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

Quick Answer

The P0842 diagnostic trouble code (DTC) refers to the transmission fluid pressure switch 1 circuit having low voltage. Common causes include Malfunctioning transmission fluid pressure switch, Damaged wiring or connectors in the circuit, Low transmission fluid levels. 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 Malfunctioning transmission fluid pressure switch, Damaged wiring or connectors in the circuit, Low transmission fluid levels.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0842 2014 GMC Sierra Description

The P0842 diagnostic trouble code (DTC) refers to the transmission fluid pressure switch 1 circuit having low voltage. In automatic transmissions, the transmission fluid pressure switch is responsible for monitoring the hydraulic pressure inside the transmission. This information is crucial for the proper operation of the transmission, as it helps control gear shifting, torque converter lock-up, and overall performance. When the voltage in the circuit drops below the specified threshold, it triggers the P0842 code, indicating a potential issue with the transmission's fluid pressure system.

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

Common Causes of P0842 2014 GMC Sierra

  1. Malfunctioning transmission fluid pressure switch
  2. Damaged wiring or connectors in the circuit
  3. Low transmission fluid levels
  4. Faulty transmission control module
  5. Internal transmission mechanical issues

Symptoms of P0842 2014 GMC Sierra

  1. Harsh or delayed shifting
  2. Slipping gears
  3. Decreased fuel efficiency
  4. Transmission overheating
  5. Transmission warning light illuminated on the dashboard

How to Fix P0842 2014 GMC Sierra

  1. Diagnose the specific cause of the low voltage in the transmission fluid pressure switch circuit using a scan tool and multimeter.
  2. Inspect the wiring and connectors for any damage or corrosion and repair or replace as necessary.
  3. Check and adjust the transmission fluid level to ensure it is within the correct range.
  4. Test the transmission fluid pressure switch for proper operation and replace if faulty.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0842 2014 GMC Sierra

The typical repair costs for addressing a P0842 code can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. Additional costs may apply if other components need to be replaced or if there are underlying transmission problems that require attention. It is advisable to consult with a qualified mechanic or transmission specialist for an accurate estimate based on the vehicle's make and model. Keep in mind that labor rates can vary, so it's recommended to get quotes from multiple auto repair shops to compare prices.

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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 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.

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