gustavoAcabrera

2007 Suburban LT 1500 5.3 4WD having issues, the stabilitrack lights comes on from time to time, stays lit for a few seconds with alarm...and then goes off. Car seems to be ok, but today when parking like brake itself and refuse to move, or move very heavily (like on brake and forced). Reverse is more loose. I just parked it and begin to search. Error code is P0171 o2 sensor on fuel bank 1, but i do not think is related. 3 months ago the car did the same, and mechanic changed a couple of valve selenoids, and did run normal until 2 weeks ago when it did the same, so we completed installing new all 8 selenoids oem. I though the problem was resolved will all new selenoids, but no, it appeared again today..Car is inmobilized .and cannot used like that... cpuld it be the ECU ? need help on resolving this issue.....