2005 Jaguar X-type p1796, p1797 fault codes - check engine light is on

P1797 = Neutral Switch Circuit Malfunction.
I am assuming yours is an automatic. On Automatics there is a switch on the transmission that can override the ignition to prevent the vehicle starting if it is in gear. This code is showing a fault in either the wiring to the switch or the switch itself.
This is one of those jobs which depends on where the switch is fitted. On some Jags it is fitted (hidden) underneath the battery box so it's not too bad to get to. However, some are mounted on the transmission housing in a typically silly location and it becomes a much bigger job. Personally I would suffer the pain of paying and getting a good mechanic to do it as they will have all the tools to deal with it quickly.

p1396 is a engine managment code. variable valve timing solenoid b malfunction, not a gearbox code. you really need to take your car to someone with access to suitable diagnostic equipment to help sort this problem out, hope this helps,

the problem is in the electronics of the transmission
from your statements , it indicates that the TR sensor is not working properly and the transmission has problems selection the correct ratios
the engine light reports on both engine and transmission faults
first get the fault codes then fic/replace the items causing the codes

My jaguar gearbox light has came up some one help please

You have a fault condition in the the engine management system - get the codes read to indicate where the fault lies ... It is probably just a faulty sensor as this is the most common cause of check engine warnings. The restricted performance condition is meant to protect the engine or components from damage, so don't panic - get the codes read - its probably not as bad as you expect. hope this helps - good luck.

try disconnecting the battery and joining the leads together leave for half hour and try again ,Seems to be common fault on these cars with teh computer and i have no idea whats causing it to do this but i do know that joining the leads together clears the fault sometimes

sorry but none of these codes appear in teh jaguar code list but in the generic code list which i have just checked they dont exist either so contact the code reader manufacturer

The engine light shows a fault has occurred. The recorded fault will be visible if you have the codes read. One of the most common faults is the MAF (mass air flow sensor) this sometimes shows a wrong reading and logs as a fault, The light may go back out after the engine has completed another self check - if there is no ongoing fault. Get the codes read to be sure. .............. hope this helps

My records show that P1796 Fault indicates a Kick Down Switch Circuit Malfunction, however there appears to be some discrepency here as other records show it as a CAN bus (off) fault. A quick check to see if your car will go into kickdown should identify which is which. Clear the fault then drive gently for 20-30 miles, if no engine light then use the kickdown and see if it comes on. You can check out other fault codes at http://www.bluejag.co.uk.