AutoCodes – Buick – P0797 Buick

P0797 Buick Code - Pressure Control Solenoid Valve 3 Stuck On

Quick Answer

The clutch pressure control solenoid 3 is part of the control solenoid valve assembly, which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly. 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: P0797 Buick indicates Pressure Control Solenoid Valve 3 Stuck On.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Control Solenoid Valve Assembly.
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 3,196

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 P0797 Buick Description

The clutch pressure control solenoid 3 is part of the control solenoid valve assembly, which has no serviceable parts. The Clutch Pressure Control Solenoid 3 regulates transmission fluid pressure to the CBR1/C 4-5-6 clutch regulator valve which controls pressure to the low/reverse clutch and the 4-5-6 clutch. The Transmission Control Module calculates gear ratio based on the RPM signals from the input speed sensor (ISS) and the output speed sensor (OSS). The Transmission Control Module compares the expected transmission gear ratio to the calculated gear ratio for each commanded gear. The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Module has detected an incorrect gear ratio change when the low and reverse clutch and the 4-5-6 clutch is commanded OFF during a shift or when 4th gear ratio is detected in 1st gear. This condition must occur 3 times.

OBDII Code P0797 Buick - Pressure Control Solenoid Valve 3 Stuck On - AutoCodes.com — P0797 Buick Code - Pressure Control Solenoid Valve 3 Stuck On

What does this mean?

What are the Possible Causes of the DTC P0797 Buick?

Low transmission fluid level
Dirty transmission fluid
Faulty Control Solenoid Valve Assembly
Control Solenoid Valve Assembly harness or connectors
Control Solenoid Valve Assembly circuit is open or shorted

How to Fix the DTC P0797 Buick?

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 P0797 Buick 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 P0797 Buick Code

1. What does the OBDII code P0797 mean for a Buick?

P0797 indicates that the transmission control module (TCM) has detected that Pressure Control Solenoid Valve 3 is stuck in the "on" position, affecting transmission performance.

2. What are the common symptoms of a P0797 code in a Buick?

Symptoms may include harsh or erratic shifting, transmission slipping, reduced fuel efficiency, the transmission stuck in one gear, and the check engine light turning on.

3. What causes the P0797 code to appear on a Buick?

Common causes include a faulty pressure control solenoid, dirty or contaminated transmission fluid, internal transmission issues, wiring or electrical problems in the solenoid circuit, or a malfunctioning TCM.

4. How serious is the P0797 code on a Buick?

The code is moderately serious and should be addressed promptly. Ignoring it can cause further damage to the transmission, leading to more expensive repairs.

5. Can I still drive my Buick with a P0797 code?

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

6. How do I diagnose the P0797 code on a Buick?

Diagnosis typically involves scanning the vehicle with an OBDII tool, inspecting the transmission fluid for contamination or low levels, testing the pressure control solenoid, and checking the wiring and connections.

7. How can I fix the P0797 code on my Buick?

Repairs may include replacing the faulty pressure control solenoid, flushing and replacing the transmission fluid, repairing damaged wiring or connectors, or reprogramming or replacing the TCM if needed.

8. How much does it cost to repair a P0797 code in a Buick?

Repair costs vary but typically range from $200 to $500 for solenoid replacement. More extensive repairs, like TCM replacement or internal transmission repairs, can cost significantly more.

9. Can low transmission fluid cause the P0797 code on a Buick?

Yes, low or dirty transmission fluid can restrict proper solenoid operation, leading to the P0797 code.

10. Do I need to replace the entire transmission if I have a P0797 code?

Not necessarily. In most cases, the issue is related to the solenoid or fluid, which can be repaired without replacing the entire transmission. However, severe internal damage may require more extensive repairs.