Engine-Codes.com
Engine-Codes – Generic – P0843

P0843 Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit High

Quick Answer

The P0843 code indicates a problem with the Transmission Fluid Pressure Sensor/Switch 'A' Circuit being high. Common causes include Faulty transmission fluid pressure sensor/switch, Clogged transmission filter, Malfunctioning transmission pump. 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 indicates Transmission Fluid Pressure Sensor/Switch 'A' Circuit High.
Common causes
Common causes include Faulty transmission fluid pressure sensor/switch, Clogged transmission filter, Malfunctioning transmission pump.
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 09, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0843 Description

The P0843 code indicates a problem with the Transmission Fluid Pressure Sensor/Switch 'A' Circuit being high. This sensor is responsible for monitoring the hydraulic pressure inside the transmission. When the sensor detects that the pressure is too high, it can trigger this diagnostic trouble code (DTC). This issue can have serious implications for the vehicle's performance and overall health.

OBDII Code P0843 - Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
P0843 Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit High

Common Causes of P0843

  1. Faulty transmission fluid pressure sensor/switch
  2. Clogged transmission filter
  3. Malfunctioning transmission pump
  4. Transmission control module issues
  5. Low transmission fluid levels

Symptoms of P0843

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

How to Fix P0843

  1. Begin by diagnosing the specific cause of the high transmission fluid pressure using a scan tool to read the DTC and determine the sensor's output data.
  2. Inspect the transmission fluid pressure sensor/switch for any signs of damage or malfunction. Replace if necessary.
  3. Check the transmission filter for any blockages or debris that may be causing the pressure to build up. Replace the filter if needed.
  4. Inspect the transmission pump for proper operation and replace if it is failing to maintain the correct pressure.
  5. Clear the DTC from the vehicle's computer system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix P0843

The cost of repairing a P0843 code can vary depending on the specific cause of the issue. Typically, the cost of replacing a transmission fluid pressure sensor/switch ranges from $150 to $300, including parts and labor. If additional components such as the transmission filter or pump need to be replaced, the cost can increase accordingly. It is advisable to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model. Keep in mind that labor rates can vary between different shops and locations.

What does this mean?

Tech Notes for P0843

























User Submitted Video

Need more information about the P0843 code?

Need more information on how to fix the P0843 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0843 code diagnosed by a professional: Find a repair shop in your area

Code P0843 Information for Specific Makes

  • P0843 Acura — Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High
  • P0843 Buick — Transmission Fluid Pressure Switch 1 Circuit High Voltage
  • P0843 Cadillac — Transmission Fluid Pressure Switch 1 Circuit High Voltage
  • P0843 Chevrolet — Transmission Fluid Pressure Switch 1 Circuit High Voltage
  • P0843 Dodge — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
  • P0843 GMC — Transmission Fluid Pressure Switch 1 Circuit High Voltage
  • P0843 Honda — Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High
  • P0843 Mercedes-Benz — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
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 Code

No Frequently Asked Questions about P0843 Code found.

Discuss the causes and fixes for P0843 OBDII Code

Submit a New Comment

Code P0843 comments

No comments found for this page.