What Does P0107 Mean?
The manifold absolute pressure sensor circuit is outputting a voltage below the minimum expected threshold. The PCM interprets this as an impossibly high vacuum (low absolute pressure) that does not correspond to actual conditions. This typically indicates an electrical problem such as a short to ground on the signal wire, a failed sensor, or a wiring issue. The driver will notice poor drivability including lean running, hesitation, and the MIL.
Common Causes
30%
Short to ground in the MAP sensor signal wire
25%
Faulty MAP sensor with internal short pulling signal low
20%
Corroded or damaged connector causing signal ground fault
15%
Missing or low 5V reference voltage to the MAP sensor
10%
Water intrusion in the MAP sensor connector or vacuum port
Diagnostic Steps
1
Check the MAP sensor PID with key on, engine off — it should read near barometric pressure; a reading near 0 kPa or 0V confirms the low circuit condition.
2
Unplug the MAP sensor connector — if the PID jumps to approximately 2.5V or mid-scale, the wiring is OK and the sensor is shorted internally; if it stays low, the wiring is shorted.
3
Measure the 5V reference at the MAP sensor connector with the sensor unplugged — if absent or low, check other sensors sharing the same 5V reference; one shorted sensor can pull down the entire reference line.
4
Inspect the signal wire routing for chafing against ground points or metal brackets that could cause intermittent shorts.
5
If the reference and ground are correct but the sensor output is still low with it unplugged, check for a short between the signal wire and the ground wire in the harness.
Estimated Repair Cost
$40 - $250
Parts + labor, varies by vehicle and location
The manifold absolute pressure sensor circuit is outputting a voltage below the minimum expected threshold. The PCM interprets this as an impossibly high vacuum (low absolute pressure) that does not correspond to actual conditions. This typically indicates an electrical problem such as a short to gr...
The most common cause of P0107 (Manifold Absolute Pressure/Barometric Pressure Circuit Low Input) is: Short to ground in the MAP sensor signal wire
Typical repair costs for P0107 range from $40 to $250, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The engine will run poorly with incorrect fuel delivery and timing. The PCM will use a default MAP value, but drivability will be significantly impacted. Drive cautiously to a repair facility. The engine may stall or hesitate at the worst times.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0107 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering System
Difficulty
Type
Generic (SAE)
Recommended Tools
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