Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is***** high idle and load points toward a bad mass airflow sensor. Unplug sensor to see if it runs better, if so you can try to clean but if that doesn't help replace. The AWD disable light usually means the Differential Clutch Pump Actuator Check Valve has failed, here is a picture to help you locate. Let me know if you have more questions or if there is anything else I can do to help. Thanks.-https://www.dropbox.com/s/d2h82qkga1tsnp6/diff.PNG?dl=0-
I would recommend checking for vacuum leaks with idle problem if unplugging sensor didn't help. I do not have part number for differential actuator but it is the only electronic component on rear differential. If no vacuum leaks are found clean the idle air control valve incase it is sticking. Let me know how it goes or if you run into more questions, thanks.
That is correct. Let me know if you have more questions, thanks.
This code means one of modules are not communicating. You need to start by figuring out what module is setting code then checking connector condition, check power/grounds, and if good replace that module. This code would not be related to the check valve code. Let me know if you have more questions, here is info on code. Thanks.
Lost Communications With ECM/PCM/VCM
BCM, EBCM, IPC, Radio, SDM
DTC U1001-U1254 in Computer/Integrating Systems