Cumminz

Cummins ISB CM850 (2003-06) Fault Code: 2558 PID: SID 57 SPN: 697 FMI: 4 Auxiliary PWM Driver #1 – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the analog torque circuit. Possible causes: 1)A faulty transmission shift modulator2)An short circuit to ground on the output device driver line3)A short pin to pin in the output device driver line. Possible repairs: 1)Replace the transmission shift modulator.2)Repair or replace the OEM harness.3)The removal and installation of the connector may correct the fault.4)Replace the ECM.

Cummins ISB CM850 (2003-06) Fault Code: 2559 PID: SPN: 1845 FMI: 4 Transmission ECU to ECM Communication Lost – Abnormal Update Rate. No communication or an invalid data transfer rate has been detected between the ECM and the transmission ECU. When this fault code is active, some multiplexed devices may not function as desired. Possible causes: 1)When the ECM is set up properly (components enabled and OEM VECU source addressed correctly) to receive information from an OEM VECU, but the OEM VECU is actually transmitting a message that says that component is not available for multiplexing. This can be caused...

Cummins ISB CM850 (2003-06) Fault Code: 268 PID: 94 SPN: 94 FMI: 2 Injector Metering Rail 1 Pressure – Data Erratic, Intermittent, or Incorrect. The ECM has detected that the fuel pressure signal is not changing. This fault code can become active any time the engine is loaded and the ECM detects that fuel pressure in the rail fuel is not changing. This fault code will become inactive whenever the ECM is powered down or if the ECM detects that the engine is loaded and the fuel pressure is changing normally. If there are many inactive counts of this fault...

Cummins ISB CM850 (2003-06) Fault Code: 269 PID: SID 217 SPN: 1195 FMI: 2 Antitheft Password Valid Indicator ? Data Erratic, Intermittent, or Incorrect. Engine ignition attempt without authorization from immobilizer anti-theft device. This fault code is active when the immobilizer anti-theft device has not been deactivated. The engine will not start until proper authorization has been activated. On-Board Diagnostics (OBD) Information: 1)The ECM illuminates the appropriate amber or red fault lamp when the diagnostic runs and fails2)The ECM turns off the appropriate fault lamp when the diagnostic runs and passes. Possible repairs: 1)The immobilizer anti-theft device has not been...

Cummins ISB CM850 (2003-06) Fault Code: 271 (Auto) PID: SID 126 SPN: 1347 FMI: 4 High Fuel Pressure Solenoid Valve Circuit – Voltage Below Normal or Shorted to Low Source. Electronic fuel control actuator shorted low. This fault becomes active when the ECM detects a short circuit in the electronic fuel control actuator circuit. Causes for this fault code are short circuit to ground or low resistance (electronic fuel control actuator coil is shorted internally) in the circuit for the electronic fuel control actuator. When excessive current or a short circuit is detected, the ECM driver to the electronic fuel...