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Won't start...getting plenty of electrical power to lights,

Customer Question
Won't start...getting plenty of...

Won't start...getting plenty of electrical power to lights, swtiches, etc. Getting a U0401 diagnostic code when hooked to the scanner

Mechanic's Assistant: Just to clarify, what are the exact lights you're talking about?

Dashboard lights, interior lights, headlights come on.

Mechanic's Assistant: What is the model/year of your Jeep?

2012 Jeep Wrangler Unlimited Sport

Mechanic's Assistant: Are you fixing your Wrangler Unlimited yourself? What have you tried so far?

Haven't tried anything yet...drove fine...pulled up to my office. Went in and came back out to leave a couple of hours later and it won't turn over. Just clicks and all the dashboard lights come on

Submitted: 4 months ago.Category: Jeep
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Answered in 1 day by:
4/3/2018
Jeep Mechanic: sprinkles08, ASE Certified Technician replied 4 months ago
sprinkles08
sprinkles08, ASE Certified Technician
Category: Jeep
Satisfied Customers: 24,232
Experience: Chrysler/Dodge/Jeep Master Certified, ASE Master and Advanced Certified, Trans and Hybrid Specialist
Verified

Hello and welcome to JustAnswer! I apologize for the extended wait time you experienced, I've only just come online now and would like to assist you with your question.

U0401 sets in a module when it sees invalid data from the powertrain control module. It's very likely that your PCM is down preventing the engine from starting. It may be down due to an internal failure or it could be a loss of power or ground.

Are you hoping to do the required testing yourself?

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sprinkles08
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