OBD-II Generic Error Code P0843: How to Fix It

Q: What does error code P0843 mean?

P0843 means the transmission fluid pressure sensor/switch A circuit is reading a voltage higher than the specified range. This indicates a potential issue with the sensor, wiring, or transmission fluid system.

Q: Can I drive with a P0843 code?

It is not recommended. The vehicle may go into limp mode, causing poor performance and potential damage to the transmission. Have it diagnosed and repaired as soon as possible.

Q: How much does it cost to fix P0843?

Costs vary. Replacing a transmission pressure sensor can cost $150-$400 including parts and labor. DIY repair is cheaper but requires basic tools and know-how.

Q: What causes P0843?

Common causes include a faulty transmission fluid pressure sensor, wiring issues, low or dirty transmission fluid, or a malfunctioning transmission control module.

Q: Can low transmission fluid cause P0843?

Yes, low fluid can cause erratic pressure readings and trigger P0843. Always check fluid level first.

Abstract

Error code P0843 indicates that the transmission fluid pressure sensor or switch A is sending a signal that is higher than expected by the engine control module (ECM). This can cause harsh shifting, slipping, or limp mode. The issue is often caused by a faulty sensor, wiring problems, or low/contaminated transmission fluid.