I swapped the dash cluster from my Yukon over to the truck and the one from my Yukon jumps right on full but the cluster from my truck into my Yukon works fine. Also when you shut off the ignition switch it still stays on full. I've tried everything and I'm stuck. Any help would be great.
It helps to know how it works ! The fuel level sending unit is a input to the VCM - engine computer . The VCM needs this info so it can do evap. emission leak detection testing ! The VCM sends this info. to the instrument cluster via the class 2 serial data network .
U.S. Federal regulations require that all automobile manufacturers establish a common communications system. This vehicle utilizes the Class 2 communications system. Each bit of information can have one of two lengths, long or short. This allows the vehicle wiring to be reduced by the transmission and reception of the multiple signals over a single wire. The messages which are carried on Class 2 data streams are also prioritized. In other words, if two messages attempt to establish communications on the data line at the same time, only the message with the higher priority will continue. The device with the lower priority message must wait. The most significant result of this regulation is that the regulation provides the scan tool manufacturers with the capability of accessing the data from any make or model vehicle sold in the United States.
Hooking up a factory tech 2 scan tool to view sensor data inputs to an from the VCM an checking for DTC'S - diagnostic trouble code's is the proper way to diagnose .
DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage
The Fuel Level sensor is an important input to the VCM for the Enhanced Evaporative System Diagnostic. The VCM needs the fuel level information in order to know the volume of fuel in the tank. The fuel level affects the rate of change in the air pressure in the EVAP system. Several of the Enhanced Evaporative System Diagnostic sub-test are dependent upon the correct fuel level information. The diagnostic will not run when the tank is greater than 85% or less than 15% full. (This sensor signal disables the misfire when the fuel levels are less than 15%). This DTC is a type D DTC.
Action Taken When the DTC Sets
• The control module stores the DTC in history after the first failure but will not illuminate the malfunction indicator lamp (MIL).
Your best bet , take it to a qualified repair shop.
SOURCE: 2003 GMC Yukon - fuel pump
Check your ECM fuse. There should be 2 fuses for your ECM. It's the ECM that controls the function of the fuel pump. Good luck friend and it's also common for the wire harness from the frame to the fuel pump to go bad due to corrosion from the bad weather we get in the winter and rainy spring and fall.
SOURCE: 2002 GMX Yukon Denali XL will not start and battery has a charge.
get a boost to start it. after you start it let it charge up the battery on it's on. if it does not charge the alternator might be defective.
SOURCE: fuel gauge inop on 2005 envoy
Hi, this is a sending unit issue. you can try adding some Sea Foam additive to the tank. this may release the sender. if the additive doesn't work, replace the fuel level sending unit.
SOURCE: 2004 Yukon XL Denali fuel gauge fluctuations
You can get the codes checked and see if you have a level sensor code.The level sensors are known to go bad on these vehicles.Sometimes when you rock the vehicle it will start to work properly.What happens is the fingers on the level sensor wear out and it works erratically.You can get the level sensor separately from the fuel sending unit.Hope this helps.Good luck.
SOURCE: I have an '02 gmc yukon, stuck in 4 low.
Check for a blown fuse. use your manual to find fuse location. you can remove the shift motor and engage it manually, you need to remove front driveshaft.
Testimonial: "thanks for the help, wasn't what i wanted to hear, but oh well. At least we have a good GM dealer here. Happy New Year!"
175 views
Usually answered in minutes!
×