PACCAR MX (2004 Emissions) Fault Code: P0513 Immobilizer – Not Matched

PACCAR MX (2004 Emissions) Fault Code: P0513 Immobilizer – Not Matched

SET CONDITIONS:
The PCI ECU (D420) detects that the vehicle key code is not received or is incorrect.

DIAGNOSTIC CONDITION:
This diagnostic runs once after the ignition is keyed on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC will change to inactive immediately after the diagnostic runs and passes.

REPAIR VERIFICATION:
1. Clear all DTCs.
2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.
3. Did the DTC come back?
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. A temporary communication error between the immobilizer system and the PCI ECU has occurred. This is often the result of:
– Keying on the ignition very shortly after it was keyed off
– Uneven start-up of systems when the ignition is keyed on
– Occasional voltage drops during engine starting
2. No or intermittent CAN communication between PCI and immobilizer ECU
3. Malfunctioning immobilizer system

ADDITIONAL INFORMATION:
1. The immobilizer ECU transmits the vehicle key code to the PCI ECU through CAN. The PCI ECU accordingly enables or disables the fuel supply and the starter motor.

2. When this DTC is active, the fuel is not released, and the starter motor is inhibited.