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sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 22802
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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03 f350 4x4 lght on dash on and off when you start. Circuit

Customer Question

03 f350 4x4 lght on dash on and off when you start . Circuit breaker looks fine but turn to 4x4 and you get nothing not even a light
Submitted: 1 year ago.
Category: Ford
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

There are a handful of things that could be going on. Most likely a scan tool is going to be needed to look at data and to check for fault codes.

If you're seeing the warning light come on it is because a failure in the system is being seen and a fault code is setting. This could be a wiring issue, the module, or the switch, but the most common cause of a service four wheel drive light or the system not working is the transfer case motor.

If you're not actually seeing the warning light outside of when it does a bulb check then the problem may be the switch itself, it's signal can be looked at with a scan tool.