Page 1281 of 5267
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
For a complete wiring diagramRefer to Section 8W.
Page 1287 of 5267

P0460-FUEL LEVEL SENDING UNIT NO CHANGE OVER MILES
For a complete wiring diagramRefer to Section 8W.
When Monitored:
Engine running and fuel level either below 15% or above 85% of capacity.
Set Condition:
The PCM sees low fuel, less than 15%, for more than 120 miles or fuel level does not change by at least 4%
for more than 250 miles.
Possible Causes
PHYSICALLY DAMAGED/DEFORMED/OBSTRUCTED FUEL TANK
FUEL LEVEL SENSOR
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.CHECKING FOR A DAMAGED/DEFORMED/OBSTRUCTED FUEL TANK
Turn the ignition off.
WARNING: WARNING: The fuel system is under a constant pressure, even with the engine off. Before test-
ing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released.
Inspect the outside of the fuel tank for defects.
Remove the fuel tank.
Remove the fuel pump module from the fuel tank.
Inspect the inside of the fuel tank for any obstructions or deformities.
Is the fuel tank free from defects?
Ye s>>
Go To 2
No>>
Repair or replace the fuel tank as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.FUEL LEVEL SENSOR
If there are no possible causes remaining, view repair.
Repair
Replace the Fuel Level Sensor.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
Page 1288 of 5267
P0462-FUEL LEVEL SENDING UNIT VOLTS TOO LOW
For a complete wiring diagramRefer to Section 8W.
Page 1291 of 5267
P0463-FUEL LEVEL SENSOR 1 CIRCUIT HIGH
For a complete wiring diagramRefer to Section 8W.
Page 1295 of 5267
P0500-NO VEHICLE SPEED SIGNAL
For a complete wiring diagramRefer to Section 8W.
Page 1298 of 5267
P0505-IDLE AIR CONTROL MOTOR CIRCUITS
For a complete wiring diagramRefer to Section 8W.
Page 1303 of 5267

P0513-INVALID SKREEM KEY
For a complete wiring diagramRefer to Section 8W.
When Monitored:
Ignition on.
Set Condition:
The Gateway detects that the Secret Key message is invalid or missing. One Trip Fault.
Possible Causes
WCM/SKREEM
POWERTRAIN CONTROL MODULE
GATEWAY MODULE
COMMUNICATION PROBLEM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.ACTIVE DTC
Ignition on, engine not running.
With the scan tool, read the Gateway Module DTCs.
Is the DTC active at this time?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.COMMUNICATION (CAN BUS or J1850)
NOTE: For vehicle communication problems, use the scan tool to refer to theNetwork Review Screen. The
screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting
any of the network components allows access to the source of the problem.
Does the scan tool display a Vehicle Network problem or NO RESPONSE condition?
Ye s>>
Refer to the appropriate BUS Communication test in the Section 8 ELECTRONIC CONTROL MODULE
- ELECTRICAL DIAGNOSTICS.
No>>
Go To 3
3.SKREEM/SKIM TROUBLE CODES SET
With the scan tool, check for SKREEM/SKIM DTCs.
Are any DTCs present in the SKREEM/SKIM?
Ye s>>
Refer to Section 8 - Electrical VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS and perform
the appropriate Diagnostic Procedure.
No>>
Go To 4
Page 1305 of 5267
P0522-OIL PRESSURE CIRCUIT LOW
For a complete wiring diagramRefer to Section 8W.