20 Most Recent 2008 GMC Yukon - Page 5 Questions & Answers

Is the dash light dimmer control turned all the way to off?

No such code's for your vehicle , cheap code reader ,.Take it to a qualified repair shop that has a professional scan tool . These are the correct code's for OBD2 https://www.engine-light-help.com/gmc-check-engine-light.html

Instrument Panel Fuse Block (Right) The right instrument panel fuse block access door is on the passenger side edge of the instrument panel. Fuse 21 - Sunroof Fuse 29 - Radio See pg 294/5 https://my.gmc.com/content/dam/gmownercenter/gmna/dynamic/manuals/2016/GMC/Yukon/2k16yukonden1stPrint.pdf Not sure where the DVD player gets power if not w/ sunroof.

Sounds like you need to replace all the spark plugs and dont foget to properly set the gap of the plug. Dont over tighten the spark plug. About a 1/4turn after contacting the head should be good for proper torque.It might even pay off to have a compression test done when the spark plugs are out.
Do these things before going further on your repair. Please let me know how things work out.

Check with a good mechanic.

The clutch in the torque converter could be slipping causing excessive heat. What is the transmission fluid temp?

in school we had one like that it was the throtle position sensor

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Run a hydrometer test on the battery to see if you have a bad battery cell.

If it has always been this way look for wires that at one time were switched. If it is now just happening one of the brake light bulbs may have a bad ground connection causing the electrical system to back feed. Pull out the brake light bulbs and check to make sure that there is no corrosion on the bulb or in the bulb connector. Also, if you pull a trailer or have the wire connections for a trailer you may have a wire problem there.

No it's not the orifice tube. Temp . actuator , electrical motor that switches door inside rear HVAC system from heat to A/C . stuck on A/C . Rear auxiliary heat and actuator overview repair for Yukon Tahoe Suburban...

I'm forwarding a YouTube video that shows the location and tools needed for this repair. There is only one cabin filter location. https://www.youtube.com/watch?v=SWoSdrTfj0w

The reduced power message to a protection program that the ECU activates when certain engine and transmission issues are detected. The engine light should be on and OBD2 codes will be stored. You need a code reader to find these codes and their meanings. Please borrow or buy this tool and write back. Also what do you mean the starting system is locked out? I don't know if you are writing about the antitheft system, shift interlock or a bad starter.

Hi. The sunroof glass is attached to two rails. You will need to open the sunroof completely and from the outside of the vehicle, look down at the rails. From your symptoms it sounds like it is "Out of Time". Look closely at the rails. I suspect either wear and tear or debris jammed up the components that guide the glass over and down into its closed position. If it doesn't make sense when you look at it. You can write back and explain what you have found or send it in for inspection. If the shop or dealer recommends replacing it, sit down first. Ya they are not cheep. Good Luck.

Yukon what ? just a plain yukon ? 2WD or 4WD XL - Denali etc... No pulse board . controlled by the BCM - body control module . Taking the vehicle to a qualified repair would be your best bet . Windshield Wipers The windshield wiper/washer switch signal circuits are inputs to the body control module (BCM) and the BCM controls wiper motor low speed operation, washer pump and high speed operation. The windshield wiper/washer switch is provided a low reference from the BCM and each of the switch signal circuits is supplied 12 volts through a resistor and monitored within the BCM. During LOW or INTERMITTENT operation the wiper switch low signal circuit is closed to the low reference circuit through a series of resistors within the switch assembly and the signal circuit voltage monitored by the BCM will depend on the switch contact location to the resistor assembly. During HIGH or WASH operation the high and wash switch signal circuits are closed directly to the low reference circuit within the switch assembly and nearly all the signal circuit voltage will be dropped across the BCM resistors. The BCM controls the wiper motor through the Wiper Relay and the Wiper High Relay. During any wiper motor function that uses low speed the BCM supplies the voltage to energize the Wiper Relay and battery voltage will be supplied from the Wiper Relay through the de-energized Wiper High Relay to the wiper motor low speed control circuit. During high speed wiper motor operation the Wiper Relay is energized as in low speed and the BCM provides a ground to energize the Wiper High Relay and the battery voltage is supplied to the wiper motor high speed control circuit. Wiper motor park operation is controlled by the BCM using an input from the park switch within the wiper motor assembly. The BCM supplies the park switch signal circuit 12 volts through a resistor then monitors the circuit. Whenever the wiper motor is out of the park position the park switch signal circuit is closed to ground and nearly all the signal circuit voltage will be dropped across the BCM resistor. When the wiper switch is turned to the OFF position while the wiper motor is somewhere in mid-cycle, the BCM will continue to operate the motor until the wipers reach the park position. If the ignition is turned OFF while the wipers are in mid-cycle, the wipers will stop immediately where they are and the BCM will park the wipers the next time the ignition is cycled ON.

DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance DTC P1518 Throttle Actuator Control (TAC) Module Serial Data Circuit DTC P0120 Throttle Position (TP) Sensor 1 Circuit DTC P0220 Throttle Position (TP) Sensor 2 Circuit DTC P0336 Crankshaft Position (CKP) Sensor Performance DTC P0463 Fuel Level Sensor Circuit High Voltage DTC U1001-U1254 Loss of Communications Use new parts not used . What would be better - take it to a qualified repair shop.

Please chk the headlamp control assy lever.

The bulb should be the problem .

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yes it does