AutoCodes – GMC – P0842 2014 GMC Sierra

P0842 2014 GMC Sierra Code - Transmission Fluid Pressure Switch 1 Circuit Low Voltage

Quick Answer

The Transmission Fluid Pressure (TFP) switch 1 is part of the control solenoid valve assembly, which has no serviceable parts. 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: P0842 2014 GMC Sierra indicates Transmission Fluid Pressure Switch 1 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 314

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 P0842 2014 GMC Sierra Description

The Transmission Fluid Pressure (TFP) switch 1 is part of the control solenoid valve assembly, which has no serviceable parts. The Transmission Control Module (TCM) supplies a signal circuit to the TFP Switch 1. The TFP Switch 1 has an internal case ground. TFP Switch 1 is normally closed or LOW. When oil pressure is present at the TFP Switch 1, the switch is open or HIGH. The normally high clutch pressure control (PC) solenoid 2 controls pressure to the 3-5 reverse clutch regulator valve. The TCM monitors the TFP switch 1 to determine the position of the 3-5 reverse clutch regulator valve. When the 3-5 reverse clutch is commanded OFF, pressure is present on the TFP switch 1. When the 3-5 reverse clutch is commanded ON, the 3-5 reverse clutch regulator valve moves and pressure to the TFP switch 1 is exhausted through the 3-5 reverse clutch regulator valve. The Diagnostic Trouble Code (DTC) will be set when the TCM detects that the TFP switch 1 signal voltage remains LOW after the 3-5-R clutch transitions from a HIGH pressure state to a LOW pressure state. The TCM counts each incident. The DTC sets when 25 counts are accumulated.

OBDII Code P0842 2014 GMC Sierra - Transmission Fluid Pressure Switch 1 Circuit Low Voltage - AutoCodes.com — P0842 2014 GMC Sierra Code - Transmission Fluid Pressure Switch 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0842 2014 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

How to Fix the DTC P0842 2014 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 P0842 2014 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 P0842 2014 GMC Sierra code?

Need more information on how to fix the P0842 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0842 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P0842 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P0842 in a 2014 GMC Sierra?

The common symptoms of OBDII code P0842 in a 2014 GMC Sierra include harsh shifting, transmission slipping, decreased fuel efficiency, and in some cases, the transmission may fail to engage.

2. What does the OBDII code P0842 mean for a 2014 GMC Sierra?

OBDII code P0842 indicates that there is a low voltage condition detected in Transmission Fluid Pressure Switch 1 Circuit in a 2014 GMC Sierra, signaling a potential issue with the transmission fluid pressure.

3. What are the possible causes of OBDII code P0842 in a 2014 GMC Sierra?

The possible causes of OBDII code P0842 in a 2014 GMC Sierra include a faulty transmission fluid pressure switch, low transmission fluid level, damaged wiring or connectors, or a malfunctioning transmission control module.

4. How serious is OBDII code P0842 in a 2014 GMC Sierra?

OBDII code P0842 should be taken seriously as it can lead to transmission performance issues and potential damage if left unresolved. It is recommended to address the underlying cause promptly to prevent further damage.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P0842?

It is not recommended to continue driving your 2014 GMC Sierra with OBDII code P0842, as it can cause transmission problems and potentially lead to more severe issues. It is advisable to address the problem as soon as possible.

6. How can I diagnose OBDII code P0842 in my 2014 GMC Sierra?

Diagnosing OBDII code P0842 in a 2014 GMC Sierra involves using a diagnostic scanner to read the code, checking the transmission fluid level and condition, inspecting the wiring and connectors, and testing the transmission fluid pressure switch.

7. What are the repair options for OBDII code P0842 in a 2014 GMC Sierra?

Repair options for OBDII code P0842 in a 2014 GMC Sierra may include replacing the transmission fluid pressure switch, topping up or changing the transmission fluid, repairing or replacing damaged wiring or connectors, or reprogramming the transmission control module.

8. Can I reset OBDII code P0842 in my 2014 GMC Sierra by disconnecting the battery?

While disconnecting the battery may clear the code temporarily, it is not a recommended method to reset OBDII codes like P0842. It is best to diagnose and address the underlying issue to prevent the code from reoccurring.

9. How much does it typically cost to repair OBDII code P0842 in a 2014 GMC Sierra?

The cost of repairing OBDII code P0842 in a 2014 GMC Sierra can vary depending on the specific cause of the issue and the labor rates in your area. It is advisable to consult with a professional mechanic for an accurate estimate.

10. Is OBDII code P0842 a common issue in 2014 GMC Sierra vehicles?

While OBDII code P0842 may not be extremely common in 2014 GMC Sierra vehicles, it is still a potential issue that can arise due to various factors affecting the transmission system. Regular maintenance and prompt attention to any warning signs can help prevent such issues.