AutoCodes – Cadillac – P2729 Cadillac

P2729 Cadillac 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 Cadillac 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 357

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC P2729 Cadillac?

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 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 P2729 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 P2729 Cadillac Code

1. What does the OBDII code P2729 mean on a Cadillac?

P2729 indicates a problem with the Pressure Control Solenoid Valve 5 control circuit, specifically low voltage has been detected.

2. What are common symptoms of the P2729 code in a Cadillac?

Symptoms may include harsh or erratic shifting, transmission slipping, a failure to engage certain gears, decreased fuel efficiency, and the Check Engine Light turning on.

3. What causes the P2729 code to be triggered?

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

4. Can I drive my Cadillac with a P2729 code?

Itâ€™s not recommended to drive with this code active as it can lead to further damage to the transmission and may result in unsafe driving conditions.

5. How do I diagnose the P2729 code in my Cadillac?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and using a scan tool to monitor the solenoid's performance and test the TCM.

6. How can I fix the P2729 code on my Cadillac?

Repairs may include replacing the faulty pressure control solenoid, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the TCM.

7. What tools are needed to repair the P2729 code?

Youâ€™ll typically need a scan tool, a multimeter to test voltage and continuity, and basic hand tools for inspecting and repairing wiring or solenoids.

8. Is low transmission fluid a possible cause of the P2729 code?

Yes, low or contaminated transmission fluid can cause improper solenoid operation, potentially triggering the code.

9. How much does it cost to fix a P2729 code on a Cadillac?

The cost can vary widely, ranging from $150 to $400 for solenoid replacement or wiring repairs, and up to $1,000 or more if the TCM needs replacement.

10. Can a software update fix the P2729 code on my Cadillac?

In some cases, a TCM software update may resolve the issue if the code is caused by a programming error. Consult your dealership to confirm.