The check engine light indicates that you need to service a vehicle soon. If your GMC Yukon has a flashing check engine light means that there is a catalyst damaging misfire (it can damage the catalytic converter and O2 sensors). If your vehicle has a flashing check engine light, it means you need to service … Read more
Your GMC Yukon‘s braking system is designed to handle thousands of miles of braking with no intervention from you. When its brakes begin to squeak, they are telling you that they need some attention. The most typical cause of squeaky brakes are the brake pads themselves, but there are other issues that can cause … Read more
P0406 is a generic OBDII Diagnostic code. It deals with the signal coming from the EGR system. In this case, it means that the signal coming from the EGR system is higher than the specified range Since it is a generic code, it has the same meaning for the GMC Yukon as it would … Read more
One of the most common (and inconvenient) problems with the GMC Yukon is when it has no heat coming from the heater. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not … Read more
P0405 is a generic OBDII trouble code. It deals with the signal coming from the EGR system. Since it is a generic code, it has the same meaning for the GMC Yukon as it would any other vehicle. The EGR system allows a certain amount of the Yukon’s exhaust to re-enter the combustion chamber, which … Read more
P0431 is a standard OBDII trouble code, which means that it has the same meaning for the GMC Yukon as it would any other vehicle. It is closely related to P0430 (which is one of the most popular OBDII codes). Warm Up Catalyst Efficiency → Below Threshold (Bank 2) When it’s the only trouble code … Read more
P0421 is a relatively rare OBDII trouble code. It’s generic, which means it has the same definition for the GMC Yukon as it would any other vehicle. It is technically defined as “Warm Up Catalyst Efficiency → Below Threshold (Bank 1)”. In layman’s terms, it indicates that your GMC Yukon’s catalytic converter is not scrubbing pollutants efficiently … Read more
P0411 is a general OBDII trouble code, which means that it has the same meaning for the GMC Yukon as it would any other car or truck. By definition, the code is letting you know that the ECM has detected incorrect flow in the secondary air injection system. P0411: Secondary Air Injection System → Incorrect … Read more
A relatively common, yet difficult to diagnose OBD-II trouble code is P0316. It has the same meaning for the GMC Yukon as it would any other vehicle. It indicates that there is a misfire at the startup of the vehicle, and that it happens within the first 1000 revolutions of the engine. P0316: Engine Misfire … Read more
P0740 is one of the most common transmission trouble codes. It means that the Yukon‘s computer has detected that there is an issue with the torque converter clutch (TCC) solenoid circuit. P0740: Torque Converter Clutch Circuit Malfunction The TCC “locks” the drivetrain, which allows for a true mechanical connection between the transmission … Read more