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Volvo FH 2006 - Automatic error MID 223 PSID 9 FMI 12 does not work

TomasAGC 38982 12
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  • #1 16814135
    TomasAGC
    Level 16  
    Hello
    The problem with Volvo FH is that only the gears selected manually after switching to A no gear work the accelerator pedal works in the gearbox and brakes no errors. Only what is active is MID 223 PSID 9 FMI 12
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  • #2 16814163
    Foxtrott
    Level 34  
    Volvo FH 2006 - Automatic error MID 223 PSID 9 FMI 12 does not work MID 223 PSID 9 FMI 12
    Incorrect wiring (break or short circuit)
    No sensor signal
    Two or more sensors are active at the same time.
    Generally, electrical installation needs to be checked, especially on "breaking".
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  • #3 16814232
    TomasAGC
    Level 16  
    And the jack joystick itself may be damaged? Because everything works manually.
  • #4 16814363
    darfur5
    Level 35  
    It is thanks to this error that you only have the manual. If you had everything working, you would have both.
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  • #5 16816406
    TomasAGC
    Level 16  
    Foxtrott wrote:
    Volvo FH 2006 - Automatic error MID 223 PSID 9 FMI 12 does not work MID 223 PSID 9 FMI 12
    Incorrect wiring (break or short circuit)
    No sensor signal
    Two or more sensors are active at the same time.
    Generally, electrical installation needs to be checked, especially on "breaking".



    Where is this breaking?
  • #6 16817219
    Foxtrott
    Level 34  
    You lift the cabin = you break the cabin - the place where the beam passes from the cabin to the frame.
  • #7 17245005
    pabloo88
    Level 10  
    Hello, I have the same problem, only that the driver came down to the square on the manual. And now everything works. And I don't know what to look for and think about it
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  • #8 17245593
    Anonymous
    Level 1  
  • #9 17798685
    Piterr2212
    Level 9  
    I warmly welcome.
    Please check the joystick wiring, the error describes an open circuit or a faulty component.
    Do not look in the frame (On breaking) another error if the break in the frame.
    There is clearly a selector error, not a gearbox.
    Please check the transition on the plug at the bottom of the driver's seat. [Img-0] Volvo FH 2006 - Automatic error MID 223 PSID 9 FMI 12 does not work Volvo FH 2006 - Automatic error MID 223 PSID 9 FMI 12 does not work
    I personally solder the wires.
  • #10 17820786
    esterr
    Level 1  
    Hello,
    I have the same problem as in the subject. MID 223 PSID 9 FMI 12 at VOLVO FH 2011 / 460km - manifested by the lack of the AUTO mode on the selector. It is MANUAL and only forward.
    Please advise what else to look for.
    So far I have checked both plugs for the selector (under the selector and under the seat) - they were generally clean but I secured them with WD40.
    In addition, I tried to swap the K5 relays (maybe it got hung up). Unfortunately, nothing helped?
    Engine and transmission system - NO FAULTS.
    Apparently, under the panel with fuses are some controllers that route the signal - can it be ???
    Thank you in advance for your answer.
  • #11 18201880
    Adipoznan1
    Level 1  
    Hello, did someone manage to solve the problem in a different way than the plug next to the violet?
    I have everything with the plug and the error is still ...
  • #12 20490077
    ganizaniselemani0
    Level 4  
    Thanks to you piter2212..it worked..salute..you're a life saver
  • #13 21770887
    konradwantusiak
    Level 2  
    In my case, the cable under the seat was broken, and I fixed a few more in the process.
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Topic summary

✨ The discussion revolves around a malfunction in the Volvo FH 2006 model, specifically related to the automatic transmission system, indicated by the error code MID 223 PSID 9 FMI 12. Users report that the vehicle only operates in manual mode, with the accelerator functioning but no automatic gear selection. Potential causes include incorrect wiring, faulty sensors, or issues with the joystick selector. Recommendations include checking the wiring for breaks or short circuits, inspecting the joystick for damage, and ensuring that no two sensors are activated simultaneously. Some users have also suggested examining the connections under the driver's seat and the selector plug for faults.

FAQ

TL;DR: For Volvo FH (e.g., 2006–2011), MID 223 PSID 9 FMI 12 points to 3 likely causes and disables AUTO; “Generally, electrical installation needs to be checked, especially on ‘breaking’.” [Elektroda, Foxtrott, post #16814163]

Why it matters: This FAQ helps Volvo FH owners and techs quickly restore AUTO shifting by targeting the real fault, not the gearbox.

