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[Solved] Volvo FH 13 JShift: MID 130 PSID26 FMI 7 Failure, Air Braking Issues & Valve Replacement

DAMIAN124420 16674 12
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  • #1 16927529
    DAMIAN124420
    Level 2  
    Posts: 4
    Rate: 1
    Board Language: polish
    WELCOME FOR ANY TIME, I HAVE A PROBLEM WITH VOLVO V AUTOMATIC DISPLAYS MID 130 PSID26 FMI 7 FAILURE WHEN I FIGHT VOLVO AFTER BREAKING THE AIR I WILL DRINK THE AIR WHEN I WANT TO TURNLESS I HAVE WRITTEN TO WRITTEN EVERYTHING COMES BACK TO THE STANDARD. THIS OPTION WILL APPEAR ONLY WHEN THE TRANSMISSION IS COLD, THE KIDNEY VALVE HAS BEEN REPLACED ON THE RIGHT SIDE AND THE MODES WILL BE MADE ALSO.
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  • #2 16927587
    arturdip
    Level 31  
    Posts: 1170
    Help: 170
    Rate: 322
    Board Language: polish
    Hello, it's hard to understand. Except arthur
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  • #3 16928361
    Cobrat
    Level 22  
    Posts: 428
    Help: 35
    Rate: 499
    Board Language: polish
    First of all, correct your spelling and turn off Caps, because you actually don't read well.

    I understand that the gearbox selector is regenerated? After replacing the clutch and the rest of the procedures, the calibration passed? Done at all?

    Here are some hints (ENG), translate yourself:


    MID130 Transmission Control Unit, Fault Codes MID 130 PSID 26 Gears 2/3 Engagement System
    Attachments:
    • Volvo FH 13 JShift: MID 130 PSID26 FMI 7 Failure, Air Braking Issues & Valve Replacement FMI 7.JPG (24.67 KB) You must be logged in to download this attachment.
  • #4 16929489
    DAMIAN124420
    Level 2  
    Posts: 4
    Rate: 1
    Board Language: polish
    yes, everything done, calibration, also piston rod, complete set of sealants, all the new original clutch happens only after a pause and a long stop when the car is cold, as if the crate is calming, you can hear the air on the crate escaping and then the error pops out, I extinguish and it's ok but I didn't think that maybe under the coils of the selector which drum is jamming because it has no option and after re-ignition the error disappears
  • #5 17029508
    TomasAGC
    Level 16  
    Posts: 270
    Help: 13
    Rate: 210
    Board Language: polish
    Did you solve the problem of this air?
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  • #6 17029909
    stanisławpiotr
    Level 33  
    Posts: 1539
    Help: 209
    Rate: 819
    Board Language: polish
    If you can hear the air from the box vent, the pistons under the electronics for repair.
  • #7 17030367
    DAMIAN124420
    Level 2  
    Posts: 4
    Rate: 1
    Board Language: polish
    are these the pistons under the coils four on one side and bake on the other?

    Added after 3 [minutes]:

    the car travels after a pause lights up the bijo the air gives on and goes as long as the 5th to 6th gear stutters it off then we turn on the error disappears and the car goes without extinguishing will not go as it heats up everything works
  • #8 17597380
    Grzesiek721
    Level 1  
    Posts: 1
    Rate: 3
    Board Language: polish
    Hello. Did you solve this problem? I have a similar one and would like to know what the problem is. Thanks in advance and regards
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  • #9 18272064
    Sebastian_92
    Level 2  
    Posts: 3
    Rate: 3
    Board Language: polish
    someone managed to decipher the cause?
  • #10 18386673
    trucktech
    Level 7  
    Posts: 7
    Rate: 17
    Board Language: polish
    Auto whistle chauffeur ...
    surely the seals are not under the electronics.
  • #11 18740961
    Jablonowski28
    Level 2  
    Posts: 2
    Rate: 1
    Board Language: polish
    Hello . I have the same problem or someone found the reason ????
  • #12 19618864
    AdamRogulski
    Level 6  
    Posts: 3
    Board Language: polish
    I have the same problem with 5 to 6 cutting off the gas pedal. After being put out and lit, it returns to normal again. I replaced the rectangular gaskets, then all in the selector, I changed the gas pedal, I changed the EBS cassette, the tape in the selector and the ass inserted from PLN 8,000 and I still don't know anything. After replacing the belt, ie on 09/18/21, the gears did not jam, but at the approach to the intersection he remained at 10 and tugs. After extinguishing it several times, everything came back. I have no patience with this grandfather anymore.
  • #13 19666627
    DAMIAN124420
    Level 2  
    Posts: 4
    Rate: 1
    Board Language: polish
    It was possible to repair it quite by accident, the piston rod was cracked on the roller and it broke, but the whole cartridge was cleaned and new o-rings were replaced.
    The crack was in such a place that it was not visible until it cracked, it became clear. The costs are about PLN 700, the car now drives for 3 years and nothing
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Topic summary

✨ The discussion revolves around a Volvo FH 13 experiencing a MID 130 PSID 26 FMI 7 failure related to air braking issues. The user reports that the error occurs when the transmission is cold, and after a pause, the vehicle exhibits air escaping from the gearbox, leading to operational issues, particularly during gear shifts from 5th to 6th. Various responses suggest potential causes, including problems with the gearbox selector, pistons under the electronics, and the need for calibration after replacing components like the clutch and seals. One user successfully resolved a similar issue by replacing a cracked piston rod and cleaning the cartridge, which led to a long-term fix.
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FAQ

TL;DR: Common culprit for Volvo FH13 JShift MID 130 PSID26 FMI7 is a cracked selector piston rod; fix held 3 years, ~PLN 700. “The crack was not visible until it cracked.” [Elektroda, DAMIAN124420, post #19666627]

Why it matters: This FAQ helps FH/J‑Shift owners diagnose cold-start air/braking symptoms and clear the persistent MID130 PSID26 FMI7 fault fast.

