03 December, 2025PACCAR MX (2004 Emissions) Fault Code: P060A PCI ECU – Internal Error PACCAR MX (2004 Emissions) Fault Code: P060A PCI ECU – Internal Error SET CONDITIONS:The PCI ECU (D420) detects that the programmed software in the ECU is not functioning correctly. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. POSSIBLE CAUSES:Reprogram the ECU Share on Facebook Opens in a new window. Tweet on Twitter Opens in a new window. Pin on Pinterest Opens in a new window. Back to blog