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2007 Cayman - CEL, P2402 Code and hard to fill gas tank

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I have a 2007 Cayman base model with 100k miles, with the CEL light on for P2402. I replaced the gas cap as it had quite a lot of cracks in the rubber seal.


The CEL came on shortly afterwards with the following symptoms:


1. P2402: Pump motor final stage tank leak diagnosis module in Durametric.

2. It is hard to fill the gas tank from about 1/2 full onwards without the gas pump clicking off all the time.

3. 'Check engine light' and 'Visit Workshop' messages pop up.


What parts would I need to investigate and where are these located? 

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P2402 - DMTL – Tank Leakage Diagnostics Module, pump output stage


Possible fault causes:
- Open circuit, short circuit to B+ or short circuit to ground of activation line for DMTL pump motor
- Open circuit in the power supply to the DMTL
- DMTL – Tank Leakage Diagnostics Module faulty
- DME control module faulty

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Thanks Loren. Where is the DMTL located?

Will this cause the difficulty in filling the gas tank, as none of my previous Caymans had this issue?

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Is that somewhere in the frunk behind all the plastics and near the gas tank filler? I haven't disassembled the frunk area on a Cayman before, most of my work takes place from underneath.

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Sorry, I cannot find the part number for this unit anywhere, even my dealer parts counter and Pelican Parts doesn't know what a DTML is. Can you assist with that please?


If you know the part number for the tank purge valve as well, I would appreciate it. I may as well change both out to get rid of this error, as I need to smog the car.

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