1999 Chevrolet Tahoe It won't start

Tiny
SARAH_TENNISON
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 22,300 MILES
It keeps throwing a code P0108 and we tried so many things my husband is getting Frustrated with the truck what can it be it sounds like it wants to start but it won't and it's also the throwing a code for it miss firing in number five can you please help me and my husband
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Thursday, July 31st, 2014 AT 7:56 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
P0108 - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

It's possible for the sensor to set that code, but it's much more common to find a wiring problem. Specifically, a break in the ground wire will set it, and a break in the signal wire could set it. Start by inspecting the wires to see if one is cut, and check any connectors to see if the terminals are stretched or corroded.
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Thursday, July 31st, 2014 AT 8:21 PM
Tiny
SARAH_TENNISON
  • MEMBER
Where is the ground wires at?
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Thursday, July 31st, 2014 AT 8:46 PM
Tiny
CARADIODOC
  • EXPERT
The map sensor is a three-wire sensor. All three-wire sensors have a 5.0 volt feed, a ground, and a signal wire. In this case the ground wire doesn't actually bolt to the engine or body like normal. It goes to ground through the Engine Computer so the computer can monitor it. The easiest way to test it is to measure for voltage on it. With the ignition switch on, you're either going to find the proper 0.2 volts or, if there's a break in that wire, you'll find close to 5.0 volts.
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Thursday, July 31st, 2014 AT 9:06 PM
Tiny
SARAH_TENNISON
  • MEMBER
Thank you. I have looked up the code P0108 and it keeps saying a MAP SENSOR but my husband replaced it and its not that it still wont start and its wants to turn over but it wont.
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Thursday, July 31st, 2014 AT 9:22 PM
Tiny
CARADIODOC
  • EXPERT
You missed the important comment in my first reply. Fault codes never say to replace parts or that they're bad. The sensor will only set that code about half of the time. The other half it's due to wiring problems. That's where voltage measurements will tell whether to replace the sensor or look for something else.
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Friday, August 1st, 2014 AT 9:10 PM

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