Quick Facts

What does MID 130 PSID 26 FMI 7 mean on a Volvo FH13 JShift?

It identifies a Transmission Control Unit fault in the gears 2/3 engagement system. The code narrows diagnosis to the selector and related pneumatics. Start with the selector pack and its pistons, seals, and control coils. Check for air leaks and cold-shift behavior. [Elektroda, Cobrat, post #16928361]

Why does the fault show up only when the transmission is cold?

Cold seals and a marginal crack can leak more air until temperatures rise. The OP reported hissing air from the gearbox and a fault that vanished after restarting once warm. This pattern points to selector leakage or a cracked actuator component aggravated by low temperatures. [Elektroda, DAMIAN124420, post #16929489]

I hear air escaping near the gearbox—what should I check first?

Listen at the gearbox vent. If air leaks there, focus on the selector pistons located beneath the electronics. Rebuild or repair that piston set and inspect the actuator rod for damage. “If you can hear the air from the box vent, the pistons... for repair.” [Elektroda, stanisławpiotr, post #17029909]

The truck cuts throttle during the 5→6 shift and then drives fine after a restart. What’s happening?

That pattern matches a selector or pneumatic issue causing temporary loss of shift control. One user replaced multiple parts without resolution, and the symptom cleared only after cycling ignition. An edge case held 10th gear at a stop before a restart fixed it. [Elektroda, AdamRogulski, post #19618864]

What actually fixed the recurring MID130 PSID26 FMI7 fault in this thread?

A cracked piston rod on the selector roller was the root cause. The repair included cleaning the entire cartridge and fitting new O‑rings. After this, the truck ran fault‑free. “The crack was in such a place that it was not visible until it cracked.” [Elektroda, DAMIAN124420, post #19666627]

How much did the successful fix cost and how long did it last?

Approximate outlay was PLN 700 for parts and service around the selector cartridge. The poster reports three years of trouble‑free operation after repair. That durability strongly implicates the cracked rod and sealing as the true fault path. This provides a practical target repair. [Elektroda, DAMIAN124420, post #19666627]

How do I confirm a cracked piston rod in the selector pack?

  1. Remove the selector cartridge and clean it thoroughly.
  2. Inspect the piston rod on the roller for hairline cracks under good light.
  3. Replace the rod if cracked, and fit new O‑rings; reassemble and test. This exact sequence resolved the fault for the OP. [Elektroda, DAMIAN124420, post #19666627]

Will replacing gaskets, the accelerator pedal, or the EBS cassette fix this code?

Not necessarily. One owner replaced rectangular gaskets, all selector seals, the accelerator pedal, the EBS module, and the selector tape—spending about PLN 8,000—without a cure. The root cause remained in the selector’s mechanicals until addressed. Diagnose before shotgun parts replacement. [Elektroda, AdamRogulski, post #19618864]

The fault disappears after I cycle the ignition. Is that a known behavior?

Yes. Several reports show the error clears after switching off and on, then returns under specific shifts while cold. This suggests a marginal leak or crack that self‑seals once warm or repressurized. Plan a mechanical inspection rather than relying on resets. [Elektroda, DAMIAN124420, post #17030367]

Where are the pistons and coils everyone mentions?

They sit beneath the selector electronics on the gearbox. Coils control the pistons that route air for gear engagement. If air leaks through this section, the pistons or their seals likely need service. Prioritize this assembly when MID130 PSID26 FMI7 appears. [Elektroda, stanisławpiotr, post #17029909]

Do I need calibration after clutch or selector work?

Yes. Ensure selector regeneration and clutch procedures include calibration. One responder specifically asked whether the calibration was completed after parts work. Without correct calibration, shifts can misbehave and mask underlying mechanical issues. Confirm procedures with Volvo diagnostics. [Elektroda, Cobrat, post #16928361]

What symptoms point to a sealing problem versus electronics?

Air hissing, faults on cold start, and improvement as the drivetrain warms suggest sealing or mechanical faults. Electronics faults rarely improve with temperature or simple restarts. “Auto whistle chauffeur...” hints the noise is mechanical, not the ECU. Investigate seals and the piston rod first. [Elektroda, trucktech, post #18386673]

Could a cracked rod be invisible until it finally fails?

Yes. The OP reported the crack was hidden until it fully fractured. After the break, the cause became obvious during teardown. This explains intermittent behavior before failure and the cold‑only pattern many owners observe. Quote: “not visible until it cracked.” [Elektroda, DAMIAN124420, post #19666627]

What’s a practical first diagnostic step without special tools?

Listen for air at the gearbox vent right after a cold start. If you hear a hiss, focus on the selector pistons under the electronics and plan a cartridge service. This simple check can save time and parts costs. [Elektroda, stanisławpiotr, post #17029909]
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