AutoCodes – Buick – P0872 Buick

P0872 Buick Code - Transmission Fluid Pressure Switch 3 Circuit Low Voltage

Quick Answer

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission 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: P0872 Buick indicates Transmission Fluid Pressure Switch 3 Circuit Low Voltage.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission 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 2,160

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 Aug 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0872 Buick Description

The transmission fluid pressure switch, also known as the pressure switch manifold, is a multiple switch assembly made up of 3 normally open pressure switches and 1 normally closed pressure switch. Pressure switch 1 monitors shift valve 1 positioning, pressure switch 2 monitors shift valve 2 positioning, pressure switch 3 monitors shift valve 3 positioning, and pressure switch 4 monitors the position of the manual selector valve. The TCM provides a signal circuit to each of the pressure switches. The TCM constantly monitors the circuits to determine the position of the shift valves. The position of shift valves 1, 2, and 3 is controlled by 3 normally closed shift solenoids. When energized, shift solenoid 1 directs fluid pressure to shift valve 1, shift solenoid 2 directs fluid pressure to shift valve 2, and shift solenoid 3 directs fluid pressure to shift valve 3, which strokes the shift valves. When a shift valve is stroked, an exhaust passage is blocked and fluid pressure increases, closing the normally open pressure switch. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that pressure switch 3 is Low when shift solenoid valve 3 is commanded OFF for 1 s.

OBDII Code P0872 Buick - Transmission Fluid Pressure Switch 3 Circuit Low Voltage - AutoCodes.com — P0872 Buick Code - Transmission Fluid Pressure Switch 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0872 Buick?

Low transmission fluid level
Dirty transmission fluid
Faulty Transmission Control Solenoid Valve Assembly
Transmission Control Solenoid Valve Assembly harness is open or shorted
Transmission Control Solenoid Valve Assembly circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P0872 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 P0872 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 P0872 Buick Code

1. What are the common symptoms of OBDII code P0872 in a Buick related to the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- Common symptoms may include harsh shifting, transmission slipping, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are some possible causes of OBDII code P0872 in a Buick indicating Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P0872 in my Buick for the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- Diagnosing this code typically involves checking the transmission fluid level and condition, inspecting the wiring and connectors related to the pressure switch, and using a scan tool to monitor sensor data.

4. Can I continue driving my Buick with OBDII code P0872 related to the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission and potentially cause unsafe driving conditions.

5. How can I repair OBDII code P0872 in my Buick for the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- Repair options may include replacing the faulty transmission fluid pressure switch, repairing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the trouble code with a scan tool.

6. Is it possible to clear OBDII code P0872 in my Buick related to the Transmission Fluid Pressure Switch 3 Circuit Low Voltage without fixing the underlying issue?

- Clearing the code without addressing the root cause is not recommended, as the issue may persist and lead to further transmission problems down the line.

7. Can a DIY enthusiast fix OBDII code P0872 in a Buick for the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- While some aspects of diagnosing and repairing this code can be done by a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.

8. How much does it typically cost to repair OBDII code P0872 in a Buick related to the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- The cost of repairs can vary depending on the specific cause of the issue, but it may range from $200 to $500 or more, including parts and labor.

9. Are there any preventive maintenance steps to avoid OBDII code P0872 in a Buick for the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- Regularly checking and maintaining proper transmission fluid levels, addressing any leaks promptly, and ensuring the transmission system is serviced according to the manufacturer's recommendations can help prevent this code from occurring.

10. How long does it typically take to repair OBDII code P0872 in a Buick related to the Transmission Fluid Pressure Switch 3 Circuit Low Voltage?

- The repair time can vary based on the specific cause of the issue and the complexity of the repair, but it may take a few hours to a full day to complete the necessary diagnostics and repairs.