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[Solved] Citroen C5 MKII LIFT 2.0HDI: AISIN AM6 Auto Transmission Jerks in Reverse Issue - Solutions?

Lysyxmv6 20268 11
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  • #1 17253813
    Lysyxmv6
    Level 12  
    Posts: 192
    Rate: 60
    Hello
    Citroen C5 MKII LIFT 2.0HDI, automatic transmission AISIN AM6, mileage 258 thousand.
    The car changes gears smoothly.
    Before driving and warming up the engine, switching to D and R at a standstill, there are no disturbing symptoms, but when I ride the car and stop, I give R a strong blow, only it happens on R.
    After 10 minutes I get in the car, drive R and there is no more impact.

    Maybe someone will tell me where the problem is?
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  • #2 17254476
    romuald-f
    A/T specialist  
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    After replacing the solenoid, did you calibrate the transmission with a computer?
  • #3 17254694
    Lysyxmv6
    Level 12  
    Posts: 192
    Rate: 60
    Thanks buddy for your interest in the topic.
    I haven't replaced any solenoid valve, I don't know if it's time or oil change will help?
    Which one is the solenoid valve in the picture?
    Citroen C5 MKII LIFT 2.0HDI: AISIN AM6 Auto Transmission Jerks in Reverse Issue - Solutions?
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  • #5 17255662
    Lysyxmv6
    Level 12  
    Posts: 192
    Rate: 60
    As you have noticed, this is my topic :) but it was about another car :) where I solved the problem and shared my experience :)
    You don't want to say that S1 or S2 are reverse solenoid valves?
    Someone somewhere suggests maybe a brake band ???
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    #6 17255934
    romuald-f
    A/T specialist  
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    After all, reverse gear is, but there is a problem with a jerk after turning R. First, do a calibration with the scanner.
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  • #7 17255965
    Lysyxmv6
    Level 12  
    Posts: 192
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    I don't have a scanner, I only have Lexie.
    Do any of the listed S1 and S2 to reverse solenoid valves?
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    #8 17256277
    romuald-f
    A/T specialist  
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    What are you hooking on these solenoid valves? There is no solenoid valve directly responsible for reverse gear.
  • #9 17256316
    Lysyxmv6
    Level 12  
    Posts: 192
    Rate: 60
    I clung because I thought it occurs :) just like in other gears.
    It would be easier to dismantle it and give it a good one :)
    Lexia do the calibration of the box?

    By the way, what is responsible for jerking on R?
  • #10 17256524
    romuald-f
    A/T specialist  
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    ..... It would be simpler to disassemble it and give it a working ........
    If you think that ASB repair involves replacing solenoid valves, you are a C5 user, not an ASB mechanic.
  • #11 17256540
    Lysyxmv6
    Level 12  
    Posts: 192
    Rate: 60
    I'm not a mechanic, if I were him, I wouldn't ask for advice.
    So I'm asking how to do it? :)

    Added after 4 [minutes]:

    romuald-f wrote:
    After replacing the solenoid, did you calibrate the transmission with a computer?


    You write here for yourself if after replacing the valve I did the calibration ..

    So I conclude that there is a valve that is responsible for it ...

    Added after 12 [hours] 51 [minutes]:

    Calibration is teaching the chest?
    And is it done at a standstill or while driving?
  • #12 17260580
    Lysyxmv6
    Level 12  
    Posts: 192
    Rate: 60
    .............
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Topic summary

✨ The discussion revolves around a Citroen C5 MKII LIFT 2.0HDI experiencing jerking issues when shifting into reverse with an AISIN AM6 automatic transmission. The user reports that the car operates smoothly in other gears and that the jerking occurs only after driving for a while. Suggestions include checking the solenoid valves, performing a transmission calibration with a scanner, and considering the possibility of a brake band issue. The user seeks clarification on the specific solenoid valves related to reverse gear and the calibration process, expressing uncertainty about the mechanical aspects of the transmission.
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FAQ

TL;DR: 258,000 km C5 AM6 shows a hot Reverse clunk that fades after 10 minutes; "only it happens on R." This FAQ explains scanner calibration and simple checks to restore smooth engagement. [Elektroda, Lysyxmv6, post #17253813]

Why it matters: It helps Citroën C5 MKII LIFT 2.0 HDi owners quickly triage and fix AM6 Reverse jerks without guesswork.

