P0841 - OBD Trouble Code

<<See All OBD Codes

Are you experiencing fall in fuel economy of your vehicle? Did you recently face harsh shifting and slippage? If your answer is YES, then chances are pretty high that your vehicle is set to OBD error code P0841. This error code is set up due to number of causes that we have listed out in the subsequent sections for you. P0841 is an OBD-II code which indicates issues with Transmission Fluid Pressure Sensor/Switch "A" Circuit.

Wondering what is this transmission fluid pressure switch and what is its purpose in your vehicle? Well, the purpose of the transmission fluid pressure switch is to allow your vehicle’s engine control module or transmission control module to make use of the hydraulic fluid to keep the clutches in the transmission engaged and initiate smoother shift while driving. OBD error code P0841 will be set by the vehicle’s PCM/TCM when it detects an issue with the hydraulic clutch or the transmission fluid pressure sensor circuit “A”.

What causes this problem with the Transmission Fluid Pressure Sensor/Switch "A" Circuit Range/Performance?

• Internal mechanical issues with the transmission
• Open or shorted transmission fluid pressure sensor circuit “A”
• Faulty transmission fluid pressure sensor harnesses or connectors
• Malfunctioning transmission fluid pressure sensor/switch “A”
• Possible open in the TFPS sensor circuit
• TFPS sensor having a short or voltage
• Failing TFPS sensor
• Possibly failing Powertrain Control Module
• Bad TFPS circuit
• Extremely low transmission fluid level
• Poor or dirty transmission fluid

1. Transmission Control Module - Facing OBD error code P0841? Chances are that you might need to undergo TCM replacement. We have in stock high end transmission control module for every make and model on the Canadian roads.
2. Digital Voltmeter - if you are in need of few diagnostic tools to become that DIY guy, then you can simply browse through website and get your hands on the best diagnostic tools.
3. Powertrain Control Module - If you need powertrain control module to fix this problem, all you need to do is to browse through our website. You can find the most budget friendly PCM’s with us.
4. Transmission Fluid Pressure Sensor - Looking for transmission fluid pressure sensor to fix this error code P0841? If yes, then we have you sorted. We have in stock high end transmission fluid pressure sensor to fix all your vehicle problems.
5. Automatic Transmission Module - Well, if you really wish to get rid of this problem you might need to undergo automatic transmission module replacements. You can easily find them with us.
6. Engine Control Module - chances of your ECM going wrong is quite low for this issue, but if you still face problems with it you can find quality ECM’s with us.
7. Transmission Shift Solenoid - Browse through our range of best transmission shift solenoids to find the right one for your car.

It is essential to know the symptoms of an issue as only then you will be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0841 here:

Common Symptoms

• Fall in fuel economy
• Difficulty in transmission shifting
• Flashing of check engine light
• Hard shifting
• Slippage
• Vehicle entering into the limp mode

Here are some ways with the help of which you will be able to correct the OBD Code P0841:

• If you smell a burnt transmission fluid, then remove the transmission pan and check the clutch and other parts for any debris.
• In case you come across any form of contaminants in the transmission pan, then you will need to undergo a complete rebuilt.
• Also replace the fluid flush and torque converter to get your transmission working well as before.

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade Transmission Fluid Pressure Sensor, engine control module, PCM, Powertrain Control Module, Transmission Control Module, transmission pan, clutch, shift solenoid and a lot more for our precious customers.

Here are some steps which you should follow in order to diagnose this P0841 fault code:

• Your first step should be to check the technical service bulletins, specific to your vehicle’s make and model. This will not only help you to understand the specific issue but also help you to understand steps on how to fix it. Believe us it will save you a lot of time and money while diagnosing not only this code but for any other code too. Also, you should start your diagnosis with all the power related error code or with the multiple code diagnosis as it will help you in understanding the reasons behind the error code P0841.
• Next on your list to do is to locate transmission fluid pressure sensor/switch on your vehicle to begin with the specific diagnosis. It will likely be attached to your vehicle’s valve body side inside the transmission. Once you figure out its location, next step for you to do is to check the connectors and wirings for any loose ends, bare wires, rubbing, scraping, burn spots or melted plastics.
• Now, take the connector apart and inspect the terminals very carefully inside the connector. Make sure that they don’t look burnt or have a green tint indicating corrosion. Make use of an electrical contact cleaner and a plastic bristle brush if cleaning of the terminals needs to be cleaned. Let dry and apply electrical grease where the terminals contact.
• Now, take hold of a scan tool and clear all the existing trouble code from memory, and check if the P0841 code returns.
• In case it does not then the problem was mainly with the connectors only. In case it does return then the connections were most likely your problem. This is a common area of concern for this code, as the external transmission connections have the greatest number of issues with corrosion. In case the code returns, then you will need to inspect the TFPS sensor and all the related connectors and circuits. Turn off the key and disconnect the electrical connectors at the TFPS sensor.
• Now, connect the digital voltmeter either to the ground or to the low reference terminal at the TFPS sensor wiring harness connector. Also connect the red lead of the DVOM to the signal terminals at the TFPS sensor wiring harness connector.
• Next step is to turn on the key and check for the manufacturer’s specifications. Make sure that the voltmeter reads either 12 volts or 5 volts. Wiggle the connections to check if they change. In case the voltage is incorrect, repair the power or ground wire, or replace the PCM/TCM.
• Now, if this test is passed then connect one lead of an ohmmeter to the signal terminal at the TFPS sensor and the other lead to the ground or low reference terminal at the sensor.
• Next, check for the manufacturer’s specifications on the resistance of the sensor to accurately test the resistance to pressure when there is no pressure applied to it. Again, wiggle the connector at the Transmission Fluid Pressure Sensor/Switch while monitoring the resistance. If the ohmmeter readings do not pass, replace the TFPS.
• In case you still continue to get the P0841 error code in spite of passing all these prior tests then it is signalling a failed TFPS sensor, although a failed PCM/TCM could not be ruled out, nor could internal transmission malfunctions until the TFPS sensor had been replaced. If you are in doubt, we suggest you to seek help from a trained automotive diagnostician. PCM/TCMs must be programmed or calibrated to the vehicle in order to be installed correctly.

Common Mistakes When Diagnosing the P0841 Code

The most common misdiagnosis involves overlooking the electronic control solenoid, transmission pressure sensor and system wirings for any malfunctioning.

Another common error is to replace the high-pressure pumps even though they are perfectly fine and need no replacement.