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11. Engine Diagnostics and Codes
Name Description Trouble MIL Buzzer Reduce Comments
Code Lamp RPM
Boost Control ECM detects either an over boost or problem with circuit. 66035 X X Only applies to supercharged engines.
Barometric Sensor
Sensor alerts ECM if barometric measurement is to high or to low.
108 X
Cam Phaser ECM sets code if sensor fails diagnostic test. 65570 X X Limits RPM to 4000. Often caused by high or low engine oil level.
Cam Sensor ECM sets code if sensor fails diagnostic test. 65723 X
Cam Gov Message ECM sets code if specific OEM controller message is lost. 65560 X Normally only applies to tow sport applications.
Cam Bus Hardware ECM sets code when it detects problem with can bus circuit. 65559 X
Catalyst Efficiency Test ECM detects failed catalyst efficiency test. 65675-76 X 75 indicates odd bank, 76 even bank.
Coolant Temp Sensor Sensor fails diagnostic test. 110 X
Coolant Temp Warning Sensor alerts ECM if coolant temperature is above 220° F. 110 X Code clears at 95° F. Reduces RPM to 2500.
Coolant Temp Warning Extreme Sensor alerts ECM if coolant temperature is above 239° F. 110 X X X Code clears at 220° F. Reduces RPM to 2500.
Crank Sensor ECM sets code if sensor fails diagnostic test. 636 X Typically won’t start if code is triggered. Check tightness of
sensor and electrical connections.
EST ECM sets code if ignition coil fails diagnostic test. 65541-48 X Last digit corresponds to coil number.
Electronic Throttle Control ECM sets code if dual sensors out of range. 65604-05 X X Limits RPM to 1000. Check pedal adjustment.
Electronic Throttle Control ECM sets code if dual sensors do not agree. 65610-13 X X Limits RPM to 1000. Pedal may need replacement.
Electronic Throttle Control ECM sets code if it detects throttle body issues. 65615-18 X X Limits RPM to 1000. Check for stuck throttle body blade.
Fuel Pressure Sensor Sensor fails diagnostic test. 94 X
Fuel Pressure Error Sensor alerts ECM if fuel pressure is too high or to low. 94 X X Check or replace filters. If problem persists then further
diagnostics needed. Reduces RPM to 2500.
Fuel Pump Relay 1 ECM detects abnormal relay current or voltage. 66017 X
Fuel Pump Relay 2 ECM detects abnormal relay current or voltage. 66025 X
Gear Temp Sensor alerts ECM if gear oil temperature is above 300° F. 174 X X
Not normally used in jet or repower applications. Used for Towboats.
Knock Sensor ECM sets code if sensor fails diagnostic test. 65551-52 X 51 indicates odd side. 52 even side. Cooler pump relay.
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