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P1621 fault code - but my car has been off the road for 2 months! Please help.

XJ6 & XJ12 Series I, II & III 1968-1992

P1621 fault code - but my car has been off the road for 2 months! Please help.

 
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Old 02-26-2008, 04:38 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

My code list skips P1621.

Your description of symptoms is good. Sounds like something electrical is heating up and cutting out. Does it slowly die out or just cut off dead as though you turned the key off?
 
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Old 02-28-2008, 07:54 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Pam, have youinspected the wires from the ECU for cuts/corrosionas well as the connections themselves? Is the replacement ECU a known good one and an exact replacement?
 
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Old 02-28-2008, 05:45 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

I don't think it's that drastic. The steering locks only when the key is removed. By your description, I would change the entire lock assembly. I'm just guessing, but I would be the lock is bad and breaking all contact. It's telling the car to shut and lock the steering. It would be the only that that combines the two symptoms that I can think of.
 
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Old 03-01-2008, 08:21 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Ken, you probably know better than me, as I'm totally unfamiliar with the car, but kinda sounds like an old time problem of the coil heating up, quitting, and after a short cool down, letting the car start again. Just a thought. Keith.
 
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Old 03-01-2008, 08:27 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Pammyjz, by "The garage guy", are we referring to a qualified Jaguar mechanic? Or just the local grease monkey down at the local garage? Not to knock the local grease monkey, if thats what he is, cause their place in history is well established, but, definately not the place to take your beloved Jaguar. Keith
 
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Old 03-01-2008, 08:30 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Sorry, didn't see the part about the steering locking instantly. Don't think the coil would have anything to do with that. Keith.
 
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Old 03-03-2008, 04:59 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Without the steering condition, go back to Keith's suggestion on ignition coil. Look for signs of leakage on the under side of it. Sounds like Keith is dead on. It hits up and cuts out / cools off and runs again.

As an outside thought (and I mean way outside) check the resistance on the battery cables. The computer feeds directly from the battery since it's more stable. Maybe resistance is building?
 
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Old 03-04-2008, 08:19 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

I agree with checking the ignition module or coil assuming the steering doesn't lock up. Keep us updated Pam
 
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Old 03-05-2008, 08:10 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

OK, a little more info please. You said the steering locked up with you, and doesn't with your husband. How many times did it lock up with you? And did it lock up each and every time the motor died? Just looking for a possible coincidence of some sort, not related to the motor stopping. I hate the idea of throwing money at problems without knowing exactly what it is, but, the cost of a new coil is pretty minor, and would certainly eliminate that possiblility. Keith
 
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Old 03-06-2008, 09:32 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

It's a 96 XJ6. It has no ignition module and six coils.
 
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Old 03-06-2008, 10:03 AM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

6 coils? OK, then I'd reconsider my last post, a little more checking then!
 
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Old 03-06-2008, 02:59 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Correct. Intstead of a distributer with wires, individual coils attach to each plug.
 
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Old 03-08-2008, 01:44 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

Ken, just wondering, going along with my first suggestion. Maybe buy only one new coil, and try it in place of each "old" coil. Still not the best solution, but, short of turning it over to a mechanic, might still be a cheaper way to go.
 
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Old 03-10-2008, 04:50 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

That's exactly how I tell people to replace them when there's a miss. However, one bad coil won't kill the engine. It will run like crap, but won't die.
 
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Old 03-12-2008, 06:13 PM
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Learning something new everyday, thats my motto! Keith
 
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Old 03-12-2008, 08:23 PM
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Default RE: P1621 fault code - but my car has been off the road for 2 months! Please help.

maybe the car is cutting out due to fuel problem.. and she is thinking the steering locks but it doesnt... when engine die's power steering dies as wheel making it give the effect the steering is "locked" simple problem to find..
 

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