AutoCodes – GMC – P0848 2017 GMC Sierra

P0848 2017 GMC Sierra 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 2017 GMC Sierra 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 188

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 2017 GMC Sierra 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 2017 GMC Sierra - Transmission Fluid Pressure Switch 2 Circuit High Voltage - AutoCodes.com — P0848 2017 GMC Sierra Code - Transmission Fluid Pressure Switch 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0848 2017 GMC Sierra?

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 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra code?

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Need Help with the Code?

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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 2017 GMC Sierra Code

What does the OBDII code P0848 mean for a 2017 GMC Sierra?

P0848 indicates that the transmission fluid pressure switch 2 circuit is experiencing high voltage, which can affect the transmission's ability to operate properly.

What are the common symptoms of code P0848 in a 2017 GMC Sierra?

Symptoms may include erratic or delayed shifting, transmission slipping, poor fuel economy, or the vehicle going into limp mode.

What causes the P0848 code in a 2017 GMC Sierra?

Common causes include a malfunctioning transmission fluid pressure switch, damaged wiring or connectors, low transmission fluid levels, or a fault in the transmission control module.

Can low transmission fluid trigger the P0848 code?

Yes, low transmission fluid levels can cause abnormal pressure readings and potentially trigger the P0848 code.

How do I diagnose the P0848 code in a 2017 GMC Sierra?

Diagnose the code by inspecting wiring and connectors near the transmission, checking transmission fluid levels, testing the pressure switch, and using a scan tool to monitor live data.

Is it safe to drive with the P0848 code active?

Driving with this code active is not recommended as it can lead to transmission damage or unsafe driving conditions due to erratic shifting.

How can I fix the P0848 code on a 2017 GMC Sierra?

Repairs may include replacing the transmission fluid pressure switch, repairing damaged wiring or connectors, refilling or flushing transmission fluid, or reprogramming the transmission control module.

Does the P0848 code require professional repair?

While some issues like low transmission fluid can be fixed by the owner, diagnosing electrical faults or replacing components often requires professional expertise.

Can a faulty transmission fluid pressure switch cause other issues?

Yes, a faulty pressure switch can lead to incorrect pressure readings, affecting gear engagement and overall transmission performance.

How much does it cost to repair the P0848 code on a 2017 GMC Sierra?

Repair costs can vary but typically range from $150 to $400, depending on whether the issue is with the pressure switch, wiring, or transmission control module.