Diesel Trouble Codes

P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low (6.7 Power Stroke)

P0107 means the PCM sees the MAP/BARO sensor signal below the valid range on a 6.7 Powerstroke. The code is defined under SAE J2012 and affects intake…

Updated September 1, 2026

What it means

The PCM is detecting a MAP/BARO sensor voltage/signal that is lower than the expected valid range. Generic definition: MAP/BARO sensor signal is below the valid range.1

Most likely causes

  1. MAP sensor internal failure or drift — The MAP/BARO sensor itself can read low/out of range, producing a low circuit signal to the PCM.1
  2. MAP sensor connector corrosion, pin damage, or loose connection — Poor terminal contact or moisture in the MAP connector can pull the signal low.1
  3. MAP sensor wiring short-to-ground or high resistance in the signal/return circuit — Chafed or damaged wiring between the sensor and PCM can bias the signal low.1
  4. Reference voltage or ground supply issue to the MAP sensor — Low 5 V reference or a compromised sensor ground can make the MAP signal read low.1
  5. PCM software anomaly affecting MAP/BARO interpretation — PCM reprogramming campaigns exist for this platform and can influence sensor-circuit diagnostics.2

How to diagnose

  1. Confirm the code and freeze-frame conditions; note engine speed, load, and ambient conditions at set.
  2. Visually inspect the MAP/BARO sensor, connector, and wiring for damage, corrosion, oil contamination, or chafing; check routing near hot/turbo components.
  3. Check MAP sensor reference voltage and ground at the connector with key-on/engine-off; compare to spec and to other 5 V sensors.
  4. Measure MAP signal voltage at idle and with key-on/engine-off; compare to barometric pressure expectations and to a known-good reference.
  5. Inspect intake tract for leaks or restrictions that could affect manifold pressure readings, as the code affects intake and boost control.
  6. Review PCM data for related codes or symptoms involving boost control, intake air temperature, or mass air flow circuits.
  7. If electrical tests are normal, consider PCM software status and applicable service information for reprogramming.
  8. Document results and clear codes, then perform a controlled road test to verify the fault does not return.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by region and vehicle condition. Electrical diagnosis typically requires minimal parts if the issue is wiring/connector related; a MAP sensor replacement is a common repair when the sensor is faulty.

When to see a pro

If wiring faults are suspected in high-pressure or safety-critical circuits, or if PCM reprogramming is required, have the vehicle evaluated by a qualified diesel technician. Do not attempt repairs to high-pressure fuel or brake systems without proper training and equipment.

Sources

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

  2. NHTSA owner report 11453497 ↩︎

Watch a repair

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

6.7L POWERSTROKE p2074 MANIFOLD ABSOLUTE PRESSURE code FIX | CHECK IT FIRST & SAVE — PistonShack