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Discussion Starter #1
I wonder if anyone can help with an issue I'm having with my 2004 L322 Vogue 4.4 V8. 124k miles

I have searched the forum and found lots of threads about the trans failsafe prog, all with slightly different issues. Can anyone help with mine specifically?

I seem to have an intermittent gearbox issue.

- Sometimes it's completely fine and works as it should.

- Sometimes it works without displaying any error messages but seems to occasionally do a jerky gear change with a clunking noise, particularly when moving off from stationary or something strange like when accelerating and it should kickdown, it changes up instead of down and jerks.

- Sometimes when putting in manual mode, it refuses to change when you tell it to and simply flashes the gear you are trying to select then goes back to what it was in before, and doesn't change gear

- I have had the trans failsafe error come up a couple of times, and it go into crawl mode. The first time was when I had the car in sport mode. Second time, it was in auto and I was pulling off from a roundabout, accompanied by a clunking noise

- I have also had one occasion where the engine management light came on along with the trans failsafe error

Any suggestions on the likely cause?

- Check trans fluid?
- Get proper trans fault codes read by dealer?
- Transfer box?
- Gearbox failure?

Thanks in advance
James
 

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LEGACY VENDOR
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2,369 Posts
Hi James, and welcome to the forum.

Intermittent issues are always a pain to try to diagnose remotely but I guess we could say :

1. The issue is unlikely to be mechanical (shafts, gears, clutches, etc.) because your transmission sometimes operates correctly (though it could be hydraulic)
2. Reluctance/refusal to upshift is often a sign that the transmission fluid is overheating
3. Transmission failsafe mode is more serious, as it implies that the controller has detected clutch slip. However it’s worth pointing out that the most common reason for this error to be flagged is unconnected with the transmission and is caused by low battery/charging voltage or a fault with the transfer box shift motor potentiometer.

I would suggest that your next step should be to get the fault codes read, using a proper piece of diagnostics kit which can read the Land Rover specific P-codes and not just generic OBD codes. This should at least tell us why failsafe has been activated.

Phil
 

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Discussion Starter #3
Hi Phil,

Thanks for the reply.

I have already ruled out the battery as I tested it and it was 14.5V at tickover and 12.7V with the engine off.

Perhaps the next thing to check would be the transmission fluid then, and get the fault codes read. I only have a basic OBD reader, it's picked up 2 codes, one for o2 sensor and one for lambda, which I'm guessing is unrelated to the transmission problem.
 

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LEGACY VENDOR
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Sounds like a plan. Unfortunately a basic OBD reader won’t be able to identify specific transmission fault codes so you need to find somewhere with an Autologic or, better still, Testbook/T4 system. If you’re likely to be keeping your L322 for a while I would seriously consider getting your own diagnostics kit (loads of information on here).

If you check the fluid level you need to make sure that you follow the correct procedure as the transmission is very fussy.



Never remove the filler/level plug unless the engine is running or you will end up with over a litre of fluid down your arm.



and only ever use Mobil ATF LT71141 fluid for topping up your 5HP24.



Phil
 
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