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[Solved] Citroen C4 Picasso - Electric handheld does not pass calibration

Seether 56505 12
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  • #1 17092974
    Seether
    Level 15  
    Posts: 101
    Help: 16
    Rate: 117
    Hello!
    Since yesterday I have a problem with an electric handheld.
    After parking the car and trying to turn it on, an error occurred.
    After connecting the computer, I read the error:
    "Brake hose".
    I removed the error but it did not help.
    I tried to calibrate but during it appears the message Error - ignition off.
    Citroen C4 Picasso - Electric handheld does not pass calibration Citroen C4 Picasso - Electric handheld does not pass calibration

    Fortunately, I was able to turn on the brake setting in the "Service" function, also I can move the car.
    Question where should I start looking?
    Will a coiler or electrician be guilty?

    edit:
    I replaced the stop sensor - it did not do anything.
    The error only occurs when "tightening".
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  • #2 17094797
    jurekk55
    Level 36  
    Posts: 3698
    Help: 182
    Rate: 1575
    Wurt, Autocom .....

    For this car we use Lexia or Diagbox, depending on the year. Error with description - Brake line - I leave without comment on the suitability of this device in case of your problem
  • #3 17094879
    mar.wo
    Level 15  
    Posts: 147
    Help: 10
    Rate: 81
    So first of all profi diagnosis and then we will try to help.
    Check the thickness of the blocks back.
  • #4 17095390
    jurekk55
    Level 36  
    Posts: 3698
    Help: 182
    Rate: 1575
    Mechanics should be impeccable, it is a waste of time for half measures.
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  • #5 17095706
    Seether
    Level 15  
    Posts: 101
    Help: 16
    Rate: 117
    Thanks for the response!
    Unfortunately, I only had such equipment over the weekend.
    The blocks are thick - 2.5 thousand. driven.
    I ordered the entire brake module today.
    From what I see it is the whole engine with control.
    Just one more question - Is it possible to replace this module without a channel?
    From what I know, it is necessary to remove the driver's seat and set the mechanism in the service position.

    I will describe the next steps as soon as I get this module.
  • #6 17096241
    kowal162
    Level 17  
    Posts: 181
    Help: 15
    Rate: 94
    And you only cost yourself. Go to someone with a diagbox and it will be cheaper for you than combining and shooting what broke down.
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  • #7 17096588
    Seether
    Level 15  
    Posts: 101
    Help: 16
    Rate: 117
    You're probably right, buddy.
    The module cost only PLN 100, it is also not a fortune.
    Replacing the module is also not a problem with what I saw.
    The links and terminals are walking. The motor can be controlled in two directions, only an error pops up at the end of the "puff".
    As exchange does not give anything, I will go somewhere where they have Lexia.
  • #8 17107585
    Seether
    Level 15  
    Posts: 101
    Help: 16
    Rate: 117
    I'm betting because I already have a better diagnosis.
    After connecting, Lexia shows errors:
    C155AFSE not calibrated: stroke - force characteristic
    C1550 Brake cable fault
    I paste photos with the description of the error.
    It looks like the links were too long ...
    The blocks are thick. Can you regulate these links?

    Citroen C4 Picasso - Electric handheld does not pass calibration Citroen C4 Picasso - Electric handheld does not pass calibration
  • #9 17107625
    vodiczka
    Level 43  
    Posts: 30170
    Help: 1183
    Rate: 4288
    Sorry for the off topic but I could not resist:
    They used to be hand-operated and who bothered it :?:
  • #10 17108219
    kowal162
    Level 17  
    Posts: 181
    Help: 15
    Rate: 94
    You have a mistake from manual calibration you must probably connect it by lexie.
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  • #11 17108317
    Seether
    Level 15  
    Posts: 101
    Help: 16
    Rate: 117
    Does not pass lexia calibration. And these two mistakes appear all the time. The first one was the one from the links and I mostly mean it. It only appeared from the calibration when I tried to calibrate the brake.
  • Helpful post
    #12 17111008
    WBART
    Level 19  
    Posts: 387
    Help: 20
    Rate: 156
    Or maybe someone will finally check these links because they are blurred by power.
  • #13 17168343
    Seether
    Level 15  
    Posts: 101
    Help: 16
    Rate: 117
    Problem solved - fixed links and clamp.
    Thank you all for your help.
    As it turns out, Autocom is not so bad - well pointed out the error and even knew how to calibrate the system :)

    Thanks again!
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Topic summary

✨ The discussion revolves around a calibration issue with the electric handheld system in a Citroen C4 Picasso, where an error related to the "brake hose" was encountered. The user attempted to clear the error and calibrate the system but faced persistent issues, including an "ignition off" message during calibration. Various responses suggested performing a professional diagnosis using tools like Lexia or Diagbox, checking the brake components, and ensuring the mechanics are in good condition. The user replaced the stop sensor and ordered a new brake module, later confirming that the calibration errors were due to improperly adjusted links. Ultimately, the problem was resolved by fixing the links and clamp, with Autocom proving effective in diagnosing and calibrating the system.
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FAQ

TL;DR: Citroën C4 Picasso EPB that won’t calibrate usually flags 2 faults; "Lexia shows errors C155A and C1550." Repair stretched cables or a sticky caliper, then recalibrate with Lexia/Diagbox. This FAQ helps C4 Picasso owners and techs fix calibration failures fast. [Elektroda, Seether, post #17107585]

Why it matters: It speeds diagnosis and avoids unnecessary EPB module swaps for C4 Picasso owners and workshops.

