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DTC codes / Chrysler codes / P1107

P1107 · ChryslerMAP Sensor Circuit Intermittent Low Voltage

P1107 on Chrysler vehicles means the powertrain control module (PCM) has detected an intermittent low-voltage condition on the manifold absolute pressure (MAP) sensor signal circuit. The PCM expects the MAP sensor to report a voltage that rises and falls smoothly with engine vacuum, and this code sets when the signal momentarily drops below the plausible range or glitches low during a key-on or running self-test.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Check engine light illuminated, often with no other noticeable symptoms
  • Intermittent rough idle or stumbling that comes and goes, especially over bumps or in wet weather
  • Momentary hesitation or surge during light-throttle acceleration
  • Poor fuel economy or black smoke from a rich condition if the low signal is frequent
  • Occasional hard start or stall after the engine is warm
  • A scan tool datastream showing MAP voltage dropping toward zero volts for a split second

Common causes, most likely first

  1. Chafed, cracked, or internally broken MAP sensor signal wire between the sensor and PCM
  2. Corroded or loose MAP sensor connector terminals, especially at the sensor pigtail
  3. Failed MAP sensor with an intermittent internal fault that opens when hot or vibrating
  4. Poor ground at the MAP sensor ground circuit or engine block ground strap
  5. Water intrusion into the MAP sensor connector or wiring harness from a missing splash shield
  6. PCM connector terminal fretting or a faulty PCM driver, though this is far less common

How to diagnose and fix it

  1. Inspect the MAP sensor connector and wiring for chafing, corrosion, or pushed-back terminals, then wiggle-test the harness with the engine running while watching MAP voltage on a scan tool
  2. Measure MAP sensor reference voltage and ground at the sensor connector with a voltmeter, comparing against battery voltage and chassis ground
  3. Back-probe the MAP signal wire at the PCM and at the sensor and perform a voltage drop test while flexing the harness to catch an intermittent open
  4. Check the MAP sensor ground circuit resistance to the engine block and clean any corroded ground points
  5. Replace the MAP sensor if the wiring and grounds pass but the voltage still drops out during a road test over rough pavement
  6. Repair or replace the affected section of harness with soldered and heat-shrunk connections, then clear the code and verify with a full drive cycle
  7. If the fault persists after all wiring and sensor checks, test the PCM connector terminals and consider PCM replacement only as a last resort

Intermittent MAP faults hide in the harness

  • A MAP sensor that tests perfectly on a cold engine can still set P1107 once heat and vibration open a hairline crack inside the sensor housing, so a bench test alone is not conclusive.
  • Chrysler PCMs often log P1107 from a single low-voltage glitch during cranking, which means a marginal battery or slow starter can mimic a MAP sensor fault.
  • Technicians who replace the MAP sensor without flex-testing the harness frequently see the code return because the real fault is a broken signal wire inside the loom near the intake manifold.
  • A leaking or restricted intake manifold gasket can cause vacuum fluctuations that make the MAP signal drop low intermittently, so check for vacuum leaks before condemning the sensor.
  • P1107 is sometimes stored alongside misfire or fuel trim codes, and clearing only P1107 without addressing the underlying lean or rich condition will bring it back.

Can I keep driving with P1107?

You can usually drive with P1107 because the fault is intermittent, but avoid heavy acceleration and long trips until it is diagnosed, since a sudden MAP dropout can cause a stall or a rich-running condition that damages the catalytic converter over time.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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