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Yukon XL 2500

Defective ECMs are so rare that half of all warranty returns (industry-wide), once tested in a lab, turn out to be perfectly good. ECM updates (software) are another matter though. In the course of diagnosing something like this, it is...

As you may know, overheating can be caused by many different things such as a clogged radiator, a faulty thermostat, a bad coolant fan switch, or potentially a blown head gasket. The heater will usually not work properly when you...

Your symptoms seem to be similar to the situation where the linkage between the shifter handle and the transmission range selector may be loose or broken. In this event it may seem like the transmission range selections don't match up...

Since so many systems are transmitting problems, check the battery connections (https://www.yourmechanic.com/services/service-battery-cables). A simple check, but sometimes a faulty connection can cause all kinds of problems. Have a certified technician, like one from YourMechanic, scan the vehicle and pull all...

Hello, thank you for writing in. The vehicle may be having one of many issues. If you changed the starter because the vehicle was having starting issues, it may have been the battery causing you problems. If the fog lights...

The vehicles suspension system (https://www.yourmechanic.com/article/how-to-inspect-your-suspension-system) is made up of many components and to keep noise down. Many of them use rubber bushings. The soft rubber bushings do eventually wear out and may cause some misalignment. This may explain the noise...

There is a common issue among vehicles of this year model with the throttle position sensors (https://www.yourmechanic.com/services/throttle-position-sensor-replacement) on the throttle bodies. The reduced engine power warning may have also illuminated the Check Engine Light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) and stored a faults code....

With your vehicle it is possible that there may be a fault in your security system that is not allowing your truck to start. There may be a fault code stored in the computer of your truck that may help...