Quick Facts

What does an EPB calibration failure mean on a Citroën C4 Picasso?

It means the EPB couldn’t learn its stroke–force profile. Lexia reports C155A (FSE not calibrated) and often C1550 for the cable. That points to mechanical drag or length issues at the cables or rear caliper. Fix the mechanical fault, then run calibration with Lexia or Diagbox. Electronic parts rarely help when those codes appear. “Lexia shows errors C155A and C1550.” [Elektroda, Seether, post #17107585]

What do codes C155A and C1550 point to?

C155A means the EPB stroke–force map is not calibrated. C1550 flags a brake cable fault. Together they indicate cable length or a binding caliper. Repair the mechanical issue, then execute the EPB calibration routine. The poster saw both codes during repeated calibration attempts. [Elektroda, Seether, post #17107585]

How do I fix a C4 Picasso EPB that won’t calibrate?

  1. Inspect and repair the parking-brake cables (“links”) and the affected rear caliper.
  2. Place the EPB in Service mode, free any seized clamp, and verify smooth travel.
  3. Run EPB calibration with Lexia/Diagbox or an equivalent and confirm no errors. “Problem solved — fixed links and clamp.” [Elektroda, Seether, post #17168343]

Which diagnostic tool should I use—Autocom, Lexia, or Diagbox?

Use PSA-native tools. “For this car we use Lexia or Diagbox, depending on the year.” Generic tools can mislabel faults, for example as “Brake line.” Lexia/Diagbox include correct EPB routines and fault names. This improves accuracy and avoids wasted parts. [Elektroda, jurekk55, post #17094797]

Will Autocom work for calibration anyway?

In this case, Autocom found the fault and ran calibration. The owner reported, “Autocom … knew how to calibrate the system.” Keep Lexia/Diagbox as your primary option for PSA vehicles. Use Autocom if you verify it supports EPB routines on your model year. [Elektroda, Seether, post #17168343]

Do I need to replace the EPB module to solve C155A/C1550?

Not by default. The successful fix here was repairing cables and the caliper, then calibrating. No module swap was needed in the resolution. Address cables and clamp condition before ordering electronics. “Problem solved — fixed links and clamp.” [Elektroda, Seether, post #17168343]

How can I move the car or release the brake when the EPB errors out?

Use the tool’s Service function to set or release the EPB. The owner enabled “brake setting” in Service mode to move the car when errors blocked operation. Secure the vehicle on level ground during release. Reapply the brake, then address the fault and recalibrate. [Elektroda, Seether, post #17092974]

Do pad thickness or recent pad changes affect EPB calibration?

Pad condition affects clamp travel, but here pads were nearly new. The owner had rear pads with about 2,500 km of use. Calibration still failed until the cables and caliper were repaired. Check cables and clamp movement first before blaming pad wear. [Elektroda, Seether, post #17095706]

What’s the first mechanical check before running calibration?

Confirm the rear brake hardware is fault‑free. “Mechanics should be impeccable.” Inspect parking‑brake cables for stretch or fraying. Verify the caliper clamp moves freely. Correct faults before running calibration. This avoids wasted time and parts. [Elektroda, jurekk55, post #17095390]

Why does calibration abort with “Ignition off” message?

During early attempts, the tool aborted with “Error – ignition off.” That indicates the procedure didn’t detect the required state. The owner then used the Service function to manage the brake. Ensure ignition is on and retry with correct service steps. [Elektroda, Seether, post #17092974]

Can the EPB cables be adjusted, or must they be repaired?

In this case, the solution was to repair the cables and the clamp, then recalibrate. That cleared the calibration and cable faults. Treat suspect cables as a mechanical repair task rather than a software adjustment. Once movement is smooth, run the EPB calibration routine. [Elektroda, Seether, post #17168343]

The motor runs both directions but errors at final tightening—what does that indicate?

That behavior suggests the actuator works, but travel ends against resistance. The motor ran both ways, yet an error appeared during final clamp. Inspect cables and the caliper before replacing the module. Fix the mechanical issue, then recalibrate. [Elektroda, Seether, post #17096588]

Is professional diagnosis worth it compared to guessing parts?

Yes. “Go to someone with a Diagbox and it will be cheaper.” PSA-native tools read correct faults and run EPB routines. Accurate diagnostics prevent unnecessary module purchases. Book time with a shop using Lexia or Diagbox. [Elektroda, kowal162, post #17096241]

How did this case conclude and what can I learn from it?

The car was fixed by repairing the parking‑brake cables and a sticking caliper. After that, calibration succeeded using the diagnostic tool. The owner summed it up: “Problem solved — fixed links and clamp.” Try this path before replacing the EPB module. [Elektroda, Seether, post #17168343]
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