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[Solved] Renault Clio 4 Battery Charging Failure Issue: Alternator, Sensor & Error B120F-81 Solutions

axmarek 98457 32
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
  • #31 17971574
    michal.inowroclaw
    Level 9  
    Hello,
    Was there a gas / power cut off during the charging error, and the problem disappeared after turning off and restarting the car?
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  • #32 17978396
    axmarek
    Level 10  
    michal.inowroclaw wrote:
    Hello,
    Was there a gas / power cut off during the charging error, and the problem disappeared after turning off and restarting the car?

    Apart from the error that was present all the time, everything else worked without problems.

    Added after 2 [minutes]:

    I come back to the topic.

    Please give me a hint. Does the UPC module that I replaced due to the battery charging failure have anything to do with the air conditioning? Today I was in the air conditioning service - sealed system, supplemented factor. Air conditioning does not cool. The diagnostics include an error in the compressor relay circuit (I have covered the diode and fuse in the fuse box earlier) and the fluid pressure sensor error (shows a pressure of 59bar). In the workshop, I was suggested to replace the fluid pressure sensor. But I'd rather be sure before spending money again :)
  • #33 17983111
    axmarek
    Level 10  
    Damaged wire in the harness - I haven't found where yet. I disconnected the factory cable and pulled the makeshift and the problem was gone, there was no battery charging error, start-stop and the cruise control works.

    Air conditioning not working problem remained it may be a common charging fault problem.

    Please see this thread
    https://www.elektroda.pl/rtvforum/topic3585271.html#17983100

Topic summary

The discussion revolves around a persistent "Battery charging failure" error in a Renault Clio 4, despite replacing the alternator, battery, and current sensor. The error code B120F-81 indicates an issue with the alternator UPC line. Various troubleshooting steps were suggested, including checking the LIN bus voltage, inspecting the UPC module, and verifying wiring integrity. The user ultimately resolved the issue by replacing a faulty cable connected to the alternator-UPC line, which eliminated the error and restored functionality to the start-stop system and cruise control. However, air conditioning issues persisted, potentially linked to a separate fault in the system.
Summary generated by the language model.
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