AutoCodes – GMC – P0848 GMC

P0848 GMC 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 GMC 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 450

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

What does this mean?

What are the Possible Causes of the DTC P0848 GMC?

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 GMC?

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 GMC 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.

Need more information about the P0848 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P0848 2014 GMC Sierra — Transmission Fluid Pressure Switch 2 Circuit High Voltage
P0848 2015 GMC Sierra — Transmission Fluid Pressure Switch 2 Circuit High Voltage
P0848 2016 GMC Sierra — Transmission Fluid Pressure Switch 2 Circuit High Voltage
P0848 2017 GMC Sierra — Transmission Fluid Pressure Switch 2 Circuit High Voltage
P0848 2018 GMC Sierra — Transmission Fluid Pressure Switch 2 Circuit High Voltage

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 GMC Code

What does the OBDII code P0848 mean on a GMC vehicle?

Code P0848 indicates a high voltage issue in the transmission fluid pressure switch 2 circuit, which monitors the hydraulic pressure inside the transmission.

What are common symptoms of code P0848 in a GMC?

Symptoms may include erratic shifting, transmission slipping, delayed gear engagement, reduced fuel efficiency, or the transmission going into limp mode.

What causes the P0848 code on GMC vehicles?

Common causes include a faulty transmission fluid pressure sensor, damaged wiring or connectors, low transmission fluid levels, or internal transmission issues.

Can driving with a P0848 code damage my GMC's transmission?

Yes, if left unresolved, this code can lead to poor transmission performance and potentially cause further damage to internal components.

How do I diagnose the P0848 code on my GMC?

Start by checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure sensor.

What tools are needed to troubleshoot the P0848 code on a GMC?

Youâ€™ll need an OBDII scanner, a multimeter for electrical testing, and potentially a transmission pressure gauge for further diagnosis.

How do you fix a P0848 code on a GMC vehicle?

Repairs may involve replacing the transmission fluid pressure sensor, repairing damaged wiring, cleaning connectors, or addressing internal transmission problems.

Will clearing the P0848 code solve the issue permanently?

Clearing the code may temporarily remove the warning, but the underlying problem must be fixed to prevent the code from returning.

Could low transmission fluid cause the P0848 code on a GMC?

Yes, low or contaminated transmission fluid can affect pressure readings and trigger this code.

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

Repair costs vary depending on the issue but may range from $150 to $500 for sensor replacement or wiring repairs. More extensive transmission repairs could cost significantly more.