If it won't even crank you're looking at a bad (major) power/ground connection or possibly the ignition switch is faulty.

(Others will have more ideas.)

 

 

 

Are you talking about the PCM (Powertrain Control Module), the brain for the engine and transmission? If so, who did the work? A dealer or Jag specialist? This was a NEW module, right? Be aware you can't swap in a used module from another car. Details below, copied from another recent thread:

"Here's the info, straight from Jaguar, via JagRepair.com:


http://www.jagrepair.com/images/Trai...es/870B_SG.pdf


Read pages 1-8 through 1-10. It describes how once the VIN is written into memory, it cannot be overwritten.

The note on page 1-10 is even clearer:

"Once a PCM is configured to a vehicle, it cannot be reconfigured to another vehicle."

The same page also mentions: "The new PCM must be configured to the instrument pack as part of the security system set-up. If this is not carried out, the engine will not start."

End copied text.

Another thought is to check the battery ground connection, where the cable bolts to the body. This is a known problem area. The bolt passes through from the trunk into the wheelwell, and contamination can wick up through the bolt threads, causing an intermittent connection. This connection was probably disturbed when the ground cable was disconnected for the recent repairs, making the intermittent connection worse.

 

Now there's a critical thing you failed to say!!

Why was it done?

 

 

Get a refund! They've done the wrong thing and by the sounds of it caused more trouble as well.

 

 

Did it start after they repaired it?

 

 

Then I'd suspect a loose connection somewhere connected to the ECM change.
Is there an engine light or any codes stored?

 

 

 

What was it? The ECM connector itself?

 

 

Sounds like they charged you for their mistake. The repair to the wiring was the root cause of the problem. That is the actual fix and what you should have been charged for.

They misdiagnosed the problem, threw a computer at the problem and let you pay for it. After you brought the car back and they found the wiring damage, they should have refunded their expensive mistake and charged you only for the wiring repair that it really needed.

Whether you can can get them to refund the difference is the big question...