p0108 code will start perfect?

2000 CHEVROLET SILVERADO
376,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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JWELCH78
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If codes are cleared, truck will start perfect.. Idle for maybe 30-45 seconds then cole out.. I replaced the maf, map, map pigtail, intake manifold gaskets, and tps... Still same issue...
Mar 14, 2026 at 1:48 PM
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STRAILER
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Hello,

Okay I have seen the exhaust system plugged up and cause this code, I would remove the bolts from the head pipe to allow the exhaust to escape.

P0108 - Manifold Absolute Pressure (MAP) Sensor Circuit High Input

Here is a video to help you

https://youtu.be/CORe9JyrexI?si=QLMIlQulA8JE2G7O&t=151

. Let us know how it goes. Ken
Mar 16, 2026 at 9:49 AM
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JWELCH78
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This truck has had the cats removed already.. it is straight piped
Mar 16, 2026 at 1:45 PM
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STRAILER
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Did it have this code before installing the new MAP sensor or did it happen after? If it was after you have a defective sensor and I would get another one. If it was before lets check the wiring, here is a guide to help with the wiring diagrams below to help with the test.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Let us know how it goes
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Mar 17, 2026 at 8:59 AM
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JWELCH78
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Will be checking the wiring tomorrow... It was getting the code before the new map..
Mar 17, 2026 at 2:07 PM
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STRAILER
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Okay sounds good, I have seen defective new sensors before.
Mar 18, 2026 at 8:19 AM
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JWELCH78
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5v good, ground good, signal .3 ohms...
Mar 18, 2026 at 12:11 PM
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STRAILER
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Yep, I would get another sensor, it can be failing when in operation.
Mar 19, 2026 at 10:11 AM