Chevrolet P1107: MAP Sensor Circuit Intermittent Low Input

What Does The Chevrolet P1107 Code Mean?

The manifold absolute pressure (MAP) sensor responds to changes in intake manifold pressure (vacuum). The MAP sensor signal voltage to the PCM varies from less than 2 volts at idle (high vacuum) to more than 4 volts with the key ON, engine not running or at wide-open throttle (low vacuum).

The MAP sensor is used to determine manifold pressure changes _while the EGR flow test diagnostic is being run, refer to DTC P0401. Also to update the barometric pressure reading (BARO), as an enabling factor for other diagnostics. The PCM monitors the MAP signals for voltages outside the normal range of the MAP sensor. If the PCM detects a MAP signal voltage that is intermittently low, DTC P1107 will set.

What Are The Potential Causes Of The Chevrolet P1107 Code?

Below are some potential causes of this DTC:

• MAP sensor signal circuit shorted to ground (intermittent fault)
• MAP sensor VREF circuit is open (intermittent fault)
• MAP sensor is damaged or has failed (intermittent fault)
• PCM has failed

How Can You Fix The Chevrolet P1107 Code?

Poor terminal connection

Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension.

Damaged harness

Inspect the wiring harness for damage. If the harness appears to be OK, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the display may indicate the location of the fault.

Powertrain Control Module

Inspect the PCM and the engine grounds for clean and secure connections

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> Manifold Absolute Pressure Sensor Map 213-4434 2134434 213-796 213796 16187556 12569240 12614973
>>> GM Genuine Parts 12633238 Engine Control Module

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• 2000 Chevrolet Camaro and Pontiac Firebird Service Manual – Volume 1, page 1059.
• GM, 2012, Service Bullettin – SES Light With DTCs P0106 P0107 P0171 P0300 P0502 P1107 P2431.
• GM, 2013, Service Bullettin – Prior To Any Circuit Testing.
• GM, 2018, Service Bullettin – PIP4409F SES Light With DTCs P0106 P0107 P0171 P0300 P0502
  P1107 P2431.