: P0171 , p1400 and stabilitrak off reduce engine power

11-04-12, 07:56 AM
I have a problem with my 07 escalade esv the scan tool shows p0171 and p1400 then it flashes stabilitrak is off reduce engine power also ever once in Awhile I drive the car and I stop at the light on the dash the stabilitrak goes off, reduce engine power and traction control as well then the car shuts off when it shut off on i go to try to restart the car it doesn't do anything but show light on dash I'll leave for 2 min sit for 2 mins then the car turns on CAN SOMEONE HELP ME!!!!!!!!

11-04-12, 10:47 AM
P0171 is bank 1 lean this comes from the HO2S (heated oxygen sensor) and P1400 is a cold start emission reduction control system - This could also be an exhaust issue. Do you have an exhaust manifold leak? It is common for a mounting bolt a break off.

11-04-12, 02:09 PM
I put truck on the lift I check the exhaust and everything is fine I replug the scanner and now it shows p0121, p0171,p0174,p1400,p1516,p2101 so I change the air filter, I clean the Maf sensor and the throttle body also reset ck engine lite I drove for about 15 min so far so good lets see what happens now

Cadillac Cust Svc
11-05-12, 12:13 PM
Chinoblocks, I'm so sorry you've been experiencing these concerns! If you would like me to schedule an appointment at a dealership for you and/or check for any open recalls that may be on your Escalade, email me anytime at Katie_Lucille@gmexpert.com.

Looking forward to your updates,

Cadillac Customer Service

11-07-12, 08:21 PM
Since I change the air filter clean air mass flow sensor, and the throttle body the truck is running fine theses last couple of days

11-07-12, 09:41 PM
Check fuel pressure, I had the same codes and it turned out to be a bad regulator. The regulator is part of the fuel pump module so its all one unit.