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MID 128 PID 105 FMI 0Severity: Warning

MID 128 PID 105 FMI 0: Intake Manifold Temperature - Too High (Volvo)

Quick Answer

When MID 128 PID 105 FMI 0 sets, the ECM is indicating a fault condition involving the component or system named in the code.

OEM definitions and thresholds can vary, so confirm the exact meaning with service information or a capable diagnostic tool.

Code
MID 128 PID 105 FMI 0
Severity
Warning
Applies to
Check OEM application
Can I drive?
A short trip may be possible if the truck is operating normally and there is no stop-engine or critical warning. Diagnose MID 128 PID 105 FMI 0 soon and use the live-data and circuit checks below to determine how urgent the fault is.

Common Symptoms

  • Engine derate
  • Check engine lamp
  • Reduced power
  • Possible detonation/knock under load

Likely Causes

  • EGR system malfunction (too much hot exhaust gas)
  • Charge air cooler (CAC) restricted or blocked
  • Turbocharger overworking (overboost condition)
  • Ambient temperature extremely high

Quick Diagnostic Checks

Check first
  1. 1Scan for companion codes and record freeze-frame data (if available).
  2. 2Inspect connectors, harness rub points, and pins for corrosion.
  3. 3Check for other active faults that may be upstream causes (communications, sensors, air/fuel issues).
  4. 4After repair, clear codes and confirm the fault stays inactive after a drive cycle.

Common Fixes

  • Check EGR cooler for blockage
  • Inspect charge air cooler for external blockage
  • Verify EGR valve operation
  • Check for overboost conditions
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FitmentsMeaningHow it worksImagesDetailed guideOEM/Engine notesLocation hintScan tool checksStep-by-step diagnosticDecision guideMisdiagnosisDerate/inducementChecklistToolsPreventionCommunity discussionsCommunity videosCommunity notesShare

What does MID 128 PID 105 FMI 0 mean?

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When MID 128 PID 105 FMI 0 sets, the ECM is indicating a fault condition involving the component or system named in the code.

OEM definitions and thresholds can vary, so confirm the exact meaning with service information or a capable diagnostic tool.

Treat repeat faults as ACTIVE and diagnose using live data, wiring checks, and basic inspections before replacing parts.

How this system works (why MID 128 PID 105 FMI 0 happens)

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Most modern fault logic is based on expected versus actual sensor readings, timing windows, circuit checks, and plausibility tests.

A stored code can come from a temporary event, while a repeatable active code gives you a much better diagnostic target.

The goal is to identify whether the failure is electrical, mechanical, sensor-related, or caused by another upstream fault before replacing components.

Detailed guide for MID 128 PID 105 FMI 0

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MID 128 PID 105 FMI 0 - Intake Manifold Temperature Too High

**Why This Matters**: High intake air temperature reduces air density, which means less oxygen for combustion. The ECM responds by reducing fuel (derate) to protect the engine from detonation and excessive exhaust temperatures.

🔥 What Causes High Intake Temps

**#1 - EGR System Issues**

The EGR system recirculates hot exhaust gas into the intake. If the EGR cooler is clogged or inefficient, or if the EGR valve is stuck open, too much hot gas enters the intake [citation:4].

**#2 - Charge Air Cooler Problems**

The intercooler (CAC) should drop charge air temperature significantly after the turbo. If the CAC is externally blocked (bugs, mud, debris) or internally restricted, cooling efficiency drops.

**#3 - Overboost Condition**

Higher boost pressure generates more heat. If the turbo is overboosting (see PID 102 FMI 0), intake temps will rise accordingly.

