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Fuel level gage indicates low fuel every time I filled the tank full level.

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Do you have problems starting the vehicle? usually signs of faulty fuel pump. but if all is well. your going to have to drop the tank to replace the sensor located on the side of the fuel pump.

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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My gas gauge in my 2002 Pontiac Bonnivile shows empty all the time


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

Mar 29, 2017 | 2002 Pontiac Bonneville

1 Answer

2006 Chevy Colorado Truck. Gas tank filled and fuel gauge indicator dropped to 1/4 full, when truck is idling fuel gauge drops to empty and low fuel light comes on. Suggestions? Thank you.


Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

Jan 01, 2017 | 2006 Chevrolet Colorado

1 Answer

2002 chevy malibu cranks wont start. fuel and temp gauge dont work. radio reads cal


Cranks won't start , Did you check for spark ,fuel pressure ?
Radio Setup .Will the vehicle communicate with a scan tool ? Fuel an temp gauges not working are probably bad step motors inside the instrument cluster that controls the gauges . Where do the gauges read 0 or something else ?
Engine Coolant Temperature Gage
The IPC displays the engine coolant temperature as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the engine coolant temperature. The BCM converts the engine coolant temperature into a percent gage deflection. The IPC receives a message from the BCM via the serial peripheral interface (SPI) indicating the requested gage position. The engine coolant temperature gage defaults to 38°C (100°F) or below if:
?€¢
The PCM detects a malfunction in the engine coolant temperature sensor circuit.


?€¢
The BCM detects a loss of class 2 communications with the PCM.


?€¢
The IPC detects a loss of SPI communications with the BCM.

Fuel Gage
The IPC displays the fuel level as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the fuel level percent. The BCM converts the fuel level percent into a percent gage deflection. The IPC receives a message from the BCM via the serial peripheral interface (SPI) indicating the requested gage position. The fuel gage defaults to E (empty) if:
?€¢
The PCM detects a malfunction in the fuel level sensor circuit.


?€¢
The BCM detects a loss of class 2 communications with the PCM.


?€¢
The IPC detects a loss of SPI communications with the BCM.

When the fuel level is less than a pre-determined value, the low fuel 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 body control module (BCM). The BCM converts this data and sends a fuel gage percent deflection to the IPC via the serial peripheral interface (SPI) in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Have
For the DE 100 series radio, complete the following procedure, using a scan tool, in order to properly set up communication:

  1. At the Main Menu screen, select: Diagnostics.
  2. At the Vehicle Identification screen, select the following options:
  3. ?€¢
    Model Year


    ?€¢
    Passenger Car

  4. At the System Selection Menu screen, select: Body.
  5. At the Vehicle Identification screen, select the Platform type.
  6. At the Body screen, select: Radio.
  7. At the Radio screen, select: Special Functions.
  8. At the Special Functions screen, select: Radio Setup.
  9. At the Radio Setup screen, press ENTER. The following test will set up a new or existing radio.
  10. Select one of the following options:
  11. ?€¢
    USA/Canada


    ?€¢
    Export

  12. Press the ENTER key.
  13. Verify that the scan tool displays "Test in Progress."
  14. Verify that the scan tool displays "Test Completed Successfully."
  15. Press EXIT on the scan tool.
Important: The radio set up will configure the following systems:
?€¢
LEARN VIN


?€¢
Diagnostic Trouble Codes


?€¢
Class 2 Radio Messages


?€¢
Country Code


?€¢
Chime Volume


?€¢
Chime Level


?€¢
12/24 Hour Clock

Without learning the VIN, the radio will display a locked message (LOC).
The radio setup procedure will also clear the following messages:
?€¢
CAL


?€¢
CAL ERR


?€¢
CALIBRATE

May 29, 2016 | Cars & Trucks

2 Answers

02 blazer LS zr2 gas gauge when i turn the key the needle goes all the way to full then when i start the car it bounces a little between 1/2 and full and when im in drive is slowly comes down but is not...


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 low fuel indicator illuminates.

Hooking up a professional or factory scanner an checking input data to the PCM from the sending unit inside the fuel tank ,viewing the information sent to the IPC , Checking for diagnostic trouble code's .
DTC P0461
DTC P0462
Circuit Description
The fuel level sender changes resistance based on fuel level. The PCM monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is high and the PCM senses a high signal voltage. When the fuel tank is empty, the sender resistance is low and the PCM senses a low signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percentage in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and EVAP diagnostics.

Install a scan tool.
Turn the ignition ON, with the engine OFF.
With a scan tool, observe the Fuel Tank Level Remaining parameter in the PCM data list.
Does the scan tool indicate that the Fuel Tank Level Remaining parameter is less than the specified value?
1%

No DTC'S - diagnostic trouble code's stored ,use this diagnostic procedure
Fuel Gage Inaccurate or Inoperative
• Refer to Fuel Level Specifications in order to verify the correct fuel level sensor readings. The Fuel Tank Level Remaining parameter is available in the scan tool in the PCM data list.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step tests for a high resistance in the signal circuit and the low reference circuit of the fuel level sensor.
DTCs will be set in the PCM when you perform this diagnostic table.
Step
Action
Value(s)
Yes
No
Schematic Reference: Instrument Cluster Schematics
1
Did you perform the Instrument Cluster Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - Instrument Cluster
2
Disconnect C104.
Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sensor and the low reference circuit of the fuel level sensor on the male terminal side.
Turn the ignition ON, with the engine OFF.
Important: Verify the J 33431-C resistance settings with a DMM.
Vary the resistance on the J 33431-C from 40-250 ohms.
Refer to Fuel Level Specifications in order to convert from resistance to fuel gage display.
Does the fuel gage display the correct fuel level?

How to test fuel gauge tank sending unit P0463 GM

Dec 19, 2017 | Cars & Trucks

1 Answer

1999 chevy cavalier fuel gage


Most of the time the level sensor in side of the fuel tank is the problem. I'd say 1 out of 10 the cluster is bad. But with the way you say it was acting up before hand I'd put my money on the level sensor and not the cluster. The fuel tank will need to come out of the car to fix this. There is not access door to the fuel pump.

Nov 22, 2009 | 1999 Chevrolet Cavalier

1 Answer

Full tank of gas and getting low fuel indicator on dash


Bad fuel level sensor. Unfortunately it is located inside the gas tank. Fairly common problem on GM's. Due to sulphur in fuel. Corrodes the sensor tabs. Expensive to have repalced and NOT a do-it-yourself project, unless you have dropped a tank before.

Nov 02, 2009 | 2005 Chevrolet Trailblazer Ext

1 Answer

2003 Sorento EX 2WD Fuel level indicator problem.


the guage on the dash should not be bad it is more than likely the sending unit in the tank you will have to drop the tank and replace the pump. befor tearing anything down make sure the pump is plugged up and that it has a good ground.

Aug 29, 2009 | 2007 Kia Sorento 4x4

1 Answer

Fuel gage stock on full


Hello There

Your fuel level sender in your gas tank is faulty and needs to be replaced. This is a common problem.

Hope this helps. Please don't forget to rate me.

Many Thanks

May 20, 2009 | 2000 Buick Regal

1 Answer

Fuel level sensor in tank bad????


Yes it is all one unit, and yes that is what the problem is. don't use aftermarket parts, use OEM, (Delco Remy) they are much better quality.

Sep 08, 2008 | 2000 Chevrolet Blazer

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