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Hi all I have a UK spec 2005 3.6 CTS I have a code p0451 coming on I think this points to the fuel tank pressure sensor I have read though many forums which say that it is in the pump unit on top of the fuel tank but have also come across this
http://www.justanswer.com/cadillac/4pg9f-cadillac-cts-2007-caddillac-cts-3-6-codes-p0451.html
Which says its on the side of the evap canister I would be very grateful if someone could confirm which is correct as the cost to drop the tank is quite substantial vs me popping a sensor in the side of the evap canister many thanks for any help
 

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Hi,

I know this thread is a little old, however I would really appreciate any help with this issue too.
Maybe neilste2020 if you are still posting here and you got this fixed please can you could let me know how?

Alternatively, if anyone else can help, that would also be great!
UK based and I have a RHD CTS 3.6 2006 (Manufactured in 2005 I believe). I have this p0451 code.
I did have both the p0453 & the p0451 code, but it seems that the p0453 code has been fixed by using a brand new petrol/gas cap I just received from the US.

Thanks in advance
 

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would probably help if you listed the codes WITH definitions. That could be one reason that the OP didn't get any response. No one has all the thousands of codes memorized.
 

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Hi 1969byrdman,

The definitions for the codes I think are..
P0453 - Evaporative Emissions Control System Pressure Sensor High Input
P0451 - Evaporative Control System Pressure Sensor Range/Performance

There are no issues with performance or the car running, the only indication of an issue is the yellow engine light on the dash. However this light will probably result in a failed MOT which is due in a few months (July).
Perhaps someone can suggest a fix or work around, as finding it impossible to locate a mechanic/garage locally (Devon, South West UK), that is confident to work on it.

Maybe there is someone nearby that will see this post, hope so. :)
 

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I have an 05 that had P0451 code and replacing the sensor cured the problem. The sensor can be in either place. My factory service manual says that it is on top of the tank. Mine is on the evap canister.
 
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