Taking the vehicle to a qualified repair shop an having a full scan of all the control module's on the vehicle should be the first step in the diagnostic procedure , All the instrument cluster gauge function's start in the PCM - engine computer . Sent to the instrument cluster over the GMLAN serial data network .
Without testing we'd only be guessing . Probably has a U code stored in one of the module's pointing to a cause . Could be just a loose connection . Checking wiring harness connection's . Circuit Description
The communication among control modules is performed through the high speed GMLAN serial data bus, the low speed GMLAN serial data bus, and with RPO HP2 the high speed hybrid GMLAN serial data bus. The modules that need real time communication are attached to the high speed GMLAN busses. There are several modules that act as the gateway module or translator for communication between the various serial data busses. With RPO HP2 the serial data gateway module (SDGM) is the gateway and on all others the body control module (BCM). All high speed modules are activated by a communication enable or wakeup circuit from another module as determined by the power mode master (PMM).
Refer to Data Communication Schematics to determine the circuit and module that activates specific high speed modules.
Signal supervision is the process of determining whether an expected signal is being received or not. Some messages are sent on a periodic basis and are interpreted as a heartbeat of a device. If such a signal is lost, the signal supervision part of the software will set a no communication DTC (U. code) against the missing device. This code is mapped on the Tech 2 screen as a code against the physical device. A lost communication DTC typically is set in modules other than the module with a communication failure.
Speedometer
The IPC displays the vehicle speed as determined by the ECM. The IPC calculates the mileage based on the serial data vehicle speed information from the ECM. The speedometer defaults to 0 km/h (0 mph) if the IPC detects a loss of serial data communications with the ECM.
Tachometer
The IPC displays the engine speed as determined by the ECM. The IPC receives a serial data message from the ECM indicating the engine speed. The tachometer will default to 0 RPM if:
• The ECM detects a malfunction in the engine speed sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
CAN Communication Problem
How to Diagnose Controller Area Network CAN
http://www.bbbind.com/free_tsb.html free wiring diagrams here . Enter vehicle info. year , make , model an engine size . Under system click on body & accessories , then under subsystem click on communication systems . Click the search button ,then the blue link's . Communication network diagrams .
SOURCE: 2005 gmc yukon xl denali service ride control
it has to do with your air ride suspension best bet is take it to the dealer there is probably a problem with a level sensor. hope this helps you
SOURCE: What the normal transmission temp Yukon Denali XL 2008
TRANSMISSION FLUID NORMAL TEMPERATURE IS 200 DEGREES.
SOURCE: gmc yukon has the abs & parking brake light
you have to fix the problem with ur brakes- first check the wiring ,connectors and connection clips to the abs sensors and modulator if looks ok than have truck scanned some auto stores such as auto zone / advanced auto do it for free the code will give u a start point towards fixing ur problem--visual inspection of brakes doesnt always show problem
SOURCE: HOW DO I RESET THE CHANGE OIL LIGHT ONCE THE OIL
look in the manual......turn the ignition to the on position not starting it of course and then pump the gas petal 5 times then the light will blink a few times turn off then back on...problem solved
SOURCE: Speedometer not working properly
There was not a recall, but there was a class action settlement where GM agreed to extend the warranty on certain vehicles for this problem. Check www.gmspeedometerrecall.com to see if you qualify.
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