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2006-2009 Range Rover MkIII / L322
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5 Posts
Discussion Starter #1
My 08 RR HSE with 90k miles is giving me a transmission overheat message along with select neutral and then it automatically goes into sport mode. The RR doesn't leak anything and had it hooked up while driving to check temps. Everything is running as it should and all temps are normal as well as shifting normal. My only guess would be a transmission temp sensor. But where would that be? I have already shelled out $$$ at two garages and both couldn't help.
 

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2006-2009 Range Rover MkIII / L322
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5 Posts
Discussion Starter #3
Thanks for the reply RRPhil! So that's what would be causing the transmission overheat message then? Another person mentioned the transfer motor box but that didn't sound right to me. I get the message on start up even when it has set for a couple days and it stays on. I only drive it about 3 miles a day and the weather has been in the 20's and 30's. Do the 06-09 RR's have the same issues as the older ones with the radiator/oil cooler needing replaced?
 

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LEGACY VENDOR
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2,290 Posts
I suppose a faulty temperature sensor is the obvious conclusion, but it isn’t a common fault. Unlike on the 5-speed models there’s no external wiring or connectors between the sensor and the ECU which could also cause issues. The 6-speed has the ‘tracks’ built directly into the electronic module, so I can only guess that the sensor itself has a fault.



The electronic module is coded to the vehicle so, unless you can get your existing one fixed, a replacement would require re-coding.

The radiator and oil cooler issues were on the early 5-speed L322s.

When you say that you “had it hooked up while driving to check temps” do you mean monitoring the fluid temperature via diagnostics (using the transmission’s sensor) or by some independent method?

A possible reason the fluid might overheat is because the torque converter lock-up clutch isn’t functioning correctly but that certainly wouldn’t cause the message to be displayed on start up when cold.

Can you get the codes read in case there’s some other electrical/electronic issue (battery voltage, etc.)?

Phil
 

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2006-2009 Range Rover MkIII / L322
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5 Posts
Discussion Starter #6
I had the 2nd garage hook up diagnostics while driving it and as it sat idle for about 45 mins and they said they transmission temps were normal. But it is like the "transmission overheat" followed by "select neutral" and "sport mode" are always on. There isn't any banging grinding slipping or anything like that. Honestly the car drives as normal as the day I got it. I just keep getting the messages and the (bongs). All my gauges are normal the vehicle doesn't leak anything. I am going to try an indy shop to see what I can come up with. They say third times is a charm. I have read where it could be the battery and my battery is about 4 to 5 years old, but nothing other than the three messages i get has been out of the ordinary.
 

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2006-2009 Range Rover MkIII / L322
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5 Posts
Discussion Starter #7
Well third time was a charm. Turned out it was a battery that was going out that has been causing all the messages to display faults. Bought a new battery and installed and wouldn't you know. Everything is working like the day I bought her. Kind of mad that I went to two previous shops that charged me to look at it and came up with way different causes. But I can't be too mad because I am happy that it is nothing major. Thanks for the help RRPhil, this forum is great!
 
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