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Cat Man
Cat Man, Cat Engine Expert
Category: RV
Satisfied Customers: 8813
Experience:  23 years Caterpillar Engine experience
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Just bought 03 horizon WD39 freightliner sith 330 cat. Cruise

Customer Question

Just bought 03 horizon WD39 freightliner sith 330 cat. Cruise won't set. Freightliner soent 6 hours with computors, sent me down the road with no fix. Anything simple Ican check or do I just do without as I've spent all the kabor money Ican.
Submitted: 2 years ago.
Category: RV
Expert:  Cat Man replied 2 years ago.
Hi. Thanks for asking your question! I will try and help you out.
I would suspect there a problem with the trans neutral safety switch. Or the cruise on/off or set/resume.
They should have been able to verify these inputs at the dealer. There could be a bad switch or damaged wiring to the switch.
If it turns out to be OK. I would next suspect the ECM cruise limit for cruise is programmed wrong. Or the ECM is not receiving a vehicle speed signal.
Please reply back if you need more help or have more questions. I am happy to assist.

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