AutoCodes – Buick – P0848 Buick

P0848 Buick Code - Transmission Fluid Pressure Switch 2 Circuit High 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: P0848 Buick indicates Transmission Fluid Pressure Switch 2 Circuit High 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 313

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 Aug 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0848 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 transmission fluid pressure switch 2 signal circuit is High when shift solenoid 2 is commanded ON for 1 s.

OBDII Code P0848 Buick - Transmission Fluid Pressure Switch 2 Circuit High Voltage - AutoCodes.com — P0848 Buick Code - Transmission Fluid Pressure Switch 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0848 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 P0848 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 P0848 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 P0848 Buick Code

What does OBD-II code P0848 mean for a Buick?

Code P0848 indicates that the Transmission Fluid Pressure Switch 2 Circuit is experiencing high voltage, suggesting an electrical issue within the pressure switch or its circuit.

What are the symptoms of code P0848 in a Buick?

Common symptoms include transmission shifting issues, erratic or delayed gear changes, slipping gears, or the transmission entering limp mode. The check engine light may also illuminate.

What causes the P0848 code in a Buick?

Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the pressure switch circuit, or issues with the transmission control module (TCM).

Can driving with code P0848 damage my Buick?

Itâ€™s not advisable to drive for extended periods with this code, as it can lead to further transmission damage or unsafe driving conditions due to erratic shifting.

How is code P0848 diagnosed?

Technicians diagnose this code by inspecting the wiring and connectors for damage, testing the pressure switch for proper operation, and using a scan tool to monitor sensor readings and transmission performance.

Can I fix code P0848 myself?

If youâ€™re experienced with automotive repairs, you can check for damaged wiring or loose connections. However, replacing the pressure switch or diagnosing electrical faults may require professional expertise.

How much does it cost to repair code P0848 on a Buick?

Repairs can range from $100 to $300 for wiring or sensor replacement. If the transmission control module is faulty, costs could exceed $500, depending on labor and parts.

Does P0848 always mean the transmission fluid pressure switch is bad?

No, the issue could be caused by electrical problems like damaged wiring, corroded connectors, or even a malfunctioning transmission control module.

What tools are needed to diagnose code P0848?

Basic tools include a multimeter for checking electrical continuity and a scan tool to read live data from the transmission control module and confirm the fault.

Will clearing code P0848 fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning and ensure proper transmission operation.