Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com

6.0L Diesel Diagnostic Trouble Code (DTC) DescriptionsDTC Description Possible Causes Diagnostic Aids141 — Vehicle Speed The PCM performs • DTC 141 is set by the The PCM will not set DTCsSensor Signal Out Of diagnostic checks on the PCM when an out of for VSS circuit failure forRange Low VSS circuit when the range low condition is vehicles equipped withengine is operating at 0 detected in the VSS Allison MD (WTEC) andmph. The PCM transmits a circuit. 2000 series transmissions.voltage signal on the VSS • When DTC 141 is active For vehicles equipped withcircuit and determines if the amber ENGINE MD transmissions,the return voltage is out of indicator is not diagnose therange high or low. When a illuminated. communication circuitfault condition is detected,(CAN 1) between thethe PCM disables theengine and transmissioncruise control and powermodule.takeoff. If the road speedlimiting option is enabled,the PCM will limit enginerpm for all gears.142 — Vehicle Speed The PCM performs • DTC 142 is set by the The PCM monitors voltageSensor Signal Out Of diagnostic checks on the PCM when an out of on VREF A and will adjustRange High VSS circuit when the range high condition is signal values for theengine is operating at 0 detected in the VSS sensors that use VREF Amph. The PCM transmits a circuit. for operation. If a sensor orvoltage signal on the VSS • When DTC 142 is active circuit pulls VREF less thancircuit and determines if the amber ENGINE 5 volts, the PCM may setthe return voltage is out of indicator is not out of range high DTCs forrange high or low. When a illuminated. the sensors that operate onfault condition is detected,VREF B (APS, BAP, B+,the PCM disables theand VSS).cruise control and powertakeoff. If the road speedlimiting option is enabled,the PCM will limit enginerpm for all gears.143 — Incorrect CMP An inactive CMP signal • DTC 143 is set by the An inactive CMP signal willSignal Signature during cranking is PCM when the CMP cause a no start condition.detectable by the PCM. transition occurs at theDuring engine cranking the wrong CKP location.PCM monitors the CKP • DTC 143 can be set duesignal and Injection Control to a mistimed CMP toPressure (ICP) to verify the CKP signal, electricalengine is rotating. If the noise in the CMP circuit,CMP signal is inactive or a defective CMPduring this time a DTC will sensor.be set. Electrical noise canalso be detected by thePCM. When the level issufficient to affect engineoperation, a correspondingDTC will be set.(Continued)2004 F650/F750 6.0L Diesel