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.
- Keep driving?
- No -- stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $300-$1,800
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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
Connect Volvo PTT or Mack Guided Diagnostics and capture freeze-frame for the fault.
Verify live data against expected spec for the sensor/system in question.
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.