Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Recommended Posts

As the title says, I have multiple sensors that are throwing codes. The truck (99 silverado 2500, 6L) started bogging/choking when given more than half throttle and there was a really strong fuel smell in engine bay. Put a code reader on it (using universal odb2) and got "bank 2 lean condition" and a couple of bank 2 o2 faults. Upon inspection, i found a broken weld at the exhaust pipe flange. I fixed the weld, replaced the k&n air filter with a paper one and cleaned the MAF and throttle body. This fixed the choking issue but CEL came on again, when I checked for codes using the "OEM specific" setting, I got 41 faults! I won't list them all but each o2 sensor had multiple codes, heater fault, insufficient data, high voltage AND low voltage. Also got similar faults for ETC, knock sensors, EGR and TCC, amongst others. Aside from abysmal fuel economy (stays in open loop fuel mode despite normal engine temp of 100° C) the truck seems to run, drive and shift normally so I'm guessing it's a short(s) in the electrical system. Not very familiar with electrical systems so any insight would be greatly appreciated. 

Link to comment
Share on other sites

Update-  The lean bank 2 DTC hasn't shown up since fixing the exhaust leak. As for all the sensor codes, I have checked all the wiring harnesses for damage and found none. Even checked underside of the fuse box. I put a voltmeter on all the sensor connections and they all read within .05 of 5 volts. From everything I researched, this is right where it should be. Could it be a faulty bcm or pcm? Should I even bother as driveabillity doesn't seem affected?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.