AutoCodes – Acura – P0843 Acura

P0843 Acura Code - Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High

Quick Answer

Transmission fluid pressure switch A (2nd clutch) is installed in the hydraulic pressure circuit to the 2nd clutch. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty 2nd Clutch Transmission Fluid Pressure Switch. 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 Acura indicates Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty 2nd Clutch Transmission Fluid Pressure Switch.
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 19,805

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 May 10, 2019

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0843 Acura Description

Transmission fluid pressure switch A (2nd clutch) is installed in the hydraulic pressure circuit to the 2nd clutch. When hydraulic pressure is supplied to the 2nd clutch, the switch is turned ON. When hydraulic pressure is not supplied to the 2nd clutch, the switch is turned OFF. The signal from transmission fluid pressure switch A (2nd clutch) is input to the Powertrain Control Module (PCM). The PCM detects the hydraulic pressure supply conditions at the gear change to 2nd gear (1st to 2nd, 3rd to 2nd) to reduce the shock that occurs at the gear change. If transmission fluid pressure switch A (2nd clutch) is OFF while driving the vehicle with the rotation speed ratio of the input/output pulses is that of 2nd gear, the PCM detects a transmission fluid pressure switch A (2nd clutch) failure and stores a Diagnostic Trouble Code (DTC).

OBDII Code P0843 Acura - Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High - AutoCodes.com — P0843 Acura Code - Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High

What does this mean?

What are the Possible Causes of the DTC P0843 Acura?

Low transmission fluid level
Dirty transmission fluid
Faulty 2nd Clutch Transmission Fluid Pressure Switch
2nd Clutch Transmission Fluid Pressure Switch harness or connectors
T2nd Clutch Transmission Fluid Pressure Switch circuit is open or shorted
Transmission internal mechanical problem

How to Fix the DTC P0843 Acura?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0843 Acura 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.

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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 Acura Code

What are common symptoms of OBDII code P0843 in an Acura?

Common symptoms include harsh shifting, transmission slipping, difficulty engaging gears, and illuminated warning lights on the dashboard.

What are possible causes of OBDII code P0843 in an Acura?

Possible causes include a faulty transmission fluid pressure switch, damaged wiring or connectors in the circuit, low transmission fluid levels, or internal transmission issues.

How can I diagnose OBDII code P0843 in my Acura?

Diagnosing this code typically involves using a scan tool to read the code, checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, and testing the transmission fluid pressure switch.

Can I continue driving my Acura with OBDII code P0843?

It is not recommended to continue driving your Acura with this code present, as it can lead to further transmission damage and potentially unsafe driving conditions.

How can I repair OBDII code P0843 in my Acura?

Repairing this code may involve replacing the transmission fluid pressure switch, repairing or replacing damaged wiring or connectors, ensuring proper transmission fluid levels, and resetting the fault codes.

Is it possible to reset OBDII code P0843 in an Acura without repairs?

While you can clear the code using a scan tool, it is recommended to diagnose and repair the underlying issue to prevent further damage to the transmission.

Can a DIY enthusiast fix OBDII code P0843 in an Acura?

Depending on your experience and tools available, you may be able to replace the transmission fluid pressure switch or inspect wiring, but more complex repairs may require professional expertise.

What are the potential risks of ignoring OBDII code P0843 in an Acura?

Ignoring this code can lead to transmission failure, increased repair costs, and compromised vehicle performance and safety.

Should I seek professional help for OBDII code P0843 in my Acura?

For proper diagnosis and repair of this code, it is recommended to seek assistance from a qualified mechanic or dealership with experience in Acura transmissions.