PACCAR MX (2004 Emissions) Fault Code: P1054 Downhill Speed Control Switches – Data Erratic, Intermittent or Incorrect
PACCAR MX (2004 Emissions) Fault Code: P1054 Downhill Speed Control Switches – Data Erratic, Intermittent or Incorrect
SET CONDITIONS:
The PCI ECU (D420) detects that both the downhill speed control activation and deactivation switches are active at the same time.
DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.
CORRESPONDING OBD READINESS MONITOR:
None
RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.
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:
Mechanical failure or damage to the downhill speed control switches
ADDITIONAL INFORMATION:
Downhill speed control keeps the desired vehicle speed at a constant level during descents.
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