2008 GMC Yukon Xl 4WD - Answered Questions & Fixed issues
Started with Oil Pressure dropping
DTC P0521: Engine Oil Pressure (EOP) Sensor Performance
The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5 volts to the EOP sensor via the 5-volt reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the EOP sensor voltage is within the normal operating range of approximately 1-4 volts. When the engine oil pressure is high, the EOP sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via GMLAN serial data message.
Conditions for Setting the DTC
P0521
The ECM detects that the difference between the predicted oil pressure and the actual oil pressure is either less than 47 kPa (6.8 psi) or greater than 50 kPa (7.3 psi).
Your best bet ,take it to a qualified repair shop that has the proper diagnostic testing equipment to diagnose this.
Low oil pressure
What are you going by to determine it has low oil pressure ? Instrument cluster gauge , low oil light ? Have you had a mechanical pressure gauge hooked to see what the pressure really is ?
I need to hook up
Look in your users manual that came with you Yukon. If it has provisions, you should be able to locate this wire harness just below steering column or alittle to the right.(they at least give you room to get in so you dont hit your knees, where they usually mt. it.) Good luck, best regards.
There is a horrible rattling noise in the front
It sounds more like a possibly bad CV joint in an axle shaft or internal differential problem. There is no mechanical linkage to the front axle, its all electronically controlled. The front suspension is pretty good there aren't a lot of rattle type noises created from it. I need more info to diagnose better. Does it do it only moving? or stopped? over bumps only? in 4wd only? while turning? certain gears or speed only?
MY 2008 GMC YUKON sometimes
usually problems like that are fuel related like a stopped up filter or something next time it happens check your fuel pressure while it is broke down.
My 2003 Yukon Denali XL won't go into 1st gear or
My guess truck wont move in forward gear. if moves when shifts to 1 or low bad forward sprag in trans if under 50000 mi contact GM get customer good will for defective part, This all true if you have a 4l60e or 4l65e trans
Speedo accuracy on a 2008 Yukon XL Denali
There is no natural margin for error, either it functions properly or it doesn't. The easiest way to be sure is to elevate the vehicle or atleast the drive wheels/tires make sure the vehicle is properly supported put it in drive set the cruise at 60 mph watch the odometer for 2 or 3 minutes and you should register 1 mile per minute if it is in fact functioning properly. Hope this helps
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