20 Most Recent 2002 GMC Yukon Denali - Page 3 Questions & Answers

When starting my truck it sometimes make a humming sound.

have a pressure test done on the pump and if faulty then replace it.

how can I tell if my coolant leak is coming from the water pump

it has a safety feature that kills the fuel pump when in a collision. there is a reset button somewhere, usually in the trunk. the location should be in your owners manual. reset that breaker and it should fire up..

It is not a resistance problem. As it operates normally, the cruise control is wired to the stop lamps and will operate only when it sees chassis ground through the stop lamps. When you tap your brake pedal, 12 volts is applied, the ground goes away and cruise is deactivated. Because the LED tails are diodes and only let current flow one way, the cruise cannot see ground and will not set or operate. The same symtoms would appear if you had original incandescent tail lamps and both brake lights were burned out.
The solution will be finding the wire from the cruise that senses the brake lights, and connecting it directly to the brake switch, IF the brake switch is grounded when the pedal is not pressed. You may have a relay wired to the brake pedal switch to make this happen. Seek a knowledeable car audio/accesory shop familiar with auto electrical to help you with this.
Good luck!

There is a throttle body relearn procedure. But requires a scanner.

P0300 indicates a random or multiple cylinder misfire. With the engine running rough unplug one coil at a time while listening for an RPM change or for the engine to run even worse. If there is no change from one or more coils than check those coils for spark. If there is no spark out one of the coils swap it with another coil. if there is still no spark replace the coil. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

I had the same till i replace all my belts

Gm cars and trucks use dex cool coolant.

i now for a fact that it is the egr valve . carbon balls in side you have to take it of and clean them out

Your ABS actuator pump is running ... needs to be checked by certified mechanic