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Volvo FH 13 500 Error: MID 128 SID 85 FMI 5 - Seeking Help & Solutions on Forum

marek124l 12738 12
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  • #1 16769471
    marek124l
    Level 9  
    Posts: 7
    Rate: 68
    Hello can anyone help me with this error?
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  • #2 16769539
    Cobrat
    Level 22  
    Posts: 428
    Help: 35
    Rate: 499
    I only have this bizarre translation:




    Possibly I found something else (RUS): Link
    Attachments:
    • sid 85.jpg (182.63 KB) You must be logged in to download this attachment.
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  • #3 16771032
    marek124l
    Level 9  
    Posts: 7
    Rate: 68
    Where to look for the cause?
  • #4 16771107
    MACIEK_M
    Level 29  
    Posts: 1179
    Help: 111
    Rate: 461
    Quote:
    Where to look for the cause?


    In the electric installation of the piston cooling valve. From what I remember it is on the filter block.
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  • #5 16775109
    stanisławpiotr
    Level 33  
    Posts: 1540
    Help: 209
    Rate: 819
    Repair info below. Possible damage to the coil winding (open circuit) of the valve or internal short circuit of the coil to ground.
    Attachments:
    • kontrola złącze edc.pdf (137.81 KB) You must be logged in to download this attachment.
    • mid 128 sid 85 fmi 5 lokalizacja zaworu.pdf (322.76 KB) You must be logged in to download this attachment.
    • kontrola zasilanie zaworu schemat.pdf (86.88 KB) You must be logged in to download this attachment.
    • kontrola złacze zaworu.pdf (50.56 KB) You must be logged in to download this attachment.
    • mid 128 sid 85 fmi 5 opis usterki.pdf (89.05 KB) You must be logged in to download this attachment.
  • #6 16781383
    marek124l
    Level 9  
    Posts: 7
    Rate: 68
    Thank you very much
  • Helpful post
    #7 16781549
    stanisławpiotr
    Level 33  
    Posts: 1540
    Help: 209
    Rate: 819
    If I helped, select a helpful topic.
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  • #8 17640089
    Jacekm123123
    Level 2  
    Posts: 3
    After replacing the solenoid, the error remained.
  • #9 17640480
    Anonymous
    Level 1  
  • #10 17640748
    stanisławpiotr
    Level 33  
    Posts: 1540
    Help: 209
    Rate: 819
    Valve failure often blows the fuse.
  • #11 17640829
    Jacekm123123
    Level 2  
    Posts: 3
    And you don't know which one it can be?
  • #12 17640864
    stanisławpiotr
    Level 33  
    Posts: 1540
    Help: 209
    Rate: 819
    You have f41 in the diagram.
  • #13 17641656
    Jacekm123123
    Level 2  
    Posts: 3
    Fuses ok ... maybe the second solenoid valve (vertical) is broken. Is it possible? Unless one of the sensors?
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Topic summary

✨ The discussion revolves around the Volvo FH 13 500 truck experiencing an error code: MID 128 SID 85 FMI 5. Users suggest that the issue may stem from the electric installation of the piston cooling valve, located on the filter block. Potential causes include damage to the coil winding of the valve or an internal short circuit. Recommendations include checking the fuse and wiring, as valve failures can often blow fuses. One user noted that after replacing the solenoid, the error persisted, prompting further investigation into the second solenoid valve or sensors.
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FAQ

TL;DR: Volvo FH13 code MID 128 SID 85 FMI 5 often traces to the piston-cooling valve circuit; 1 blown fuse can trigger it. “Valve failure often blows the fuse.” [Elektroda, stanisławpiotr, post #17640748]

Why it matters: This FAQ helps Volvo FH13 owners and techs quickly diagnose and fix this recurring engine fault without guesswork.

Quick Facts

What does Volvo fault MID 128 SID 85 FMI 5 actually mean?

It flags an electrical fault in the piston-cooling valve circuit. Typical failures are an open coil winding or a coil short to ground. That fault interrupts ECM control and logs the code. Replace or repair the affected valve or wiring to clear it. [Elektroda, stanisławpiotr, post #16775109]

Where is the piston-cooling valve on the FH13?

