Battery Supply Voltage Above Normal
What does VOLVO-MACK-MID140-PID168-FMI3 mean?
The VOLVO-MACK-MID140-PID168-FMI3 (Volvo/Mack D/MP Series) diesel fault code means: Battery Supply Voltage Above Normal. This is a serious severity code.
Common Symptoms
- Affected gauge reads incorrectly or is frozen
- Cluster warning indicator illuminated
- Datalink message lost (CAN-wide effects)
- Speedometer reads zero or erratic
- Low-voltage shutdown on heavy starts
Probable Causes (Ranked by Likelihood)
- Failed charging system or cluster module input Likely
- Wiring damage or connector corrosion Likely
- Poor ground at cluster or chassis ground block Possible
- Alternator or battery issue (charging codes) Possible
- Cluster EEPROM corruption Less Likely
Step-by-Step Diagnostic Procedure
Connect Volvo PTT or Mack Guided Diagnostics (cluster module) and verify MID140-PID168-FMI3 active; check freeze-frame.
Measure battery and alternator voltage at the cluster pin (13.8-14.4V engine running).
Inspect chassis grounds at the cluster and engine-to-frame ground strap.
For datalink codes, measure CAN-H / CAN-L termination resistance (should be ~60 ohms with key off, ignition disconnected).
Inspect harness routing behind the dash for chafe, pinch, or heat damage.
After repair, cycle key and verify code clears via PTT or Guided Diagnostics.
Frequently Asked Questions
What does Volvo/Mack code MID140-PID168-FMI3 mean?
Volvo/Mack code MID140-PID168-FMI3 (Battery Supply Voltage Above Normal) is a serious-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 charging system 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 MID140-PID168-FMI3?
Short distances may be acceptable to reach a repair facility, but the fault will escalate to derate (typically 55 mph then 5 mph on aftertreatment faults). Do not defer diagnosis beyond a shift.
How much does it cost to fix Volvo/Mack code MID140-PID168-FMI3?
Typical repair falls in the range $200-$1,200. 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.