20 Most Recent 2003 GMC Yukon Denali - Page 6 Questions & Answers

either the dash switch or relay switch seem to be defective

Have engine and ABS codes pulled, this will give you a starting point of what is going on. Checker, Autozone or O'Rielly can help with code retrieval .

contacts stuck together in your blower motor relay. Replace blower motor relay.

Hi Jose:The first place to start is to have Ride Control Module scanned for trouble codes, this requires a high end scan tool. Most common problem is the air compressor in the rear or a height sensor. Here is how the system works.Automatic Level Control Description and OperationThe RTD system is bi-state real time damping system. The Suspension Control module controls the suspension damper solenoids and suspension position sensors, along with parts of the automatic level control (ALC) system and electronic variable orifice (EVO) power steering system.The Automatic Level Control system consists of the following:• Suspension Control Module• Compressor/Leveling Module - Air Pressure Sensor - Exhaust Solenoid• Compressor Motor RelayThe objective of the Automatic Level Control System is to provide constant ride height at all load conditions. The Suspension Control module monitors body-to-wheel height, and vehicle speed.The Suspension Control module will use the rear body-to-wheel displacements and vehicle speed inputs to keep the rear trim height of the vehicle at its desired level.The electronic suspension control (ESC) system is bi-state real time damping system. The ESC module controls the suspension damper solenoids and suspension position sensors, along with parts of the automatic level control (ALC) system, if 1500 series.The ESC system consists of the following:• The ESC module• The compressor/leveling module, if 1500 series - The air pressure sensor, if 1500 series - The exhaust solenoid, if 1500 series• The compressor motor relay, if 1500 series• The steering handwheel speed/position sensor• The suspension damper solenoids• The suspension position sensorsHope this helps; also keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.Thank you for using Fixya, and have a nice day.

have you tried removing the battery terminal/disconnecting the battery for couple of minutes so the computer can reset.

This is the antitheft system shutting off the injectors , The ignition reads the key, and if it misinterprets the signal from the key, it will say UNKNOWN driver and turn off the injectors. Basically the truck thinks it's being stolen so it shuts down. It's actually SUPER common on GM vehicles. Here is a link about it.http://vatspasslockpasskeysecurityhelp.yolasite.com/

This is the Mass Air Flow Sensor. It's a screen-like device located on the air intake line to the throttle body. It measures the flow rate and density of air entering the engine. The code can mean a few possible things:1. Dirty Air filter2. Dirty MAF Sensor3. MAF Sensor wiring problemsTry replacing the air filter first. Remember that engine codes must be reset or they will remain in the computer even after repairs. If that doesn't work you can remove the MAF and clean it with a MAF Sensor approved spray cleaner. If you use the wrong cleaner you will destroy the MAF. If cleaning the MAF don't work, then replacement is indicated.

This a mass air flow meter code low frequency. Location it mounted to the air cleaner housing and piping goes to the throttle body a three wire sensor.

Need to check your coolant level under the hood. If it is good suspect water pump.

coil packs