VOLVO-MACK-MID128-PID100-FMI1 critical Volvo/Mack D/MP Series ›

Engine Oil Pressure Data Valid But Below Normal

The VOLVO-MACK-MID128-PID100-FMI1 (Volvo/Mack D/MP Series) diesel fault code means: Engine Oil Pressure Data Valid But Below Normal. This is a critical severity code.

My Garage →
Keep driving?
No -- stop driving
DIY difficulty
intermediate
Estimated cost
$300-$1,800
Mobile mechanic network · I-5 corridor pilot

Down with a Volvo fault on the road?

Get connected with a verified mobile diesel mechanic near you. Verified diesel & reefer techs, launching on the freight corridor.

Find a mobile mechanic →
Built for Diesel — Not a Car Reader
ANCEL HD7000 Heavy-Duty Diesel Scanner

A $30 car code reader can't do diesel. The HD7000 reads full-system codes and does parked DPF regen, idle/speed-limit, and service resets from the cab — on everything from a 6.7 Cummins/Power Stroke/Duramax pickup to Class-8 trucks (Detroit, Paccar, CAT, Volvo, Mack, International).

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Lower-Cost Diesel Option
FOXWELL HD301 Diesel Truck Scanner
FOXWELL HD301 Diesel Truck Scanner

Full-system 6/9/16-pin diesel scan tool for Cummins, Paccar, CAT, Detroit and more — plug-and-play, no subscription. A cheaper way to read heavy-duty codes a basic OBD2 scanner skips entirely.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Common Symptoms

  • Check Engine Light illuminated
  • Possible engine derate
  • Fault code active on scan tool

Probable Causes (Ranked by Likelihood)

  • Failed sensor element Likely
  • Harness damage or connector issue Likely
  • Actual out-of-spec engine condition Possible
  • ECM calibration or software fault Less Likely

Step-by-Step Diagnostic Procedure

  1. Connect Volvo PTT or Mack Guided Diagnostics and capture freeze-frame for the fault.

  2. Verify live data against expected spec for the sensor/system in question.

  3. Inspect harness and connector for damage or corrosion.

Frequently Asked Questions

What does Volvo/Mack code MID128-PID100-FMI1 mean?

Volvo/Mack code MID128-PID100-FMI1 (Engine Oil Pressure Data Valid But Below Normal) 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 engine mechanical 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-PID100-FMI1?

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-PID100-FMI1?

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.

Explore More

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

Was this helpful?

Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.