AutoCodes – Cadillac – P0966 Cadillac

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

Quick Answer

The pressure control solenoid 2 is part of the control solenoid valve assembly which has no serviceable parts. Common causes include Low transmission fluid, Faulty Control Solenoid Valve Assembly, Control Solenoid Valve Assembly harness is open or shorted. 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 Cadillac indicates Pressure Control Solenoid Valve 2 Control Circuit Low Voltage.
Common causes: Common causes include Low transmission fluid, Faulty Control Solenoid Valve Assembly, Control Solenoid Valve Assembly harness is open or shorted.
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 1,614

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 P0966 Cadillac Description

The pressure control solenoid 2 is part of the control solenoid valve assembly which has no serviceable parts. The normally high-pressure control solenoid 2 regulates and directs the pressure control solenoid 2 oil pressure to the 3-5 reverse clutch regulator valve and 3-5 reverse clutch boost valve. Increasing pressure control solenoid 2 pressure increases pressure to the 3-5 reverse clutch. The Transmission Control Module (TCM) varies the current to the pressure control solenoid 2 through a low side driver. Decreasing the current to the pressure control solenoid 2 increases pressure control solenoid 2 oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the pressure control solenoid 2 decreases pressure control solenoid 2 oil pressure by opening the solenoid exhaust port. Pressure control solenoid 2 power is supplied by the Transmission Control Module through a high side driver. The high-side driver protects the circuit and components from excessive current flow. If excessive current flow is detected, the high side driver will turn OFF. When the fault is corrected, the high-side driver will reset.
The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module detects a short to ground on the clutch pressure control solenoid 2 control circuit for 1 s.

OBDII Code P0966 Cadillac - Pressure Control Solenoid Valve 2 Control Circuit Low Voltage - AutoCodes.com — P0966 Cadillac Code - Pressure Control Solenoid Valve 2 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0966 Cadillac?

Low transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness is open or shorted
Control Solenoid Valve Assembly circuit poor electrical connection

How to Fix the DTC P0966 Cadillac?

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 P0966 Cadillac 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 P0966 Cadillac Code

1. What does the OBDII code P0966 mean on a Cadillac?

P0966 indicates a low voltage issue in the control circuit for Pressure Control Solenoid Valve 2, which helps regulate hydraulic pressure in the transmission.

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

Symptoms may include transmission slipping, harsh shifting, poor fuel efficiency, the transmission stuck in a single gear, or the check engine light being illuminated.

3. What causes the P0966 code to appear on a Cadillac?

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

4. Can low transmission fluid cause the P0966 code?

Yes, low or contaminated transmission fluid can lead to improper solenoid operation and trigger the P0966 code.

5. How do you diagnose the P0966 code on a Cadillac?

A technician will inspect the wiring and connectors for damage, test the pressure control solenoid with a multimeter, and check the transmission fluid level and condition.

6. Is it safe to drive a Cadillac with the P0966 code?

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

7. How much does it cost to fix the P0966 code on a Cadillac?

Repair costs vary but may include replacing the solenoid ($200â€“$400), fixing wiring issues ($100â€“$300), or addressing TCM problems ($500â€“$1,000), plus labor.

8. Can the P0966 code be fixed without replacing the solenoid?

Yes, if the issue is caused by damaged wiring, corroded connectors, or low fluid, repairing those components may resolve the problem.

9. How can I prevent the P0966 code from recurring on my Cadillac?

Regularly check and maintain transmission fluid levels, inspect wiring for damage, and follow the manufacturerâ€™s recommended service schedule for the transmission.

10. Will clearing the P0966 code with a scanner fix the problem?

Clearing the code may turn off the check engine light temporarily, but it will not fix the underlying issue causing the code to appear.