2005 Jaguar XJ8 Reduced performance and erratic shifting

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12-18-2021, 12:26 AM

Fbalcazar

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2005 Jaguar XJ8 Reduced performance and erratic shifting

Hello everybody.
I have a 2005 XJ8 working just perfect until I just start the car and the transmission shifting erratic and I have the Reduced performance light
How I can correct this problem?

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12-18-2021, 11:16 AM

clubairth1

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You will get better answers if you post in the section for your car. This is for the later 2009-2019 XJ's.
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12-18-2021, 11:35 AM

NBCat

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@Fbalcazar, two things to check before going any further with a diagnosis:

Battery voltage across the terminals when checked with a voltmeter. There should be a minimum of 12.6 volts available for all modules to communicate along the CAN-BUS.
Fluid level in the gearbox. If it hasn't been serviced, it should have a fluid change and pan/filter replacement every 100,000 km/62,000 miles or five years.

Are there any DTCs stored in the system? If so, post them in the X350/358 forum.

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