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Home / Codes / P0107
DTC code page

P0107: Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

Quick answer: The ECU sees the MAP signal voltage stuck lower than the normal operating range.

Drivers also search this fault as MAP sensor low input, baro sensor low voltage, MAP signal stuck low.

Severity: medium Family: powertrain Related paths: 8
Meaning

What P0107 usually means

P0107 means the MAP sensor signal is reading abnormally low voltage. Because low voltage usually corresponds to very high manifold vacuum, the ECU may believe the engine is under far lighter load than it really is. That can happen with a short-to-ground, failed sensor, poor reference voltage, or a vacuum condition that does not match real throttle position.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Look for an obviously unrealistic kPa reading on the scan tool compared with key-on engine-off atmospheric pressure.
  • Backprobe or test the signal, reference, and ground before ordering a sensor.
  • If the sensor uses a hose, make sure it is connected to the correct source and not pinched shut.
Driving risk

Can you keep driving?

Driving may be possible if symptoms are mild, but a MAP signal stuck low can create hard starts, weak acceleration, or stalling. Do not ignore it if the engine is struggling to stay running.

Moderate urgency: This code often allows short-term driving, but the right fix usually comes faster when you diagnose it early instead of waiting for more codes.
Symptoms

Common symptoms

Likely causes

Common causes behind this code

  • MAP signal wire shorted toward ground
  • Sensor internally failed low
  • Reference-voltage problem pulling the reading down
  • Wrong or collapsing vacuum source on remote-mounted MAP designs
  • Connector corrosion adding enough resistance to distort the signal

Cause phrases often tied to this code: short to ground, bad MAP sensor, signal wire fault, 5-volt issue, incorrect vacuum source.

Diagnostic order

Suggested workflow

  1. Confirm the MAP reading is implausibly low with the key on and engine off.
  2. Check for proper 5-volt reference and solid ground at the sensor connector.
  3. Test the signal circuit for short-to-ground or excessive voltage drop.
  4. Inspect the connector for moisture, green corrosion, or loose pin tension.
  5. Replace the sensor only after the circuit and pressure feed path prove normal.
Avoid guesswork

Common mistakes

  • Assuming low input means low engine vacuum instead of low sensor voltage.
  • Skipping key-on engine-off comparison, which is often the fastest way to spot a stuck-low MAP signal.
  • Missing connector corrosion because the sensor body itself looks clean.
Repair path

Practical fix guidance

  • Repair signal shorts, poor grounds, or damaged connectors before replacing the MAP sensor.
  • After the fix, verify the key-on reading is realistic and the engine no longer stumbles from bad load calculation.
  • Check fuel trims afterward if the engine had been running lean or unstable because secondary codes may clear only after a drive cycle.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0107

Useful when the driver knows the wording but not the exact DTC yet.

  • MAP sensor low input
  • baro sensor low voltage
  • MAP signal stuck low
Related search intent

Queries this page can answer naturally

  • P0107 code meaning
  • what does P0107 mean
  • MAP sensor low voltage symptoms
FAQ

Quick questions about P0107

What does low input mean on a MAP code?

It means the ECU sees the signal voltage below the normal range, usually from a short-to-ground, failed sensor, or related circuit issue.

Can P0107 cause stalling?

Yes. If the ECU badly misjudges engine load, idle fueling and spark control can become unstable enough to stall.