PCM u0121
 

I did some electrical work adding a gauge and used add a fuse. Now I'm receiving PCM 0121 communication error abs hu/cm. I won't be home for another four days so just making a list of things to try and if others have an input on this. Basic trouble shooting undo everything I did and see if that works.

-Going to check all fuses make sure I didn't do something stupid as didn't put a fuse back after pulling a couple
-take all add a fuses out and replace with original fuse
-check ecu harness
-check battery voltage
-disconnect battery and drain car of power

There was another thread about this similar thing after a big turbo install hoping I don't somehow have a harness wire cut. The car starts but cluster of lights on dash are light up and no power steering.

If there is another thread on this my bad. Google came up short for me.

where did you pull your power from?

Cigar 1 cigar 2 and wipers. I did pull a fuse that is labled swas put it back, not sure if that's the steering wheel angle sensor.

This thread is probably not in the correct area.. Oops

what fuse did you use??? because that code is definitely a CAN BUS code and usually another code is in the system that will incorporate that code with this one

This was what came up on cel codes

@CFI2008; did you ever figure this out? I've been getting this recently. only happens if i drive a short distance, shut it off, and come back to it.

Yea my dumb ass forgot to put a fuse back in...