What does the service code B2AAA mean? - 2006 Cadillac CTS

Where is this code coming from PCM/ECM - engine computer , BCM - body control module , radio ? What are you using to pull this code ?

this could relate to the OBD code P0672 , which is for #2 glow plug , is your vehicle a diesel ?if not i can only suggest giving a Chevvy dealer a ring and ask them ,as must be a chevvy based code for the own diagnostic equipment

This is not a valid code. You will find lots of hits online where people are reporting this code. It seems that the consumer grade scanning tools are not able to read the code correctly. I recommend taking it into the dealer and have them read the code.

it means this P0420, make appointment for service, should come out like this code but if you out of service do this remove BCM (Body control module), PCM, ECM tcm FUSEs, waited 30 mins, the reconnect them and put battery back on, or if you don't want to do that take the battery off, then go inside the car and turn the ignition on and the lights and anything ells you can turn on. they won't work but they will drain the voltage stored in them, leave like this for 15-40 min and then reconnect the battery should be back to normal. but turn every thing off again before putting the battery back on.

TRY TO RE SET AND SEE WHAT HAPPEN ,NO MUCH INFO.

This is a rheostat. It wears out. You should replace the TPS.

Code is nothing it is actually P0420. Catalyst efficiency under par. Check you don't have any mud or dirt built up on the downstream 02 sensor. Hope it helps.

Where an how did you come up with it ? Scan tool used , what module etc.....

i have download picture but not seen

Im not sure what the b2aaa is but the p0171 is bank one ( line of cylinder's that has #1 cylinder in it) is lean. This can just be a bad oxygen sensor.
I need to know more. Is the idle smooth? Is the idle at a good speed? (motor not reeving or going to slow)