmission fluid level: Inadequate fluid levels can impact the solenoid valve's performance.
  5. Electrical issues: Issues with the vehicle's electrical system can also cause low voltage to the solenoid valve.

Symptoms of P0966 GMC

  1. Erratic shifting: The vehicle may experience abrupt or delayed gear shifts while driving.
  2. Harsh shifting: Shifting between gears may feel rough or jerky.
  3. Transmission slipping: The transmission may slip out of gear or struggle to engage properly.
  4. Decreased fuel efficiency: Due to the transmission not operating at optimal levels, fuel efficiency may decrease.
  5. Illuminated check engine light: The P0966 code will trigger the check engine light to alert the driver of a potential issue with the transmission system.

How to Fix P0966 GMC

  1. Diagnose the issue: Use a diagnostic tool to confirm the P0966 code and identify the exact cause of the low voltage signal.
  2. Inspect wiring and connections: Check the wiring harness and connectors for any damage or corrosion. Repair or replace as needed.
  3. Test pressure control solenoid valve 2: Test the solenoid valve to determine if it is functioning correctly. Replace if it is faulty.
  4. Check transmission fluid level: Ensure the transmission fluid is at the proper level and top up if necessary.
  5. Reset the code: Clear the code from the vehicle's system after completing the repairs to see if the issue has been resolved.

Cost to Fix P0966 GMC

The cost of repairing a P0966 GMC code can vary depending on the specific cause of the issue. Generally, the cost of replacing a pressure control solenoid valve 2 can range from $150 to $300, including parts and labor. Additional costs may apply if wiring repairs or TCM replacement is necessary. The total repair cost can accumulate to around $300 to $500. It is recommended to consult with a professional mechanic to get an accurate estimate based on the vehicle's make and model, as well as any additional repairs required. Labor rates can vary between $80 to $150 per hour, depending on the location and type of repair facility.

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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.

Frequently Asked Questions about P0966 GMC Code

1. What does the OBDII code P0966 mean for a GMC vehicle?

P0966 indicates a low voltage issue in the control circuit of Pressure Control Solenoid Valve 2, which affects transmission fluid pressure regulation.

2. What are the common symptoms of code P0966 in a GMC?

Symptoms include harsh or erratic shifting, transmission slipping, reduced fuel efficiency, and possible activation of the Check Engine Light.

3. What causes the P0966 code to appear in GMC vehicles?

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

4. Can low transmission fluid cause the P0966 code?

Yes, low or dirty transmission fluid can affect solenoid performance and trigger the P0966 code.

5. How do you diagnose the P0966 code in a GMC?

Diagnosis typically involves scanning for additional codes, inspecting solenoid circuit wiring and connectors, checking transmission fluid condition, and testing the solenoid for proper function.

6. Can I drive my GMC with the P0966 code?

Driving with this code is not recommended, as it can lead to further transmission damage and unsafe driving conditions.

7. How is the P0966 code fixed in a GMC?

Repairs may include replacing the pressure control solenoid, repairing damaged wiring or connectors, refilling or flushing transmission fluid, or updating/replacing the TCM.

8. How much does it cost to repair the P0966 code on a GMC?

Repair costs can range from $100 to $500 or more, depending on the exact issue, such as solenoid replacement or wiring repairs.

9. Can a faulty TCM cause the P0966 code in GMC vehicles?

Yes, a malfunctioning Transmission Control Module can lead to improper voltage signals and trigger the P0966 code.

10. How can I prevent the P0966 code from recurring in my GMC?

Regular maintenance, including checking transmission fluid levels, inspecting wiring for damage, and addressing transmission issues promptly, can help prevent this code.

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