Quick Facts

Is there a dedicated Reverse solenoid on the Aisin AM6?

No. Reverse engagement on the AM6 is not controlled by a single solenoid. As one expert put it, “There is no solenoid valve directly responsible for reverse gear.” That means an R‑only jerk will not be solved by swapping a mythical “Reverse solenoid.” Focus on diagnosis rather than guessing a single valve. [Elektroda, romuald-f, post #17256277]

Why does my C5 jerk only when selecting R after a drive, not when cold?

In the reported case, gear changes were smooth before warming, and only Reverse produced a strong blow after driving. The behavior then disappeared after about 10 minutes with the car off. This pattern points to condition‑dependent behavior, not a constant fault. Use the calibration guidance below as your first action. [Elektroda, Lysyxmv6, post #17253813]

Whats the first step to fix a Reverse clunk on AM6?

Run a transmission calibration using a scanner. The guidance was clear: “First, do a calibration with the scanner.” How-To:
  1. Warm the drivetrain to normal temperature.
  2. Connect a compatible scanner and select gearbox adaptation/calibration.
  3. Follow on‑screen prompts to completion, then recheck Reverse engagement. This establishes baseline control parameters before any parts decisions. [Elektroda, romuald-f, post #17255934]

Do I need to calibrate after replacing any solenoid or valve body parts?

Yes. After replacing a solenoid, perform a computer-guided calibration. The pointed follow-up in the thread was, “After replacing the solenoid, did you calibrate the transmission with a computer?” Skipping adaptation can leave fill times and pressures misaligned, causing harsh engagements. Always recalibrate before further conclusions. [Elektroda, romuald-f, post #17254476]

Should I replace solenoids to cure an R-only jerk?

No. Blind solenoid replacement is not proper automatic transmission repair. As an expert warned, “If you think that ASB repair involves replacing solenoid valves… [you’re] not an ASB mechanic.” Start with scanner calibration and structured diagnostics before touching hardware. This avoids needless cost and risk. [Elektroda, romuald-f, post #17256524]

Can Lexia/Diagbox perform the AM6 calibration?

Use a scanner capable of AM6 adaptation; the guidance was to calibrate “with the scanner.” If your tool supports the AM6 functions, run its gearbox adaptation program. Follow the on‑screen sequence precisely and verify after. If unavailable, use another compatible diagnostic platform. [Elektroda, romuald-f, post #17255934]

Is a brake band the likely cause of an R jerk here?

The discussed advice did not point to a brake band. The recommended first step was to perform a scanner calibration. Complete adaptation before suspecting mechanical hardware. This approach reduces unnecessary teardown and targets control issues first. [Elektroda, romuald-f, post #17255934]

Does the issue happen when cold on this 258,000 km C5?

No, in the reported case it did not. The driver noted that, before driving and warming up, selecting D or R at a standstill produced no disturbing symptoms. The harsh Reverse engagement appeared only after a drive. Mileage was stated as 258,000 km. [Elektroda, Lysyxmv6, post #17253813]

Does the symptom clear after a cooldown period?

Yes, in this case it did. After about 10 minutes, the driver selected Reverse again and there was no impact. This edge case shows an intermittent condition that can mask itself after short cool-downs. Verify with multiple checks after calibration. [Elektroda, Lysyxmv6, post #17253813]

What does "calibration" mean in this context?

Calibration is a scanner-guided adaptation that re-establishes control parameters for the AM6. You run it with a diagnostic computer, following the tool’s instructions start to finish. It is the advised first action before parts replacement or teardown. “First, do a calibration with the scanner.” [Elektroda, romuald-f, post #17255934]

Is Drive (D) engagement affected too?

In the reported case, no. The driver wrote that the car changed gears smoothly, and the strong blow appeared only on selecting Reverse after driving. Drive engagement at a standstill showed no disturbing symptoms when cold. This helps isolate the complaint to Reverse selection. [Elektroda, Lysyxmv6, post #17253813]

Should I start with software adaptation before any mechanical teardown?

Yes. The guidance prioritized software adaptation. As stated: “First, do a calibration with the scanner.” This establishes whether control parameters caused the harsh Reverse engagement. Only after a correct adaptation should you consider hardware investigation. It saves time and avoids unnecessary costs. [Elektroda, romuald-f, post #17255934]
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