Diesel Trouble Codes

P0100 — Mass or Volume Air Flow Circuit Malfunction (6.7 Power Stroke)

A concise, source-backed diagnostic reference for P0100 on the 6.7 Powerstroke. Focuses on intake and sensor circuit faults, how to confirm them, and what to…

Updated September 1, 2026

What it means

The PCM is seeing a missing or out-of-range MAF sensor signal. Generic definition: MAF sensor signal is missing or out of range.1

Most likely causes

  1. Contaminated MAF sensing element — Oil, dirt, or debris on the hot-wire/film changes the measured airflow, leading to an out-of-range signal.1
  2. MAF connector corrosion or poor terminal contact — Moisture or heat cycling can degrade the MAF connector, causing intermittent or lost signal.1
  3. MAF wiring damage or chafing — Wiring faults in the MAF circuit can produce missing or implausible voltage to the PCM.1
  4. Intake air leak or restriction between air filter and MAF — Unmetered air or a restriction upstream of the MAF can cause the PCM to flag the MAF circuit as implausible. Typical on this platform: loose intake tube clamp, damaged air-filter housing, or a very dirty filter.2
  5. Related intake/temperature circuit issues — On this platform, PCM reprogramming campaigns have noted co-occurring intake air temperature circuit high input with mass or volume air flow circuit low input.3

How to diagnose

  1. Verify freeze-frame conditions and confirm P0100 is current, not historical.
  2. Inspect intake tract from air filter to turbo inlet for loose clamps, cracked tubes, damaged housing, or a very dirty filter; these are typical causes of air-flow restriction or unmetered air on this platform.
  3. Visually inspect MAF sensor and connector for contamination, corrosion, oil residue, or damaged terminals; contamination and connector corrosion are typical on this platform.
  4. Check MAF wiring harness for chafing, heat damage, or poor routing near hot/exhaust components.
  5. Review related codes; intake air temperature circuit high input can accompany mass or volume air flow circuit low input per field reports.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by region and shop. MAF sensor replacement, wiring repair, or intake service costs depend on findings. No fixed estimate provided.

When to see a pro

If the MAF circuit requires harness repair, PCM reprogramming, or intake disassembly beyond visual inspection, have a qualified diesel technician perform diagnosis and repair. Stop if you encounter high-pressure fuel lines or other safety-critical systems.

Sources

  1. Curated DTC seed — 6.7 Powerstroke (curated) ↩︎ ↩︎ ↩︎ ↩︎

  2. Curated DTC seed — 6.7 Powerstroke (curated) ↩︎

  3. NHTSA owner report 11453497 ↩︎

Watch a repair

Third-party videos, not ours — for illustration. Confirm anything against the factory service information for your truck.

Causes and Fixes P0100 Code: Mass Airflow (MAF) Circuit Problem — HVAC Mechanic