Diesel Trouble Codes

P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low (5.9 Cummins 24-Valve (VP44))

Diagnostic reference for 5.9L Cummins 24-Valve (VP44) 1998.5–2002.

Updated September 2, 2026

What it means

The ECM sees the MAP/BARO sensor signal below the valid range. On this platform the MAP sensor provides intake manifold pressure information used for fueling and boost control. A low circuit reading means the ECM is seeing an abnormally low voltage from the MAP/BARO circuit.1

Most likely causes

  1. MAP sensor internal failure or damaged sensor element — Sensor output stuck low or shorted internally, giving a low voltage to the ECM.1
  2. Wiring/connector fault to MAP sensor — chafed, corroded, or loose connection causing low voltage or short to ground — Open or high-resistance in signal wire, or connector contamination, pulls the signal low.1
  3. Reference voltage or ground supply issue to MAP sensor — Loss of 5 V reference or poor sensor ground biases the signal low; inspect power/ground circuits feeding the sensor.1
  4. Boost/intake leak or unmetered air affecting MAP reading at idle/low load — Large post-turbo leak can cause unusually low manifold pressure readings under conditions where ECM expects higher pressure.1
  5. ECM input fault — Internal ECM processing fault can misinterpret a good sensor signal as low.1

How to diagnose

  1. Verify code and freeze frame; confirm P0107 is present and note engine conditions at set.
  2. Visually inspect MAP sensor and intake plumbing for damage, oil contamination, and loose connections.
  3. Check MAP sensor connector for corrosion, bent pins, and secure latch.
  4. Inspect wiring harness from MAP sensor to ECM for chafing, heat damage, and proper routing.
  5. Using a scan tool, view live MAP/BARO voltage and compare to key-on/engine-off barometric reading and idle values.
  6. Check MAP sensor reference voltage and ground at the sensor connector with key on.
  7. If electrical tests are normal, inspect intake/boost plumbing for leaks, cracked hoses, loose clamps, and damaged intercooler boots.
  8. Clear codes and test drive to confirm code return and monitor MAP readings under load.
  9. If sensor and wiring test good but code persists, evaluate ECM input integrity.
  10. Document findings before replacing parts.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by region and shop. Electrical diagnosis typically costs less than parts replacement. Confirm failure with testing before replacing components.

When to see a pro

If wiring faults are found in the engine harness, or if ECM input testing is inconclusive, have a qualified diesel technician perform pinpoint electrical tests. Do not attempt repairs on high-pressure fuel or safety-critical systems without proper training.

Sources

  1. Curated DTC seed — 5.9 Cummins 24-Valve (VP44) (curated) ↩︎ ↩︎ ↩︎ ↩︎ ↩︎ ↩︎

Watch a repair

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

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