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PACCAR PX-8 CM2150 (2007-09) Fault Code: 688 PID: 98 SPN: 98 FMI: 0 Engine Oil Level – Data Valid but Above Normal Operational Range – Most Severe Level. High oil level has been detected by the oil level sensor.

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.

Fault code 688 indicates that the oil level in the engine is much higher than the recommended oil level.

Other causes of fault code 688 may include:

1)The engine may have been overfilled with oil during the most recent oil change.
2)The fuel system may be leaking into the lube oil system. Check for fuel system faults or use fluorescent fuel system dye to identify leaks.
3)The cooling system may be leaking into the lube oil system. Check for coolant in the oil.

Possible repairs:

1)Correct the engine lubricating oil level condition.

PACCAR PX-8 CM2150 (2007-09) Fault Code: 687 PID: 103 SPN: 103 FMI: 1 Turbocharger 1 Speed – Data Valid But Below Normal Operating Range – Moderately Severe Level. Low turbocharger speed detected by the ECM.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 686 PID: 103 SPN: 103 FMI: 2 Turbocharger 1 Speed – Data Erratic, Intermittent, or Incorrect. An invalid turbocharger speed signal has been detected by the ECM.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 649 PID: SID 115 SPN: 1378 FMI: 11 Engine Oil Change Interval – Condition Exists. Change engine oil and filter.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 599 PID: SID 025 SPN: 640 FMI: 14 Auxiliary Commanded Dual Output Shutdown – Special Instructions. The engine protection limit has been exceeded for the dual outputs calibrated limits.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 598 PID: 167 SPN: 167 FMI: 1 Electrical Charging System Voltage – Data Valid But Below Normal Operating Range – Most Severe Level. Very low battery voltage detected by the battery voltage monitor feature.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 597 PID: 167 SPN: 167 FMI: 1 Electrical Charging System Voltage – Data Valid But Below Normal Operating Range – Moderately Severe Level. Low battery voltage detected by the battery voltage monitor feature.