Gearbox overheat caption.

Hi folks. I’ve recently had a gearbox overheat caption coming on. Even when I’ve just started the car up. Thinking it was the sensor I got a new one. Now the one we thought was broken looked a bit sorry for itself so we replaced it. The colour of the new one was a reddy colour whereas the old one was black. The problem didn’t go away. I’m assuming the other sensor is the Ambient temp. So I’m wondering now if I changed the right one. Which is which, I’ve been all over google and can’t find sod all. Thanx in advance

The sensor can be seen down the side of the gearbox cooler. The plug for the sensor is blue and on leads

Be sure to check your gbox oil level. To be sure. To be sure!

Mark Piercy said:

Be sure to check your gbox oil level. To be sure. To be sure!

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Been on the Guinness Mark?

Henry_b said:

The sensor can be seen down the side of the gearbox cooler. The plug for the sensor is blue and on leads

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Hi mate, can you rewrite your second sentence. It seems a bit garbled. Ta

It looks like these depending on where you buy from. Mounted on NS end of transmission cooler.


or this

blackburnbertie said:

Hi folks. I’ve recently had a gearbox overheat caption coming on. Even when I’ve just started the car up.

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Is your battery in good health...low power on startup flashes up all sorts of error messages

dubbleRR said:

Is your battery in good health...low power on startup flashes up all sorts of error messages

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New battery went in after last weeks mega freeze.

pwood999 said:

It looks like these depending on where you buy from. Mounted on NS end of transmission cooler.


View attachment 227869 or this

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When I ordered a new sensor it was red. The one coming out was black. I believe they’re different part numbers and I’ve been told if you fit the wrong one it won’t work.

Mark Piercy said:

Be sure to check your gbox oil level. To be sure. To be sure!

Click to expand...

The fault flashes up before the key is turned.

The sensor usually goes open circuit when it reaches the predefined "too hot" temp
short the plug on the vehicle side of the loom and the message will go away.

Just looked in RAVE and the 1999 onwards diesel transmission cooler seems to have two sensors. The fan sensor is normally open, and closes when the temp reaches 95deg +/-3. I'm guessing the warning sensor is similar to the V8's which is normally closed, and opens at high temp.

Hence the different colours & part numbers.

Thanx folks for all your replies. Strange thing is it hasn’t done it for a week now.