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Engine-Codes - Generic - P0843

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

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0843 Possible Causes

What does this mean?
  • Low transmission fluid level
  • Dirty transmission fluid
  • Faulty Transmission Fluid Pressure Sensor/Switch 'A'
  • Transmission Fluid Pressure Sensor/Switch 'A' harness or connectors
  • Transmission Fluid Pressure Sensor/Switch 'A' circuit is open or shorted
  • Transmission internal mechanical problem

How is the P0843 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0843 code

Labor: 1.0

The cost to diagnose the P0843 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0843 Meaning

The Torque Converter Clutch (TCC) release switch is part of the automatic Transmission Fluid Pressure (TFP) manual valve position switch. The TFP manual valve position switch is mounted to the transmission valve body. The TCC release switch is a normally-closed switch.
When the TCC is released, TCC release fluid pressure opens the TCC release switch which opens the TCC release pressure circuit. When the voltage on the circuit is high (switch open), the Powertrain Control Module (PCM) recognizes that the TCC is no longer engaged.

More Information

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Information for specific makes

  • P0843 ACURA Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High  ▶
  • P0843 DODGE Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
  • P0843 HONDA Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High  ▶
  • P0843 MERCEDES-BENZ Transmission Fluid Pressure Sensor/Switch 'A' Circuit High

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