P0841 Fault Code

Long Description

Fault code P1206 is logged when the transmission control module (TCM) has detected a problem with the transmission fluid pressure sensor.

The transmission fluid pressure sensor is responsible for monitoring the fluid pressure within the transmission, as its name suggests. The signal is then sent to the control module, which then regulates the flow of transmission fluid.

This information is used to monitor the health of the transmission, as well as help optimize gear shifting in automatics.

All manufacturers can suffer from this generic fault code, but brands like Dodge, Volkswagen, Nissan, and Subaru are some of the most commonly reported.

Other Signs of This Problem

Unlike actual transmission problems, there will typically be very few signs of a faulty transmission fluid pressure sensor.

One of the most common and obvious symptoms is the presence of the Check Engine light on the dashboard.

There can sometimes be more noticeable signs though. These can include problematic gear shifting. This can include erratic shifts and, in some cases, the inability of the gearbox to shift at all.

There may be additional similar fault codes logged. Be sure to look out for codes like P0842, P0843, and P0844.

What Could Be The Problem?

There can be a bevy of causes when it comes to a malfunctioning sensor. These can typically be broken down into two main issues, though.

The first culprit is typically any problem with the sensor itself or its circuit. These can include a faulty circuit, damaged wires, and loose connections in the circuit.

Alternatively, it is possible that the sensor is monitoring a problem. In this case, it is possible for the flow of transmission fluid to be blocked. This can be caused by damage or contamination in the transmission fluid passages.

A transmission with incorrect fluid levels can also contribute to the problem.

In rare cases, this can be caused by a faulty TCM or PCM. However, this will likely result in various additional fault codes being logged.

Fixes

The first step in fixing this fault code is determining whether there is an actual problem in the transmission or if the transmission fluid pressure sensor is at fault.

Checking for a faulty transmission fluid pressure sensor should be the main priority. If the sensor is defective, it needs to be replaced.

The next step is to check the sensor circuit for electrical faults like damaged wires or loose connections. Any issues in the circuit need to be fixed.

If the sensor circuit is free of any faults, the transmission needs to be checked. The fluid needs to be topped up to the prescribed level with fresh transmission fluid.

The fluid passages need to be checked and cleaned of any obstructions or blockages.

If the control modules are defective or running on outdated software, this needs to be fixed.

Seriousness

Fault code P0841 is a moderately serious problem. While it may not affect drivability in every case, it has the potential to hide more serious problems with the transmission. If the problem does cause gear-shifting issues, it should be considered a more serious problem.

Either way, it is recommended to have this fault code fixed as soon as possible.