Ford Ecosport P0841: Meaning, Causes, + Diagnosis

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P0841 Ford Ecosport

  • PCM– Powertrain Control Module, this is the main computer module with the engine and transmission control in one unit. 
  • TCM– Transmission Control Module, the TCM controls the shifting of the transmission and is separate from the engine control module. Your Ford Ecosport will either have a PCM or a TCM.  And, for the purposes of this article, they are interchangeable.
  • TFPS– Transmission Fluid Pressure Sensor

    • P0841 Definition:  Transmission Fluid Pressure Sensor/Switch “A” Range/Performance

    P0841 Definition: Ford Ecosport

    Here’s the definition of P0841 for the Ford Ecosport broken down by its individual parts. 

    Transmission Fluid Pressure Sensor/Switch

    The TFPS has two primary jobs:

    1. Convert the transmission fluid pressure into a signal that the PCM (or TCM) can use to control shifts.
    2. Verifies that the PCM/TCM’s request for a transmission shift has occurred.

    Circuit “A” Range/Performance

    The TFPS converts the hydraulic pressure data into a voltage signal that your Ecosport’s TCM/PCM can use to control the transmission.  P0841 occurs when this signal is out of the normal operating range for this signal.

    P0841 Symptoms:  Ford Ecosport

    Here are the most common symptoms associated with P0841:

    • Limp Mode– Your Ecosport will shift differently and won’t have access to all of its gears.
    • Check Engine Light– There will often be other codes that occur with P0841.  They will usually be related to voltage and power.
    • Erratic Shifting– Shifts may feel soft (RPM slowly drops during the shift), or they may feel too harsh (abrupt drop in RPM).

    Ford Ecosport P0841 Causes + Diagnosis

    P0841 Diagnosis Ecosport

    Diagnosing P0841 in the Ford Ecosport can be challenging, due to the location of the TFPS sensor and the wiring associated with it.

    1. Check for Other Codes and TSB’s

    The first thing you want to do is check for other diagnostic codes.  They can provide valuable clues to what’s going on inside your transmission.

    TSB’s are technical service bulletins.  Ford uses them out to deal with common and well-known vehicular issues.  Check to see if there are any related to your problem.  You can get them from the NHTSA website.

    2. Inspect the TFPS Wiring

    The next thing you’re going to want to do is inspect the wiring going to your Ecosport’s TFPS.  If it’s burnt or damaged, you’ll need to replace/repair it.

    After that, clear your Ecosport’s trouble codes and see if P0841comes back.9

    Whether or not you’re going to be able to access the TFPS is going to determine whether most people can continue diagnosing P0841.  Sometimes the TFPS can be accessed from the outside of the transmission.  You may need to open the transmission.

    Wiring issues are the most common cause of P0841.  Take your time and make sure that the harness is in good shape.

    3. Other Causes

    While a bad TFPS sensor is highly likely, make sure that the voltage going to it is correct and doesn’t change when wiggling the harness before replacing it.

    Conclusion

    Diagnosing P0841 is pretty straightforward.  The real issue is getting to the wiring and TFPS.  Good luck fixing your Ecosport!