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GMC Expert
GMC Expert, ASE Certified Technician
Category: GM
Satisfied Customers: 10370
Experience:  30 yrs experience, ase certified, shop owner
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102,PO-107, PO-137, PO-157 I want to know what these codes mean

Customer Question

My truck its givin these codes P0-102,PO-107, PO-137, PO-157 I want to know what these codes mean?
Submitted: 6 years ago.
Category: GM
Expert:  GMC Expert replied 6 years ago.
Welcome to just I'm here to help you and your 100% satisfaction is my goal. This is very commonly caused by a wiring problem or a faulty mass airflow sensor , While monitoring MAF Hz in scan data, wiggle the MAF sensor connector, check for response. If so, replace the MAF sensor connector pigtail. If OK, monitor the ignition feed to the MAF sensor, Pink wire, with a Digital Volt Ohm Meter. Verify that voltage remains near 13-14v. Monitor the ground to the MAF sensor also, Black/White wire, with a DVOM. Verify that voltage drop remains below 50 millivolts

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