P1621 Trouble Code
Discussion
Hi,
I bought an engine management diagnostic tool for my 1996 XJR. It has found an error code ‘P1621 – ECM Immobiliser Circuit Malfunction; Out of range voltage for diagnostic line’. If I clear the code, it seems to come back after a couple of weeks.
Any hints as to what might cause this would be greatly appreciated.
Cheers,
I bought an engine management diagnostic tool for my 1996 XJR. It has found an error code ‘P1621 – ECM Immobiliser Circuit Malfunction; Out of range voltage for diagnostic line’. If I clear the code, it seems to come back after a couple of weeks.
Any hints as to what might cause this would be greatly appreciated.
Cheers,
Thanks Ford Prefect.
It is always nice to know that I am not alone in detecting a strange fault.
I have spoken to a Jaguar Service Engineer since posting my question and it appears that this is a common fault code on X300’s around this age. He believed the fault was caused by low battery voltage (generally if the car is unused for several days). My understanding, following this conversation, is that the service staff just clear the code and do not try to investigate it.
Cheers,
It is always nice to know that I am not alone in detecting a strange fault.
I have spoken to a Jaguar Service Engineer since posting my question and it appears that this is a common fault code on X300’s around this age. He believed the fault was caused by low battery voltage (generally if the car is unused for several days). My understanding, following this conversation, is that the service staff just clear the code and do not try to investigate it.
Cheers,
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