Fuel Gauge Troubleshooting
Fuel Gage
The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The PCM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of class 2 communications with the PCM.
When the fuel level is less than a pre-determined value, the CHECK GAGES indicator illuminates.
DTC P0462
The fuel level sensor changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sensor in order to determine fuel level. When the fuel tank is full, the sensor resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the total remaining fuel (%) in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the IPC in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics
DTC P0463 (3.8L)
How to test fuel gauge tank sending unit P0463 GM
SOURCE: Filled up gas tank and gauge still shows empty. I
ethanol fuel effects the fuel sending unit ,even just 10% ethanol.New sending units from gm adress this.
SOURCE: 2001 Pontiac Firebird Gas float
check the connections to sending unit mounted in tank if conn. ok replace sending unit
SOURCE: Gas gauge reading is erratic.
Your sending unit is getting flaky - it's a known issue. You can repair it though, rather than buy a new sender.
Do not do this job with any more than a 1/4 tank of gas or you'll get a fuel bath in the trunk.
Here's a DIY procedure on how to do it - 99% of the time on these cars, when there's a gas gauge issue, it's the broken wire they show in the procedure. I was out of solder at the time I fixed mine, so I used barrel clamp connectors to crimp a jumper wire into place on the broken ends of the wire, and that fixed it permanently.
Here's the link:)
http://www.audiforums.com/forum/showthread.php?t=3621
Instead of replacing the sender, fix the visibly broken wire and it'll fix the failure.
SOURCE: 2002 Avalanche gas gauge problems
Gm has a real problem with fuel tank sending units. That is what is wrong. You need a fuel tank sending unit. You can only get them aftermarket with the whole fuel pump module, but you can buy them seperate if you buy it from the dealer.
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