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Vladgmru, Automotive Electrician
Category: Jeep
Satisfied Customers: 2668
Experience:  I've been working with American made cars since 1992.
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Wrangler JK Sahara Unlimited /Automatic - 4 door: Around 3

Customer Question

Around 3 weeks ago, my JK started to turn the overdrive off when driving on highways. For same time I also started to notice that is losing power (I have to push the accelerator to upshift / and maintain speed otherwise will downshift).
Check for errors and get a P012C code. (Turbocharger/Supercharger Inlet Pressure Sensor Circuit Low).
Could you tell me the possible cause and how to fix it?
Submitted: 2 years ago.
Category: Jeep
Expert:  Vladgmru replied 2 years ago.
Hello and welcome to JustAnswer.
My name is Vlad.
Is it a 2.8L diesel engine?
Customer: replied 2 years ago.

Hi Vlad. Thanks for you reply.

It is a 2.8 diesel engine.

Expert:  Vladgmru replied 2 years ago.
Hi Paulo,
Those 2.8L diesels are known for Turbo Air Charge hose leaking problems.
That usually results in underboost so you can experience lack of power, jerking and improper transmission shifting.
There are two hoses one from turbo to inter-cooler ( RH side) and another from inter cooler to intake manifold ( Lh side).
For some reason LH side fails more often.
Sometimes you can hear like a hissing sound when accelerating but sometimes nothing so it is worth to remove them and carefully inspect for any splitting/holes.
Usually you can see some oily spots when it is leaking.
If there is nothing wrong with turbo hoses, then it could be something with wires like intermittent short to ground ( chaffed wire touching metal part). This also happens pretty often as diesel engines vibrate.
Let me know about your findings .
Customer: replied 2 years ago.

Thank you so much for your input.

I will have a look and get back to you shortly.

Expert:  Vladgmru replied 2 years ago.
Sounds good.
Talk to you later.
Expert:  Vladgmru replied 2 years ago.
Hi Paulo,
I am just checking if my answer helped you or if you have more information and might need more assistance?
Please let me know