This OBD2 code is commonly used on Chrysler Corp. and VW vehicles, and it concerns the transmission pump. If the ECU detects that it is not operating according to preprogrammed parameters, it will trigger a DTC P0943.
How severe is the code?
A P0943 diagnostic code is extremely severe, as it means the transmission pump is not producing enough hydraulic pressure to operate the transmission safely. This can lead to catastrophic damage to the transmission, so it must be diagnosed immediately.
Symptoms
Symptoms of a P0943 include:
- Delayed gear shifts
- The transmission refuses to shift gears
Causes
- Low transmission fluid level
- Dirty fluid/filter
- Blocked or loose transmission cooler lines/filter
- Transmission pump failure
- One of the fluid passages inside the transmission body/valve is obstructed
- Non-functional transmission pressure regulator valve
How to diagnose the code?
The diagnostic process for an OBDII P0943 fault code involves performing a transmission line pressure test to determine if the transmission pump is functioning correctly. If it is not, it will need to be replaced.
What repairs will fix P0943?
- Change the transmission fluid
- Flush the transmission
- Replace the cooling line filter
- Replace the transmission pump
- Replace the transmission regulator valve
- Replace, rebuild, or install a remanufactured transmission