GMC Sierra - Popular Questions, Answers, Tips & Manuals - Page 2

Maybe vehicle speed sensor has a problem?

Air filter are often mounted on top or to the side of the engine. The top mounted filters are usually a round ring filter you fit into a metal 'pan' shaped container positioned right on top of the engine. It will be fastened shut with either clips around the edge or a Wing nut in the centre of the lid. Release the clips or unscrew the wing nut and lift off the lid. The filter should lift out, drop in the new one, refit the lid and refit the clips or the wing nut. The side mounted filters are often positioned over towards one of the inner fenders and can sometimes be more of a pain to change. They use a slab filter usually about the size of a large book. Look for a big, wide plastic tube, (likely to be 2 to 3 inches wide), coming from the top of the engine over to a large black plastic box. This will be held closed with either screws or 'hook over' clips. The box will have a rib going all the way around the sides. This is where the fasteners will be. Check all four sides for fasteners ( I've missed screws or clips and wondered why the lid won't come off). You might need to wiggle the lid high enough to slide the filters in and out. Fit the new filter the same way up as the old one the refit the clips/screws.

Bulbs do dim over time but they shouldn't be 'that' dim. With the engine running. Remove a bulb and use a test meter to test the voltage at the bulb socket, it should be between 12.5 and 13.2 volts. The with the engine off, test the voltage at the battery terminals. It should be just over 12 volts. Then test the bulbs with 2 wires to the battery. Spray the bulb sockets with WD40. Are the back reflector surface of the headlights in good condition? Have you polished off any yellowing and dirt from the headlight plastic lenses?

Nobody has a diagram. The smallest ones usually go in the cylinder head

Reminiscent of a car of the past with a cracked oil filled ignition coil that lowered the oil level so the spark shorted internally on left hand corners but ran well at all other times - it took a while to find the fault... Another car of my experience behaved exactly like yours - more throttle is mostly applied when moving off forwards than reverse and consequently the power unit moves further in reaction on it's mountings stretching wires and pipes more. This car had a damaged connection that moved and lost contact unless driven very gently...

I would start with the oil pressure sending unit. These can fail. Often replacing them will then have correct oil pressure readings. Oil filters (all of them) are designed to allow oil to flow through them or around the filter media if it's plugged thus not starving the engine of oil flow and pressure. So it is unlikely that is the problem.

From your description it would seem the towing electrics have been incorrectly wired or perhaps the problem is with your trailer. My advice is to go back to basics, get yourself a diagram and investigate as deep as necessary. Your car is probably filled with digital electronics including a multiplex lighting system. If the towing electrics are an official GM kit there should be no problems but if it has been wired the old fashioned way a multiway relay should be used to prevent the trailer drawing/interfering with the multiplexed vehicle lights. That is the safest way but it does mean the circuit becomes more complex.

Hi friend, firstly on the main command where you can control all the windows has a button that when you put it off only the driver's window will work, so you have verify if the button is not activated!! .if it's not activated then you will have to control the fuse related to the windows, an if all the fuses are fine then go to the windows motor .

Take it to a qualified repair shop.

Generally it is located on the top of the fuel pump module external of the tank. On your model it should be the black box on top like the one in this picture.

Sounds like a shifting linkage problem under the vehicle.

1. Defective hood latch 2. Latch in need of lubrication

Replace the fuel filter and have the fuel pressure and flow checked

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Have you check the light bulbs

ABS sensor wiring became disconnected?

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Could be something as simple as the connection came unplugged. If not, disconnect it at the lug and check it with a test probe to see is there power from the harness to the motor. If no power, check fuses and connection at the sending unit.