VOLVO-MACK-MID128-PID110-FMI0 critical Volvo/Mack D/MP Series ›

Engine Coolant Temperature Data Valid But Above Normal (Most Severe)

The VOLVO-MACK-MID128-PID110-FMI0 (Volvo/Mack D/MP Series) diesel fault code means: Engine Coolant Temperature Data Valid But Above Normal (Most Severe). This is a critical severity code.

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Keep driving?
No — stop driving
DIY difficulty
intermediate
Estimated cost
$300-$1,800
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What Are the Symptoms of VOLVO-MACK-MID128-PID110-FMI0?

  • Temperature gauge at or above red line
  • Engine forced shutdown or severe derate
  • Coolant boiling from overflow tank
  • Steam from engine bay
  • Hot coolant smell in cab

What Causes VOLVO-MACK-MID128-PID110-FMI0? (Most Likely First)

  • Actual engine overheat — low coolant, failed fan, stuck thermostat Very Likely
  • Plugged or dirty radiator/CAC restricting heat transfer Likely
  • Viscous fan clutch or electric fan failure Likely
  • Water pump failure or belt slippage Possible
  • Failed ECT sensor reporting falsely high Less Likely

Can I Still Drive with VOLVO-MACK-MID128-PID110-FMI0?

No — stop driving. VOLVO-MACK-MID128-PID110-FMI0 is rated critical severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.

Frequently Asked Questions

What does Volvo/Mack code MID128-PID110-FMI0 mean?

Volvo/Mack code MID128-PID110-FMI0 (Engine Coolant Temperature Data Valid But Above Normal (Most Severe)) is a critical-severity diagnostic trouble code set on D11/MP7, D13/MP8, and D16/MP10 diesel engines in Volvo VNL/VNR and Mack Anthem/Pinnacle/Granite/Titan trucks. It indicates a fault in the cooling system and should be read with Volvo Premium Tech Tool (PTT) or Mack Guided Diagnostics.

Can I drive a Volvo or Mack truck with code MID128-PID110-FMI0?

No — this fault typically triggers derate or forced engine shutdown countdown. Further operation risks engine damage or stranding. Repair before continuing service.

How much does it cost to fix Volvo/Mack code MID128-PID110-FMI0?

Typical repair falls in the range $300-$1,800. Sensor/wiring repairs are at the low end; EGR cooler, NOx sensor set, DEF pump, injector, or head work runs at the high end. Volvo PTT or Mack Guided Diagnostics is normally required for calibration and parameter programming.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose VOLVO-MACK-MID128-PID110-FMI0?

  1. SHUT DOWN engine immediately when this fault is active; continuing to run risks head, piston, or bearing damage.

  2. Verify coolant level after cooldown (never open a hot cap); top up with correct Volvo/Mack-spec ELC.

  3. Inspect belt drive, viscous fan engagement on hot run, and radiator/CAC fins for debris blockage.

  4. Connect Volvo PTT or Mack Guided Diagnostics and command fan ON to verify clutch engages.

  5. Test thermostat opening temp in hot-water bath; replace if stuck closed.

  6. Pressure-test cooling system for leaks; combustion-gas test coolant for head gasket leak.

Which Vehicles Commonly Get VOLVO-MACK-MID128-PID110-FMI0?

  • Volvo VNL 760/860 with D13
  • Volvo VNR 640 with D11/D13
  • Mack Anthem with MP8
  • Mack Pinnacle with MP7/MP8
  • Mack Granite with MP7/MP8
  • Mack Titan with MP10

Explore More

More Volvo/Mack D/MP Series codes → Diesel home All diesel codes Heavy-duty Guides

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