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Engine-Codes – GMC – P0843 2016 GMC Sierra

P0843 2016 GMC Sierra Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage

Quick Answer

The P0843 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Fluid Pressure Switch 1 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch, Wiring issues or shorts in the circuit, PCM malfunction. 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
P0843 2016 GMC Sierra indicates Transmission Fluid Pressure Switch 1 Circuit High Voltage.
Common causes
Common causes include Faulty transmission fluid pressure switch, Wiring issues or shorts in the circuit, PCM malfunction.
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 14, 2024
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Code P0843 2016 GMC Sierra Description

The P0843 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Transmission Fluid Pressure Switch 1 Circuit High Voltage. This code is specifically related to the transmission system of the vehicle. The transmission fluid pressure switch is responsible for monitoring the hydraulic pressure within the transmission. When the pressure is too high, it can lead to various issues with the transmission's operation.

OBDII Code P0843 2016 GMC Sierra - Transmission Fluid Pressure Switch 1 Circuit High Voltage
P0843 2016 GMC Sierra Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage

Common Causes of P0843 2016 GMC Sierra

  1. Faulty transmission fluid pressure switch
  2. Wiring issues or shorts in the circuit
  3. PCM malfunction
  4. Low transmission fluid level
  5. Contaminated or degraded transmission fluid

Symptoms of P0843 2016 GMC Sierra

  1. Harsh or delayed shifting
  2. Transmission slipping
  3. Illuminated Check Engine Light
  4. Transmission overheating
  5. Decreased fuel efficiency

How to Fix P0843 2016 GMC Sierra

  1. Begin by performing a thorough inspection of the transmission fluid pressure switch and its wiring harness. Replace the switch if it is found to be faulty.
  2. Check the transmission fluid level and condition. Top off or replace the fluid as needed.
  3. Inspect the wiring harness for any damage or corrosion. Repair or replace any damaged wires.
  4. Clear the DTC from the PCM memory using a diagnostic scan tool.
  5. Test drive the vehicle to ensure that the transmission is operating correctly and that the code does not return.

Cost to Fix P0843 2016 GMC Sierra

The typical repair costs for addressing a P0843 code on a 2016 GMC Sierra can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable pricing.

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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 P0843 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P0843 in a 2016 GMC Sierra?

The common symptoms of OBDII code P0843 in a 2016 GMC Sierra may include harsh shifting, transmission slipping, transmission overheating, and the transmission going into "limp mode."

2. What does OBDII code P0843 indicate in a 2016 GMC Sierra?

OBDII code P0843 in a 2016 GMC Sierra indicates a problem with the Transmission Fluid Pressure Switch 1 Circuit High Voltage.

3. What are the possible causes of OBDII code P0843 in a 2016 GMC Sierra?

Possible causes of OBDII code P0843 in a 2016 GMC Sierra include a faulty transmission fluid pressure switch, wiring or connector issues, low transmission fluid level, or a malfunctioning transmission control module.

4. How serious is OBDII code P0843 in a 2016 GMC Sierra?

OBDII code P0843 in a 2016 GMC Sierra should be addressed promptly to prevent potential transmission damage or unsafe driving conditions.

5. How can I diagnose OBDII code P0843 in a 2016 GMC Sierra?

Diagnosing OBDII code P0843 in a 2016 GMC Sierra typically involves using a scan tool to check for the code, inspecting the transmission fluid level and condition, and testing the transmission fluid pressure switch and related circuitry.

6. Can I drive my 2016 GMC Sierra with OBDII code P0843?

It is not recommended to drive a 2016 GMC Sierra with OBDII code P0843, as it can lead to further transmission issues and potentially unsafe driving conditions.

7. How can I repair OBDII code P0843 in a 2016 GMC Sierra?

Repairing OBDII code P0843 in a 2016 GMC Sierra may involve replacing the transmission fluid pressure switch, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid level, and resetting the fault code.

8. Is it possible to reset OBDII code P0843 in a 2016 GMC Sierra without repairs?

While you can clear the fault code temporarily, it is crucial to address the underlying issue causing OBDII code P0843 in a 2016 GMC Sierra to prevent further damage and ensure safe operation.

9. How much does it cost to fix OBDII code P0843 in a 2016 GMC Sierra?

The cost to fix OBDII code P0843 in a 2016 GMC Sierra can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs at a repair shop. It's recommended to get a diagnosis and estimate from a professional technician.

10. Can weather conditions affect OBDII code P0843 in a 2016 GMC Sierra?

Extreme weather conditions can potentially affect the operation of the transmission fluid pressure switch and related components, leading to the triggering of OBDII code P0843 in a 2016 GMC Sierra.

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