I guess I am an over achiever Check engine light came on with the following codes. What and where to start?

p0014
p0171
p0300
p0690
p2119
p2270
p2431

 

engine-codes.com is your friend. There is also a list of all the codes specific to the HUMMER on one of the forums, but start with the first page and then google search from there.

*Cam position sensor...
*Lean bank...

 

p0014 replace camshaft sensors. easy job.
p0300 clean the Throttle body, MAF sensor. Plugs, coils? are they old?
po690 Weak battery – Low voltage while cranking, bad Engine Control Module (ECM) relay Blown ECM fuse
p2119 throttle plate may be sticking. ecm again? Do you notice any performance issues, or any problems with idling or when you give it gas?

p2270 o2 sensors? not sure though
p2431 idle or stalling problem.

I've had several codes like this in the past and sometimes they can be related. WHen you fix the problem you may see some of the other codes go away too.

I would start with the easy and cheap fixes first. Take the Throttle body completely off the motor ad clean it. both sides. Clean the MAF. Prob. will have to replace o2 sensors too. then coil packs possibly and wires.

 

I would start with the battery and terminals. Any anomaly in the voltage can cause all kinds of crazy things to happen as in multiple codes. Good luck.

 

This is good advice. If you still have the OEM crappy battery terminals, search some of the threads on hacking those off for a better aftermarket set. Since I added my winch with Stinger terminals 4 years ago, no issues.

Do you still have the original battery? If so, likely at the end of its life as well.

 

It has the OEM ones. They will be gone this weekend.....I checked them right off and cleared the codes.....No codes yet...Thanks for the response...

 

Replaced the cam sensor, crank sensor, cam valve, spark plugs and cleaned the throttle body. No more codes and No further issues other than I had the radiator tank crack so I replaced it. H3 has been running great for a while but now that we are having 100 + temps I have noticed that the engine is running hotter and after sitting in traffic for a while it starts surging. Pulled the codes P2270 and P2431 are back. Gauge sits just above half way. Checked all the fluids, everything where it belongs. Could this be the downstream O2 causing the issue? I have one on order from RockAuto.

 

OK just came back from data logging the Temps and O2. High temp, with 101 outside air temp, was 212 in traffic and 197 going down the road. It was running 188.6 all winter and spring. Down stream O2 does not vary much at idle stays around 0.62 most of the time and the up stream O2 is running from 0.03 to 0.78 never stopping but for a few seconds. Going down the road the Down Stream does move but not much low of 0.43 to 0.62 and it stops for long periods of time. Sensor bad?

 

Wow! You're like jedi with your H3.
Chris