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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-24-2009, 04:49 PM   #1
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Default P0108



Manifold Absolute Pressure (MAP) sensor responds to changes
in intake manifold pressure. PCM supplies 5-volt reference and ground
for MAP sensor. MAP sensor provides a signal to the PCM relative to
pressure changes in intake manifold pressure (vacuum). A low voltage
signal, about 2 volts on VIN K or 1.5-2.5 volts on VIN 1, is sent to
PCM on signal circuit at closed throttle (high vacuum) idle. A high
voltage signal, about 4 volts or greater on both engines, is sent at
wide open throttle (low vacuum)

  • Hard to start
  • Long cranking times
  • Sputtering/missing
  • Loss of power
  • Poor shifting
  • Blowing black smoke
  • Poor fuel economy
  • Dies intermittently
  • SES Service Engine Soon light
  • Bad MAP sensor
  • Disconnected vacuum line
  • Open or short in the signal circuit
  • Open or short in the 5 Volt reference circuit
  • Ground circuit open or shorted
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obd2, obdii, p0108, p108

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