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Hi, I have a 2008 Porsche Cayenne with a a CEL for P2404. The car runs completely normal and this is the only check engine light code. The only information I found on this is:

 

P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance

Possible cause of fault - Insufficient vacuum (system has a leak or blockage) - Short circuit to B+ in signal line - Leakage diagnosis pump faulty (diaphragm or reed switch sticks, internal solenoid valve stays closed or is blocked) -DME control module faulty

 

I was wondering if there was anyone with a similar issue or anyone with knowledge of a reported fix. If not, I'm a pretty good DIYer. Does anyone know how I should go about diagnosing this?

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:welcome:

 

P2404 Leakage diagnosis pump, Reed switch

 

Possible fault causes:
- Vacuum system leaking (The system consists of the mechanical vacuum pump (on the vehicle engine), the leakage diagnosis pump, the intake pipe switch-over valve and, where appropriate, the exhaust flaps in the rear muffler)
- Vacuum pump has mechanical fault
- Tank vent valve stuck in closed position
- Purge-air line between tank vent valve and carbon canister blocked
- Short circuit to B+/ground or open circuit in signal line

 

- Leakage diagnosis pump faulty

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Hi, I have a 2008 Porsche Cayenne with a a CEL for P2404. The car runs completely normal and this is the only check engine light code. The only information I found on this is:

P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range/Performance

Possible cause of fault - Insufficient vacuum (system has a leak or blockage) - Short circuit to B+ in signal line - Leakage diagnosis pump faulty (diaphragm or reed switch sticks, internal solenoid valve stays closed or is blocked) -DME control module faulty

I was wondering if there was anyone with a similar issue or anyone with knowledge of a reported fix. If not, I'm a pretty good DIYer. Does anyone know how I should go about diagnosing this?

I've seen this a few times. 1st I'd say if you have a vac. gauge get that on your vac pump on the back of B1 cyl head. Look for low vac./oil ingress from pump seals. Another easy test would be if you have ability to run a short test. Remove r/r wheel & inner liner gain access to carbon canister vacuum feed line place a vacuum bleeder on the canister and run your short test. If you pass it's a vac supply issue if you fail it's a carbon canister/electrical issue. My gut is bad vacuum pump

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