VOLVO-MACK-MID216-PID161-FMI2 serious Volvo/Mack D/MP Series ›

Transmission Input Shaft Speed Erratic

The VOLVO-MACK-MID216-PID161-FMI2 (Volvo/Mack D/MP Series) diesel fault code means: Transmission Input Shaft Speed Erratic. This is a serious severity code.

Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.

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Keep driving?
Short distances only
DIY difficulty
advanced
Estimated cost
$400-$3,500
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What Are the Symptoms of VOLVO-MACK-MID216-PID161-FMI2?

  • Transmission warning lamp illuminated
  • Harsh or missed shifts (I-Shift/mDRIVE)
  • Neutral lockout or limp-home mode
  • Engine will not start (neutral safety fault)
  • Check Engine Light with trans fault code

What Causes VOLVO-MACK-MID216-PID161-FMI2? (Most Likely First)

  • Failed input shaft speed sensor Likely
  • Wiring harness damage at transmission connector Likely
  • Low transmission oil level or wrong fluid type Possible
  • Clutch wear (for clutch actuator codes) out of adjustment range Possible
  • TCM internal fault Less Likely

Can I Still Drive with VOLVO-MACK-MID216-PID161-FMI2?

Short distances only. VOLVO-MACK-MID216-PID161-FMI2 is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What does Volvo/Mack code MID216-PID161-FMI2 mean?

Volvo/Mack code MID216-PID161-FMI2 (Transmission Input Shaft Speed Erratic) 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 input shaft speed sensor 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 MID216-PID161-FMI2?

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 MID216-PID161-FMI2?

Typical repair falls in the range $400-$3,500. 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-MID216-PID161-FMI2?

  1. Connect Volvo PTT or Mack Guided Diagnostics (transmission module) and verify MID216-PID161-FMI2 active; read live shaft speeds, clutch position, temp.

  2. Inspect transmission harness for chafe or damage at the case connector and mid-frame crossover.

  3. Check transmission oil level at operating temperature; top up with correct Volvo/Mack spec fluid.

  4. Run clutch calibration / shift actuator learning via PTT or Guided Diagnostics.

  5. Measure sensor resistance at the sensor or TCM connector per service manual spec.

  6. If fault persists after wiring and sensor checks, TCM replacement with programming may be required.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J1939-73Application Layer: Diagnostics (defines the SPN/FMI fault-identifier framework)

Which Vehicles Commonly Get VOLVO-MACK-MID216-PID161-FMI2?

  • 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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