Quick Facts

What does MID 223 PSID 9 FMI 12 mean on a Volvo FH?

It flags a gear selector circuit fault. Typical causes are an open or short, missing sensor signal, or two selector sensors reading simultaneously. AUTO mode is inhibited until the circuit fault is cleared. “Generally, electrical installation needs to be checked, especially on ‘breaking’.” [Elektroda, Foxtrott, post #16814163]

Why does my FH only shift manually when this code appears?

The transmission controller disables AUTO if it detects a selector fault. Owners report manual still works, while AUTO vanishes, sometimes with forward-only movement logged by one case. This behavior comes directly from the selector error, not the gearbox. [Elektroda, darfur5, post #16814363]

Where does the wiring usually break?

A frequent failure point is the harness that flexes when you tilt the cab, at the cab-to-frame pass-through. Inspect the loom and strain-relief there for cracked insulation or pulled pins. Check continuity through the bend while moving the cab. [Elektroda, Foxtrott, post #16817219]

Which connectors should I check first?

Check two places: the plug directly under the selector and the multi-pin connector under the driver’s seat. Clean, reseat, and inspect for backed-out pins or stretched conductors at both locations. [Elektroda, esterr, post #17820786]

How do I fix the under-seat plug issue? (3 quick steps)

  1. Unplug the under-seat connector and inspect each pin and wire for breaks.
  2. Repair breaks; many owners solder and heat-shrink the conductors.
  3. Reseat the plug firmly and clear codes; test AUTO. [Elektroda, Piterr2212, post #17798685]

Could the joystick/selector itself be faulty?

Yes. The fault points to the selector side. A defective selector or its internal sensors can cause an open-circuit or dual-sensor state. Verify wiring first, then substitute a known-good selector if needed. “There is clearly a selector error, not a gearbox.” [Elektroda, Piterr2212, post #17798685]

Does swapping the K5 relay help with this code?

One owner tried swapping K5 relays with no change. That suggests the issue is not relay-related but in the selector wiring or sensors. Focus on connectors and harness integrity before relay diagnostics. [Elektroda, esterr, post #17820786]

How can I check if two selector sensors are active at once?

Monitor the selector’s signal lines while moving through positions. The controller flags a fault if two position sensors read active together. Inspect wiring for shorts between signal lines that could tie channels. [Elektroda, Anonymous, post #17245593]

Is the gearbox or engine at fault here?

Evidence from owners shows no engine or transmission faults when this code appears. The problem resides in the selector circuit, not internal gearbox mechanics. Fixing wiring restored normal operation. [Elektroda, esterr, post #17820786]

WD-40 made no difference—what next?

Cleaning alone may not solve fractured conductors. After cleaning, perform a tug test and continuity test on each selector wire. Repair any broken or high-resistance paths to restore AUTO. [Elektroda, esterr, post #17820786]

What do experienced techs recommend checking first?

Follow the selector circuit. Inspect for incorrect wiring, missing sensor signal, or simultaneous sensor activity. “Generally, electrical installation needs to be checked, especially on ‘breaking’.” Prioritize flexible sections and connectors. [Elektroda, Foxtrott, post #16814163]

Has anyone confirmed an under-seat cable break as the fix?

Yes. A recent owner reported a broken cable under the seat and fixed several more during repair. Restoring conductor integrity resolved the issue. [Elektroda, konradwantusiak, post #21770887]

My truck had the code, then everything worked again—should I still inspect it?

Yes. An intermittent manual-only episode was reported by another owner. That behavior indicates a marginal connection that could recur under vibration or cab tilting. Inspect and secure the wiring now. [Elektroda, pabloo88, post #17245005]

Do accelerator and brakes show faults with this error?

Owners noted accelerator response and brakes remained normal while the transmission stayed in manual. That supports a localized selector circuit issue rather than a broader system failure. [Elektroda, TomasAGC, post #16814135]

What basic tools help with this repair?

Use contact cleaner, small picks for terminals, heat-shrink, and a soldering iron if you choose permanent wire repair. Many owners report success after soldering damaged conductors. [Elektroda, Piterr2212, post #17798685]
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