Cummins ISB CM850 (2003-06) Fault Code: 242 PID: 84 SPN: 84 FMI: 10 Vehicle Speed Sensor Circuit Tampering Has Been Detected – Abnormal Rate of Change. Invalid or inappropriate vehicle speed signal. Signal indicates an intermittent connection or VSS tampering. Verify that the feature settings for the vehicle speed sensor anti-tampering (Fault Code 242), application type and automatic transmission are set correctly. If any of these are set incorrectly for your specific vehicle and application, Fault Code 242 could occur erroneously. Driving techniques such as driving for extended periods of time in lower gears can log Fault Code 242. Fault...

Cummins ISB CM850 (2003-06) Fault Code: 2448 PID: SPN: 111 FMI: 17 Coolant Level – Data Valid But Below Normal Operational Range – Least Severe Level. Low engine coolant level detected. Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe? Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM. This fault code goes active when the coolant level inside the radiator top tank or surge tank drops below the sensor level. Fill the top tank with coolant. Possible repairs: 1)Add coolant to the engine. Cummins...

Cummins ISB CM850 (2003-06) Fault Code: 245 PID: SID 33 SPN: 647 FMI: 4 Fan Control Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the fan control circuit when commanded on. The fan control logic can be adjusted with the INSITE? electronic service tool. There are two choices: 12 or 24 VDC ON, or 0 VDC ON. For proper fan operation, the fan control logic setup with INSITE? electronic service tool must match the hardware configuration on the vehicle. This fault code is logged when the ECM commands 12 or 24 VDC to...

Cummins ISB CM850 (2003-06) Fault Code: 253 PID: 98 SPN: 98 FMI: 1 Engine Oil Level ? Data Valid But Below Normal Operational Range ? Most Severe Level. Very low oil level has been detected by the oil level sensor. If inactive counts of Fault 253 are logged in the ECM, it could be possible that the engine was running or keyed on while tilted at an angle severe enough to cause this fault to be triggered. Other causes of fault code 253 may include: 1)The engine may not have been filled to proper capacity during the most recent oil...

Cummins ISB CM850 (2003-06) Fault Code: 2554 PID: 95 SPN: 1209 FMI: 2 Exhaust pressure sensor circuit – data erratic, intermittent, or incorrect. An error in the exhaust pressure sensor signal was detected by the ECM. At key-on, before the engine is started, the readings for intake manifold pressure, barometric pressure, and exhaust pressure are compared. This fault code occurs if the exhaust pressure sensor reading is different from the other two. This check is only done once after the keyswitch is turned on. This fault will not occur while the engine is running. Possible repairs: 1)Replace the exhaust pressure...