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Ronnie, ASE Certified Technician
Category: Jaguar
Satisfied Customers: 35599
Experience:  34 years as an Automotive tech
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Evening I have a jaguar x type 05 with charging problems

Customer Question

Evening I have a jaguar x type 05 with charging problems start 14.44 after the a/c and lights on voltage drop after couples of minutes battery light goes on and after another minute just stop charging
Submitted: 1 year ago.
Category: Jaguar
Expert:  Ronnie replied 1 year ago.

Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

The problem you are describing is in most cases caused by a failing alternator but before you replace any parts the first thing you need to do is to have the system scanned to retrieve the fault code that should be setting when the battery light comes on. If you can get this done and post back with this I will direct you from there as to the correct repair.

Customer: replied 1 year ago.
Code p1146 already change the alternator
Expert:  Ronnie replied 1 year ago.

The code P1146 indicates you have Low input from the Engine control module (ECM) on the voltage regulator request signal wire, in order to determine what is failing you are going to need to do some testing. I have enclosed the test in the link below. You will need to start your testing at pinpoint test B1.

Customer: replied 1 year ago.
Already do the testing everything looks normal I think the problem it's the ecm in you experience what did you thing and to program another pcm I going to need program the keys the procedure its same as a ford or I need any security codes
Expert:  Ronnie replied 1 year ago.

If you sure it is the ECM you are going to need a dealer scan tool as well as access to there software to do this programming. In most cases this is done by the dealer.

Customer: replied 1 year ago.
With you experience working on jaguars for many years a car with this code usually what is it that's my question I know you not here to check the vehicle but where's the experience them I just see the same procedures as alldata says I mean what's the point
Customer: replied 1 year ago.
thank you appreciate you time
Expert:  Ronnie replied 1 year ago.

The common cause for this code is usually a failed ECM as you suspect providing you dis your testing correctly and the wiring from the ECM to the new alternator check okay . There no need to redo the steps if you have done so already. Thank you as well. Please take a moment to rate my service so I can get credit for my time, the question remains open for follow up even after doing so, all you need to do is return to this question if need be.

Thank you again.