Check Engine Code SPN 101 FMI 16 OC 3

[DancinCampers]

Was wondering if anyone has experience with this code. Freightliner 24/7 says it is thrown for Crankcase Overpressure, might be attributed to a filter located on top of valve cover for crankcase ventilation.

We are in Colorado, and experienced this code, the last number 3 indicates the number of times this code thrown, when going down from Monarch Pass , 11,300 ft, on Hwy 50, on east and west sides.

It only occurs when descending, exhaust brake in use. Never happens going up under full throttle or on level.

When coming down the east side, code was thrown 3 times, last time quickly went to stop engine code.

Each time I pulled over, retrieved code, turned engine off for a few moments. Restarted engine and code gone. Once we got past the 6 % downgrade everything back to normal.

My plan is to keep an eye on things on our way back to New Orleans, and then when settled, remove the bed to access engine.

Anyone else have this issue?

[D Lindy]

Rather then call Freightliner who makes just the chassis, call Cummins the maker of the engine that's throwing the codes, you'll get a more accurate answer as to what the code is after all it's a Cummins code.

[andyh]

I had that on my 2008 ISL. First step is to replace the crankcase filter. If that does not resolve the problem, replacement of the valve seals is the next step. In my case that was not enough, they had to replace the cylinder head to resolve it.


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[sdlowe11]

I got that code very intermittently under conditions similar to yours, although I never got the "stop engine" alert. Mine is a 2008 ISL. I recently replaced the CCV filter and haven't had the code again so far, but I also haven't had enough tough driving conditions to verify if that was the fix.

I think your plan is good. Replace the filter when you get a chance and go from there. I hope that takes care of the problem!

~Steve

[DancinCampers]

Thanks for the link Steve, now know what to look for.

[gatorcq]

A search on the Cummins QuickServe site



Circuit Description

The pressure inside the crankcase filter is measured by the crankcase pressure sensor. When the crankcase pressure sensor determines that the crankcase pressure is higher than normal, this fault code is logged.

Component Location

The crankcase pressure sensor is located near the crankcase breather filter. Use the following procedure for a detailed component location view.Refer to Procedure 100-002 in Section F.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the engine speed is greater than 500 rpm.

Conditions for Setting the Fault Codes

The ECM detects that the crankcase pressure is greater than a calibrated value.

Action Taken When the Fault Code is Active

The ECM illuminates the amber CHECK ENGINE light when the crankcase pressure limit is exceeded.
Conditions for Clearing the Fault Code

The ECM will turn off the amber CHECK ENGINE light as soon as the crankcase pressure drops below a calibrated value.

Shop Talk

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, calibrate the ECM. Use the following procedure in the corresponding Troubleshooting and Repair Manual for the engine being serviced.Refer to Procedure 019-032 in Section 19.

Possible causes of this fault code include:

Crankcase breather filter needs to be replaced
Crankcase pressure sensor damage
Plugged or restricted crankcase breather oil separator
Plugged or restricted crankcase breather oil drain tube or check valve
Plugged or restricted crankcase breather draft tube
Frozen, plugged, or restricted crankcase breather tube.
It is important to check for plugged or restricted hoses, tubes, check valves, oil separator, and filters in extreme cold ambient temperatures.

If Fault Code 555 becomes active due to a plugged filter before the maintenance interval is reached or the filter plugs frequently, see the Crankcase Gases (Blowby) Excessive troubleshooting symptom tree.