AutoCodes – Buick – P2729 Buick

P2729 Buick Code - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage

Quick Answer

The pressure control solenoid 5 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: P2729 Buick indicates Pressure Control Solenoid Valve 5 Control Circuit Low Voltage.
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 540

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 P2729 Buick Description

The pressure control solenoid 5 is part of the control solenoid valve assembly which has no serviceable parts. The normally low-pressure control solenoid 5 regulates and directs oil pressure to the 1-2-3-4 clutch regulator valve and 1-2-3-4 clutch boost valve. Increasing pressure control solenoid 5 pressure increases pressure to the 1-2-3-4 clutch. The Transmission Control Module varies the current to the pressure control solenoid 5 through a low-side driver. Increasing the current to pressure control solenoid 5 increases oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to pressure control solenoid 5 decreases oil pressure by opening the exhaust port. Pressure control solenoid 5 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 valve 5 control circuit for 1 s.

OBDII Code P2729 Buick - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage - AutoCodes.com — P2729 Buick Code - Pressure Control Solenoid Valve 5 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2729 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 P2729 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 P2729 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 P2729 Buick Code

1. What are the common symptoms of OBDII code P2729 in a Buick?

- Common symptoms include rough shifting, transmission slippage, poor acceleration, and the transmission staying in one gear.

2. What causes the OBDII code P2729 "Pressure Control Solenoid Valve 5 Control Circuit Low Voltage" in a Buick?

- The code is usually triggered by a faulty pressure control solenoid valve, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose the OBDII code P2729 in my Buick?

- Diagnosis typically involves checking the transmission fluid level and condition, inspecting the wiring and connectors related to the pressure control solenoid valve, and using a scan tool to retrieve any additional error codes.

4. Can I drive my Buick with the OBDII code P2729 present?

- It is not recommended to drive with the code present, as it can lead to further damage to the transmission. It's best to have the issue diagnosed and repaired as soon as possible.

5. How can I repair the OBDII code P2729 in my Buick?

- The repair may involve replacing the pressure control solenoid valve, repairing damaged wiring or connectors, topping up or changing the transmission fluid, or reprogramming the transmission control module.

6. Is it possible to reset the OBDII code P2729 in a Buick without fixing the underlying issue?

- While resetting the code may temporarily turn off the check engine light, the underlying issue causing the code will persist. It's important to address the problem to prevent further transmission damage.

7. Are there any DIY tips for fixing the OBDII code P2729 in a Buick?

- DIY tips may include checking and cleaning the connectors and wiring related to the pressure control solenoid valve, ensuring the transmission fluid is at the correct level, and following service manual procedures for your specific Buick model.

8. How much does it typically cost to repair the OBDII code P2729 in a Buick?

- The cost of repair can vary depending on the root cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a faulty pressure control solenoid valve cause other transmission issues besides triggering the OBDII code P2729?

- Yes, a faulty pressure control solenoid valve can cause various transmission problems, such as erratic shifting, slipping gears, and transmission overheating.

10. How long does it take to repair the OBDII code P2729 in a Buick?

- The repair time can vary based on the specific issue, but it may take a few hours to a day for a professional mechanic to diagnose and fix the problem associated with the code.