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HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALINSTRUMENT PANEL SYSTEM DISPLAYS, GAUGES AND CONSOLEDIAGNOSTIC INFORMATION AND PROCEDURESDTC P0462TEST DESCRIPTION
2005 Buick LeSabre Limited, 4T65E/M15

Test Description

2005 Buick LeSabre Limited, 4T65E/M15SECTION Test Description

The number below refers to the step number on the diagnostic table.

  1. 4:  This step tests for the proper operation of the circuit in the high voltage range.
DTC P0462

Step Action Value(s) Yes No
Schematic Reference: Instrument Cluster Schematics 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Fuel Level Remaining parameter in the powertrain control module (PCM) evaporative emission (EVAP) data list.
Does the scan tool indicate that the Fuel Level Remaining parameter is the specified value?		 0% Go to Step 3  Go to Diagnostic Aids
3 Is a DTC P0651 current in the PCM? - Go to DTC P0651 in Engine Controls Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect C420.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Fuel Level Remaining parameter.
Does the scan tool indicate that the Fuel Level Remaining parameter is the specified value?		 200% Go to Step 6  Go to Step 5 
5 Test the signal circuit of the fuel level sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 8 
6 Test the signal circuit of the fuel level sensor for a short to ground between C420 and the fuel level sensor. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 7 
7 Inspect for poor connections at the harness connector of the fuel level sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 11  Go to Step 10 
9 Replace the fuel level sensor. Refer to Fuel Level Sensor Replacement in Engine Controls.
Did you complete the replacement?		 - Go to Step 11  -
10 Replace the PCM. Refer to Diagnostic System Check - Vehicle in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 11  -
11
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 - Go to Step 2  System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.