AutoCodes – Honda – P0843 Honda

P0843 Honda 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 Honda 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 66,795

How popular is this code, among other codes? Medium

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 Aug 03, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0843 Honda 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 Honda - Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High - AutoCodes.com — P0843 Honda Code - Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High

What does this mean?

What are the Possible Causes of the DTC P0843 Honda?

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 Honda?

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 Honda 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.

Need more information about the P0843 Honda code?

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

Need Help with the Code?

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

Information for Specific Honda Models

P0843 2016 Honda CR-V — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
P0843 2017 Honda CR-V — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
P0843 2018 Honda CR-V — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
P0843 2019 Honda CR-V — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
P0843 2020 Honda CR-V — Transmission Fluid Pressure Sensor/Switch 'A' Circuit High
P0843 2021 Honda CR-V — 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 Honda Code

1. What are the common symptoms of OBDII code P0843 in a Honda related to the Transmission Fluid Pressure Switch 'A' 2nd Clutch Circuit High?

- Common symptoms include harsh shifting, transmission slippage, transmission overheating, and an illuminated Check Engine Light.

2. What can cause the OBDII code P0843 to trigger in a Honda?

- The code P0843 can be triggered by issues with the transmission fluid pressure switch 'A', such as faulty wiring, a defective pressure switch, or low transmission fluid levels.

3. How serious is OBDII code P0843 in a Honda?

- OBDII code P0843 should be addressed promptly to prevent potential damage to the transmission and ensure the vehicle operates properly.

4. How can I diagnose the OBDII code P0843 in my Honda?

- Diagnosis typically involves using a scan tool to read the code, checking the transmission fluid level and condition, and inspecting the wiring and connections related to the transmission fluid pressure switch 'A'.

5. Can I continue driving my Honda with OBDII code P0843 present?

- It is not recommended to continue driving the vehicle with OBDII code P0843 present, as it can lead to further transmission damage and potentially leave you stranded.

6. What are some repair tips for addressing OBDII code P0843 in a Honda?

- Repair tips include checking and replacing the transmission fluid pressure switch 'A', inspecting and repairing any damaged wiring, and ensuring the transmission fluid is at the correct level and in good condition.

7. How much does it typically cost to repair OBDII code P0843 in a Honda?

- The cost of repairing OBDII code P0843 can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix OBDII code P0843 in a Honda?

- While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P0843, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

9. How long does it take to repair OBDII code P0843 in a Honda?

- The repair time for OBDII code P0843 can vary depending on the exact cause of the issue and the extent of the repairs needed. It may take a few hours to a full day to complete the repair.

10. Are there any preventative maintenance measures to avoid OBDII code P0843 in a Honda?

- Regularly checking and maintaining proper transmission fluid levels, ensuring the transmission is serviced according to the manufacturer's recommendations, and addressing any transmission issues promptly can help prevent OBDII code P0843 in a Honda.