p0203

[Meng918]

Hello LBZ's, My son and I just did Head Gaskets on his 2006 GMC. Truck ran fine before job... Now back together and she's throwing the p0203 code. Tuck is running rough/missing with a hint of raw fuel. Next we will probably switch injectors to rule out injector . Has anyone delt with this code and what fixed it.
Thanks...

 

[IOWA LLY]

Could be a poor connection. That's cylinder 3. Passenger side 2nd one back from the front.

But yes I've seen injectors go south immediately after doing a job like that. Usually from dropping debris in them. But sometimes you can't avoid it no matter how careful you are.


Sent from my iPhone using Tapatalk Pro

 

[Meng918]

So I went out and fiddled around with it. Changed injectors and found out that it's not an injector. Started checking wires and connections and found this...... Happy day.