🛠️ Diagnostic Approach

**Check for Simple Stuff First:**

  • Look for debris blocking the charge air cooler fins
  • Check for bent/crushed charge air pipes
  • Verify fan operation (if electric, ensure it's running)

**Monitor with Scan Tool:**

  • Compare intake manifold temperature to ambient temperature
  • At cruise, IAT should be within 20-40°F of ambient + heat from compression
  • Under heavy load, temps rise but should stabilize

**EGR-Specific Checks:**

  • Monitor EGR valve position
  • Check EGR cooler for leaks (coolant in exhaust)
  • Inspect EGR differential pressure sensor (PID 411)

📸 Image Ideas

  • "Charge air cooler blocked with debris" (search "radiator blockage")
  • "EGR cooler soot buildup" (common diesel repair images)

💡 Prevention Tips

After 500,000 miles, consider:

  • Removing and cleaning the EGR cooler [citation:4]
  • Cleaning the charge air cooler fins
  • Checking turbocharger performance

*"EGR coolers on D13s clog up over time. If you're getting high intake temp codes, it's often the cooler partially blocked, not the sensor."* — Volvo technician

Location hint for MID 128 PID 105 FMI 0

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Component location varies by OEM and chassis. Use your engine’s service manual to confirm the sensor/valve location before replacing parts.

Tip: Inspect connectors and harness routing before replacing parts.

Scan tool checks for MID 128 PID 105 FMI 0

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  • Check status: ACTIVE vs INACTIVE / stored and review freeze-frame data when available.
  • Record companion codes and diagnose the earliest or most upstream fault first.
  • Compare live sensor values with expected operating conditions and inspect wiring and connectors.
  • Clear and re-test under similar conditions only after completing the initial inspection.

If your tool can’t run actuator tests, you can still diagnose a lot with careful inspection + repeatability testing.

Step-by-step diagnostic for MID 128 PID 105 FMI 0

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  1. Visual inspection (fast wins). Harness routing, connector pins, hoses/lines (if applicable), and obvious damage.
  2. Check fluid sanity. Not applicable unless your fault is fluid-related. Focus on inspections + repeatability.
  3. Confirm the fault is ACTIVE. Stored-only faults can be old events.
  4. Review live data and circuit values. Use OEM diagnostic software (examples: Cummins INSITE, Detroit DDDL, PACCAR DAVIE4) or a capable heavy-duty scan tool to review the affected signal, commanded/actual values when applicable, and related sensor data.
  5. Verify after repair. Clear codes, road test, confirm it stays inactive.

Decision guide (fast path) for MID 128 PID 105 FMI 0

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  • If the fault is STORED only → inspect, clear, and monitor. If it returns, treat it as active.
  • If ACTIVE → inspect the named component, connector, harness, supply/ground, and live-data plausibility.
  • If multiple codes are present → diagnose the earliest or most upstream code first.

Common misdiagnosis mistakes for MID 128 PID 105 FMI 0

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  • Replacing sensors or components without checking wiring, grounds, connector fitment, and companion codes.
  • Clearing the fault repeatedly without confirming whether it is ACTIVE and repeatable.
  • Missing an upstream fault that is causing the displayed code as a secondary symptom.

Will MID 128 PID 105 FMI 0 cause derate or inducement?

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A warning fault may allow continued operation, but the effect depends on the failed component and any companion faults.

Exact behavior depends on ECM calibration and which companion faults are active.

“Do this first” checklist for MID 128 PID 105 FMI 0

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  • Scan for companion codes and record freeze-frame data (if available).
  • Inspect connectors, harness rub points, and pins for corrosion.
  • Check for other active faults that may be upstream causes (communications, sensors, air/fuel issues).
  • After repair, clear codes and confirm the fault stays inactive after a drive cycle.

Tools needed to diagnose MID 128 PID 105 FMI 0

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  • Basic hand tools + good lighting for inspection
  • Multimeter for connector/power/ground checks (if wiring suspected)
  • OEM diagnostic software (examples: Cummins INSITE, Detroit DDDL, PACCAR DAVIE4) (or equivalent scan tool) for live data and supported diagnostic tests

Prevention tips to avoid repeat MID 128 PID 105 FMI 0

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  • Fix small wiring/connector issues early before they become repeat faults.
  • During service, inspect harness routing and clamp points near heat/vibration.
  • Don’t ignore intermittent faults. “Erratic” usually gets worse.

What to check first for MID 128 PID 105 FMI 0

  1. Inspect connectors and harness near the affected component for corrosion, rubbing, or loose pins.
  2. Check for upstream causes (communications, sensors, air/fuel issues).
  3. Check for other active faults that may be upstream causes (communications, sensors, air/fuel issues).

If the fault repeats after clearing, diagnose it as ACTIVE and review companion codes and live data before replacing parts.

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