Technicians report this valve on or near the engine’s filter block. Inspect the harness and connector in that area for rub-through or corrosion. Look for oil contamination that can wick into the plug and raise resistance. Clean, reseat, and test continuity. [Elektroda, MACIEK_M, post #16771107]

Which fuse should I check for this fault?

Check fuse F41. A failed piston-cooling valve can blow this fuse and keep the code active. Test F41 with a meter, not just visually. Replace the fuse only after addressing the root cause to avoid repeat failure. [Elektroda, stanisławpiotr, post #17640864]

Can a bad valve really blow the fuse and cause the code?

Yes. An internally shorted coil draws excess current and blows the circuit fuse. The ECM then detects the open circuit and sets MID 128 SID 85 FMI 5. “Valve failure often blows the fuse.” Replace the faulty valve and restore power. [Elektroda, stanisławpiotr, post #17640748]

I replaced the solenoid but the error stayed—what now?

Confirm power and ground: test the fuse, harness continuity, and connector pins. A previously blown fuse or damaged wiring can leave the code latched. Clear the DTC after repairs and verify live status. Don’t assume the new part fixed supply issues. [Elektroda, Jacekm123123, post #17640089]

What’s the quick 3-step way to diagnose this code?

  1. Inspect and test fuse F41 with a meter.
  2. Check valve connector, harness, and coil resistance at the filter-block valve.
  3. Repair wiring or replace the valve, then clear the DTC and road test. [Elektroda, stanisławpiotr, post #17640864]

Does wiring matter if the solenoid tests OK?

Yes. A broken conductor or corroded pin creates an open circuit the ECM detects. Wiggle-test the harness near the filter block while monitoring continuity. Repair any damaged section and reseal connectors against oil ingress. [Elektroda, Anonymous, post #17640480]

Could a second (vertical) solenoid be the issue instead?

If F41 and wiring are good, another valve on that assembly might be faulty. However, the cited code targets the piston-cooling valve circuit. Test each coil on that block and compare readings before replacing parts. [Elektroda, stanisławpiotr, post #16775109]

What is an FMI and how does FMI 5 guide the fix?

Failure Mode Identifier (FMI) describes the fault type. FMI 5 indicates current below normal or open circuit. That points to a blown fuse, broken wire, or open coil. Prioritize power and continuity checks before component swaps. [Elektroda, stanisławpiotr, post #16775109]

What is MID 128 in Volvo diagnostics?

MID identifies the controller; MID 128 refers to the engine control module. A SID then points to a subsystem like the piston-cooling valve. Use this map to focus testing on the correct circuit first. [Elektroda, stanisławpiotr, post #16775109]

What’s a piston-cooling valve and why does it matter?

It controls oil jets that cool the pistons under load. Electrical failure disables control and may risk thermal stress. Fixing the circuit restores commanded cooling and prevents repeat DTCs. [Elektroda, MACIEK_M, post #16771107]

How common is a fuse-related cause for this code?

Forum experience indicates it’s frequent when the coil shorts. One expert noted that valve failure often blows the fuse. Treat F41 testing as a first step to avoid unnecessary parts. [Elektroda, stanisławpiotr, post #17640748]

Edge case: the fuses check out—what could still be wrong?

A partially shorted coil may pass a static fuse check yet misbehave hot. Substitute a known-good valve or measure coil resistance warm. Replace if readings drift out of spec or the code returns. [Elektroda, stanisławpiotr, post #16775109]

Will clearing the code without repairs help?

No. If power or the coil is still faulty, the ECM will re-log the DTC immediately. Fix the electrical cause first, then clear and confirm. [Elektroda, Anonymous, post #17640480]

Any tip to avoid repeat failures after repair?

Secure the harness away from sharp edges near the filter block. Clean and reseal connectors to prevent oil wicking and corrosion that lead to opens. [Elektroda, MACIEK_M, post #16771107]
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