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Went to the gas station and top my tank off $60 worth of gas and my gas gauge stayed at E with the gas light on then my check engine light came on.

i looked up the code and got p0463 ''fuel level sens circ high input'' does anyone know what that is and whats causing that?

Thanks
 

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07 TBSS 1SS AWD
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#PIT3208E: 4WD Inoperative Erratic Fuel Gauge SIR Light Service Stabilitry Message - keywords 4.2 4.2L 5.3 5.3L ABS C0186 C0196 C0327 C0455 case communication connector inop IPC LH6 lamp light P0452 P0453 P0461 - (Dec 15, 2008)


Subject: 4WD Inoperative, Erratic Fuel Gauge, SIR Light, Service Stability Message


Models: 2004-2007 Buick Rainier

2002-2009 Chevrolet Trailblazer, Trailblazer EXT, Trailblazer SS

2002-2009 GMC Envoy, Envoy Denali, Envoy XL, Envoy XUV

2002-2004 Oldsmobile Bravada

2005-2009 Saab 97x




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This PI was superseded to update model years and connector clarification for new model years. Please discard PIT3208D.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A vehicle may exhibit: 4WD inoperative, SIR lamp, erratic fuel gauge operation and/or a Service Stability Message. Possible DTCs are C0186, C0196, C0327, C0455, P0452, P0453, P0461, P0462, P0463, P0464 and or U1088. A possible cause of these symptoms is a loose connection or backed out terminal(s) at the C101 or X101 connector (depending on vehicles model year), a 38-way connector mounted along the under hood fuse block. This harness may be routed tightly around the UBEC that could induce any of the concerns listed.

Recommendation/Instructions:
All terminal connections should be checked in this connector for integrity. Female terminals should be inspected for pin drag and Male terminal should be fully seated in the body cavity of the connector. Be certain that no terminals are bent or damaged in any way. Re-route the harness to prevent future harness and/or connector strain.

Note: When servicing this connector special care should be made not to damage other terminals. Fully seat the connector squarely with both hands and then latch the locking portion of the connector (CPA). Do not use the lock mechanism on the connector to pull the connector halves together as this may cause terminals to bend or a poor connection.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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DTC P0463
Diagnostic Instructions
• Perform the Diagnostic System Check - Vehicle prior to using the diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P0463: Fuel Level Sensor Circuit High Voltage


Diagnostic Fault Information
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance

Fuel Level Sensor Reference Voltage Circuit
P0462
--
--
P0461

Fuel Level Sensor Signal Circuit
P0462
P0463, P0464, 1
P0463
P0461

Fuel Level Sensor Low Reference Circuit
--
P0463, P0464, 1
P0463
P0461

1. Fuel Gauge Inaccurate or Inoperative


Circuit Description
The engine control module (ECM)/powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. The sender consists of a variable resistor that changes resistance based on the fuel level in the tank. The PCM monitors the voltage across the sender resistance in order to determine the fuel level. The ECM/PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel, in percent. The ECM/PCM sends the fuel level percent via the serial data circuit to the instrument cluster in order to control the fuel gauge. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

Conditions for Running the DTC
The ignition is ON, with the engine ON.

Conditions for Setting the DTC
• The fuel level signal is greater than 5 V.

• The above condition is present for greater than 20 seconds.

Action Taken When the DTC Sets
• The fuel gauge defaults to empty.

• The low fuel indicator illuminates.

• The ECM/PCM records the operating conditions at the time the diagnostic fails. The ECM/PCM displays the failure information in the Failure Records on the scan tool.

Conditions for Clearing the DTC
• The DTC becomes history when the conditions for setting the DTC are no longer present.

• The history DTC clears after 40 malfunction-free warm-up cycles.

• The ECM/PCM receives the clear code command from the scan tool.

Reference Information
Fuel Level Specifications
Fuel Level Specifications

Schematic Reference

• Instrument Cluster Schematics

• Engine Controls Schematics for the 4.2L engine

• Engine Controls Schematics for the 5.3L engine

• Engine Controls Schematics for the 6.0L engine


Connector End View Reference

• Displays and Gauges Connector End Views

• Powertrain Control Module Connector End Views

• Engine Control Module Connector End Views for the 5.3L engine

• Engine Control Module Connector End Views for the 6.0L engine


Electrical Information Reference

• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference
Scan Tool Data List

Circuit/System Verification
Ignition ON, observe the scan tool Fuel Tank Level Remaining parameter or the Fuel Level Sensor parameter. The reading should be between 4-98 percent.

Circuit/System Testing
Ignition OFF, disconnect the harness connector at the fuel level sensor.
Ignition OFF, test for less than 1 Ω between the low reference circuit and ground.
⇒ If greater than 1 Ω, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM/PCM.

Ignition ON, install a J33431-C Signal Generator and Instrument Panel Tester between the signal circuit and the low reference circuit. Vary the signal generator resistance between 40-250 Ω. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 5-95 percent as the signal generator resistance changes.
⇒ If not displaying the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the ECM/PCM.

Vary the signal generator resistance between 40-250 Ω. Verify that the fuel gauge displays a range that varies between empty and full as the signal generator resistance changes.
⇒ If the fuel gauge is incorrect, replace the instrument panel cluster (IPC).

If all circuits test normal, test or replace the fuel level sensor.
Component Testing
Measure the resistance of the float arm of the fuel level sender while moving the float arm between 40-250 ohms.

⇒ If the resistance does not move smoothly across the specified range, replace the fuel level sensor.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.



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Needs fuel sender!
 

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Discussion Starter #7
it when away later the night when i was driving so idk, but thanks for the info and everything
 
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