P0107 Code: MAP/Barometric Pressure Sensor Circuit Low
The MAP signal has fallen to almost zero volts, usually from a lost 5-volt reference or an open signal wire.
At a glance
Severity: Moderate
- Meaning
- MAP/Barometric Pressure Sensor Circuit Low
- System
- Fuel & Air Metering · Powertrain
- Safe to drive?
- With caution
- Typical repair cost
- $0–$350
- DIY difficulty
- Easy
Near sea level a MAP sensor reads about 101 kPa with the engine off, and even on a hard closed-throttle deceleration it rarely drops much below 15 kPa. P0107 sets when the signal voltage falls under the lowest value the sensor can produce, typically below about 0.2 V, which would mean an almost perfect vacuum in the intake. No engine can pull that, so the cause is electrical: the sensor has lost its 5-volt reference, the signal wire is open or grounded, the plug is off, or the sensor's electronics have quit. Read literally, a near-zero reading tells the PCM the engine is barely loaded, so it switches to a substitute pressure worked out from throttle angle and rpm.
Can I keep driving? Usually drivable with care. Engines that rely on MAP may hesitate, pop back through the intake or stall, and automatics may shift early and soft; if several sensor codes appeared together and the engine barely runs, have it towed.
How to read P0107
- P Powertrain
- 0 Generic (SAE)
- 1 Fuel & air metering
- 07 Specific fault
Symptoms
- Check engine light on
- Hesitation and lean stumble when accelerating
- Hard starting or stalling on engines without a MAF sensor
- Early, soft upshifts that feel like slipping under load
- MAP reads 0 to 15 kPa in live data even with the engine off
- Other 5-volt sensor codes at the same time (throttle, EVAP pressure, A/C pressure)
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- MAP connector unplugged or not latched, often after throttle body, intake or intercooler hose work
- 5-volt reference open or shorted to ground, frequently by another sensor on the same circuit
- Signal wire open, or rubbed through to ground
- MAP sensor failed internally
- Corroded or pushed-back connector terminals
- PCM reference voltage driver fault
Diagnosis step by step
Read MAP with the key on and engine off
With the engine stopped, MAP must equal barometric pressure, about 101 kPa near sea level, which is roughly 4.5 V on a typical non-turbo sensor. A reading of 0 to 15 kPa or a signal under 0.2 V in this state proves the problem is in the circuit, not in engine vacuum.
Tools: OBD-II scanner
Measure the 5-volt reference
Back-probe the reference wire at the MAP connector with the key on: it should read 4.9 to 5.1 V. If it is at or near 0 V, look at the other sensors on the same reference; codes such as P0122 or P0641 confirm that the whole circuit has collapsed.
Tools: Multimeter
Find the sensor pulling the reference down
Keep the meter on the reference and unplug the sensors that share it one at a time, typically throttle position, EVAP pressure, A/C pressure and sometimes cam or crank sensors. When the voltage snaps back to 5 V, the last sensor you unplugged, or its wiring, is shorted.
Tools: Multimeter
Jumper the harness connector
Unplug the MAP sensor, turn the key on and bridge the reference and signal terminals on the harness side with a fused jumper. The scanner should show its maximum pressure or about 5 V. If it does, the wiring and PCM are fine and the sensor is dead; if it stays low, the signal wire is open or grounded.
Tools: OBD-II scanner, Multimeter
Check the signal wire for opens and grounds
With the battery disconnected and both ends unplugged, the signal wire should measure under 1 ohm from sensor to PCM and show no continuity to engine ground. Pay extra attention where the harness runs under the intake manifold or past the throttle body.
Tools: Multimeter
Where the parts are
- 1Ignition coil
- 2Spark plug
- 3Fuel injector
- 4Camshaft sensor
- 5Crankshaft sensor
- 6Engine computer (ECM)
- 7Intake manifold
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Reconnect and latch the MAP connector | Yes | $0 |
| Clean or repair connector terminals | Yes | $10–$80 |
| Replace MAP sensor | Yes | $60–$250 |
| Replace the sensor shorting the shared reference | No | $60–$300 |
| Repair signal or reference wiring | No | $100–$350 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Notes by brand
Field data
| Chevrolet | 3 | Cobalt, Trailblazer Ext, Traverse |
|---|
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.
Emissions / smog test impact
Will fail
With the check engine light on, the OBD-II check in state emissions programs is a fail. After repairing a shared 5-volt reference, clear all related codes and drive until every readiness monitor has run.
Frequently asked questions
Why did P0107 show up after I cleaned my throttle body?
On many engines the MAP sensor sits on or near the throttle body or intake manifold, and its plug gets disconnected or bumped during the job. Check that the connector is fully latched before looking any further.
Can a different sensor cause P0107?
Yes. The MAP sensor usually shares its 5-volt reference with other sensors. If one of them shorts internally, the reference drops and the MAP signal goes low with it, even though the MAP sensor itself is perfectly fine.
Will a vacuum leak cause P0107?
No. A vacuum leak raises manifold pressure, pushing the MAP reading up, not down. P0107 needs a signal lower than any real engine can produce, which only happens with an electrical fault.
Why does my automatic shift so early with P0107?
A near-zero MAP reading looks like almost no engine load, so until the PCM substitutes a default value, the transmission uses light-throttle shift points and low line pressure. That makes shifts early and soft, which can feel like slipping when you're actually accelerating hard.