Getting mass airflow and knock sensor code at same time.
Thread Starter
Teching In
Joined: Jan 2019
Posts: 9
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Getting mass airflow and knock sensor code at same time. 2005 Hummer H2 6.0 with TRailblazer SS intake/TB/injectors, headers, full exhaust, and custom tune.
Last year I had a knock sensor go out so while the intake was off I had the shop swap it for the Trailblazer SS setup. It turned into a nightmare as the shop kept frying ECM's and my truck was there for almost two months.
Finally got the truck out of there with a preloaded ECM from Blackbear then took it to another shop for a tune that went well.
Now I am getting a CEL so I scanned it and saw mass airflow and knock sensor low voltage again :-(
I cleared the codes and it took a couple days but when the light came back on I pulled over and immediately scanned it. Same two codes.
It seems odd that I would get both codes at the exact same time.
Any ideas other than horrible luck?
Last year I had a knock sensor go out so while the intake was off I had the shop swap it for the Trailblazer SS setup. It turned into a nightmare as the shop kept frying ECM's and my truck was there for almost two months.
Finally got the truck out of there with a preloaded ECM from Blackbear then took it to another shop for a tune that went well.
Now I am getting a CEL so I scanned it and saw mass airflow and knock sensor low voltage again :-(
I cleared the codes and it took a couple days but when the light came back on I pulled over and immediately scanned it. Same two codes.
It seems odd that I would get both codes at the exact same time.
Any ideas other than horrible luck?
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,616
From: Central Cal.
I'm surprised I didn't use my best line, "Check ALL grounds!". I'm slipping.... lol
