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Old 11-29-2021, 02:29 PM   #1
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Another DEF Code

It was below 30 degrees overnight and got this code when cranking. SPN 3363 FMI 5 OC 6. Error went away after approx 6 key cycles during our trip.

I understand that the 3363 FMI 5 may be low or high voltage at the pump. What is the "OC 6" stand for at the end of the code?
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Old 11-29-2021, 04:45 PM   #2
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From my SPN code list:

3363:

“Aftertreatment 1 Diesel Exhaust Fluid Tank Heater

Percentage of heating applied to the aftertreatment 1 diesel exhaust fluid tank heater. A value of 0% means no heating applied, a value of 100% means full heating applied. The diesel exhaust fluid tank heater warms the diesel exhaust fluid in the diesel exhaust fluid tank. See SPN 5137 for the command for this tank heater.“

This would make sense given you were in low temps and it cleared itself. Dont know about “OC 6” . 5137 just repeats the above word for word and sends you back to 3363.
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Old 11-29-2021, 05:54 PM   #3
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The “OC 6” means 6 occurrences of the code since last cleared.
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Old 11-30-2021, 04:03 PM   #4
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Quote:
Originally Posted by Archer2 View Post
The OC 6 means 6 occurrences of the code since last cleared.
Right - # of occurrences. Id forgot that one.
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Old 12-02-2021, 08:16 AM   #5
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Thanks to all for the great replies! They are most helpful.
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Old 12-02-2021, 12:29 PM   #6
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As long as it clears itself and doesnt leave a MIL lit, all is well. Of note though is that the valve for the heat loop in the tank can fail and when it does it fails open, so that the DEF in the tank gets overheated, leading to bad DEF. Some folks here who have experienced this have overridden or bypassed the heat loop by adding an exterior mechanical valve on the engine coolant lines that provide the heat for the system.

In some cases people have blocked it off entirely which would be fine if you never get into low temps. But even though DEF theoretically starts to freze at 12*F, Ive had DEF system issues when in the low 20s and high teens. So I see the system as necessary, but Im not opposed to adding a valve on the coollant (misleading term, but thats what it is) supply side so I have control over it if and when the internal valve fails. In a pinch () you could clamp it off with needle nose vice grips.
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