How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask GMC Expert Your Own Question
GMC Expert
GMC Expert, ASE Certified Technician
Category: GM
Satisfied Customers: 10370
Experience:  30 yrs experience, ase certified, shop owner
Type Your GM Question Here...
GMC Expert is online now
A new question is answered every 9 seconds

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