20 Most Recent 2005 GMC Sierra Denali - Page 5 Questions & Answers

Hello,
The question you are asking indicates you wanna know the ideal time to change the engine oil of your yukon.
The ideal time recommended by the manufacturer is after every 6months which is the time for the general servicing of the engine.
To achieve optimum perfomance of your car,it is recommended you carry out other actions,which includes the cleaning of the spark pluggs,oil filter and the fuel filter.


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You should be able to hear the pump run only when the key is first turned on for a second or 2. I would say the fuel pump is out. this happens when you run the gas out it can prematurely wear out the pump impeller. If you can hear the pump fire up check the fuel pressure at the fuel rail. the pressure for most GMs should be at least 33lbs to 50lbs if it is below this pinch off the return fuel line and recheck pressure. if under you have a bad fuel pump.
Thanks for using FixYa Hope this helps you out

If you follow the lines from the copressor it should be where the line changes from a rubber hose to a metal line when you find them both the hose that comes with a recharge kit will only fit the low pressure side port.

try new light bulbs, I have seen both burn out at the same time, or could be a bad dimmer switch.

It may be so badly rusted you will have to cut the cable

In most cases the wheels are ruined & can not be used

Do not put the spare back under there exposed to the weather
Leave it at home as I do, or put it inside the vehicle

I don't know where the tools are, but they have to be easy to find

You can look under the seats,read your owners manual,
actually call or stop by a dealer,they don't bite,or just ask
someone your next to with same vehicle

it sounds like front brake are wore out...

Yup. Check out this link. http://vatspasslockpasskeysecurityhelp.yolasite.com/

99 percent of the time it is the oxygen sensor.disconnect the sensor and check for b+ voltage at the connector if you have voltage it is your oxygen sensor.it is the first sensor in the exhaust pipe on the drivers side

Hi.

If the service 4WD light is on, then there is an issue with transmission or with 4WD module or switch. The truck must go to the dealer to do a code scanning. A general OBDII scanning like that done for free at Autozone will only pull down codes from main computer, not from Transfer Case Control Module (TCCM).That will not help. A code scanning at the dealer costs about $80.

A common fault that result in sudden 4WD failure and Service 4WD light turning on is a defective encoder sensor. The sensor is located in the shifter at one side of transfer case. If problem is the sensor you may get a code C0327. The sensor is tested reading voltage out. If sensor is working there will be a very little shift in voltages when you switch from 2WD to 4WD. The votage change is very little, and the sensor is difficult to test. See: .GMC Sierra Encoder Sensor Replacement
Other common fault is a defective 4WD switch. This can be tested using a multimeter.Sometimes it results in code B2725. Sometimes it is easier to replace the switch straight away if the code is present. There was a service bulletin reporting the switch problem on 2002-2003 trucks. If code B2725 is shown replace the switch.

There are more faults that can results in the same symptoms, but the two problems listed above are the most common. Problems such as a faulty TCCM do not occur very often.

Do a code scanning and check the two faults listed in my comments.

Some of the valves unscrew. you have to replace the top of the port. Look closely at the port you will see that it separates.

It's a T50 on most GM's

Check for cracked or dislodged vacuum hose.

It sounds like you probably have a bad instrument cluster. This is a common problem on GM vehicles.

If your A?C won't shut off, it isn't a fuse. I would tend to look at the switch.

This type of truck did have problems with the EVAP (evaporative emissions system) vent solenoid. There is a totally new vent solenoid available with a new tube and needs to be relocated. The main problem with the old vent solenoid is it would get water in the system, and quite often freeze, thus cracking the housing, or the water would simply seize the actuator in the vent solenoid. Its not likely related to the battery being low, but more to the cold temperature. I would clear the code, if possible, and wait to see if it returns. If it comes on immediately then I would suspect the vent solenoid is damaged and will need replacement. Code P0449 is most common.

Be sure and check the coolant level first, at the radiator after the engine has cooled

What is the make and model and itermittent problems are electrical issues. Usually with a horn it will be the contacts in the steering wheel. All vehicles with air bags have clocksprings. The are part of the restraint system and a majority of them contain the horn contacts built in them also. If it is not there then it will be a damaged wire or simply a failing horn.