2004 GMC Envoy XUV SLT.
Light on dash says Check Gauges. Information center says Oil Pressure Low..... Stop Engine. Oil
gauge fluctuates at  idle from 40 down to 0.

At acceleration pressure returns to 40-50. Oil registers full..... info center says 74%.
Have purchased switch oil pressure part (S4202), but unable to find part on engine to replace.
Where is Part located please?
Answer:
If you have the six cylinder engine, the oil pressure switch is located on the oil filter adapter
housing, right above where the oil filter screws on to- behind the cover under the truck, on the
passenger side, just above the large front stabilizer bar. If you have the eight cylinder engine, the
oil pressure switch is located behind the intake manifold near the firewall.

It is very difficult to reach on the V8, and you have to remove the intake manifold to gain access to
the oil pressure switch. You might want to check a few things before replacing the switch, such as
the PCV system, the current oil condition and level, just to be sure you don't have a major problem
causing an actual low oil pressure condition.


Question: Sir i have GMC Yukon coming signal on screen service traction control i just check by Tech2
find DTC steering position signal please help me thanks.
Answer:
The steering wheel position sensor is an integral part of the
Stabililtrak and traction control system on
your vehicle. With the code that is set, probably a C0455 I'm assuming, that is telling the system that it
can't determine the correct position of the steering wheel. Most times, the steering wheel position sensor
is what needs replaced, but you should always check the wiring going to the sensor for any breaks or
rubbing through down the column. If needed, sensor replacement is fairly easy. The lower steering shaft
needs to be removed from the column, as the sensor slides off downward. It's just a basic swap, and no
reprogramming or setup is needed after installation.

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GMC Envoy Oil Pressure And Stability Light Problems
Doug Said:
I just worked on 07 gmc envoy with low oil pressure problem,after replacing the oil pump&sending unit I found under pressure switch is a screen
that was stopped up. After replacing screen oil pressure was fine. Screen is about 5.00$ at dealership.

Sarge Said:
@doug, Great tip. Thanks Doug.