Your dash can tell you what the code number is, under DIAGNOSTICS. Take the number and call the Freightliner or Spartan hotline and they'll tell you what it means. Most of these lights are a momentary glitch, but take 5-6 start/run/stop cycles before they automatically go out.
If you're on a Freightliner, you need to make sure the yellow check engine light times out, before turning the key to start, or you'll throw a code about 20 minutes down the road. That means, when you turn the key to the first position, all of your dash lights will cycle through, telling you that they're working. The yellow check engine light may take up to 20 seconds before it goes out. This means all of the computers had a chance to talk to each other.
The yellow light will need to go out after the restarts, before you can follow the above procedure.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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