Porsche 991 Overheating: Auxiliary Pump Failure Alert

Hey there! I had a similar issue with my 2015 Porsche Cayman (I'm a car enthusiast with some experience working on vehicles). The symptoms you're describing sound really familiar to what I experienced last summer. Mine turned out to be a cable connection defective issue that was causing the coolant pump to malfunction. I took it to my trusted Porsche workshop, and they diagnosed it pretty quickly. The fix wasn't too complicated, they had to replace some wiring and secure the connections properly. Cost me about 170€ for the whole job, including labor. It's been running perfectly since then. Before I can provide more specific advice, could you tell me: Are you getting any specific error codes? Does it overheat more during city driving or highway speeds? Have you noticed any coolant leaks? Let me know these details, and I might be able to help further!

Thanks for your detailed response! My mileage is at 106,839 KM and I just had my service done last month. I'm getting error code P2181, and it seems to overheat mostly during city driving, especially in traffic. Haven't spotted any coolant leaks yet, but I'll definitely check out the cable connections you mentioned. That's a much better scenario than having to replace the entire pump! Will get it checked at my local Porsche shop, hopefully it's something as straightforward as what you experienced. Really appreciate the help!

Hey again! Thanks for providing those details. You know what's interesting, my Cayman had the exact same error code (P2181) when I had my issue! The fact that it's happening mostly in city driving and you're not seeing any leaks actually makes me more confident that it could be similar to what I experienced. Since you mentioned you just had service done last month, I'd definitely bring this up with your mechanic. Sometimes these issues can start showing up if any connections were disturbed during routine maintenance. In my case, there was actually a small nick in one of the wires that was causing intermittent problems with the pump's operation. Just to share a bit more from my experience, before I got it fixed, I noticed the overheating was especially bad when I was stuck in traffic with the A/C on. If you're experiencing something similar, that's another sign pointing towards an electrical issue rather than a mechanical pump failure. Quick tip: While you're waiting to get it to the shop, try to avoid heavy city traffic if possible, and maybe temporarily turn off your A/C in stop-and-go situations. That helped me manage the issue until I could get it properly fixed. Keep us posted on what your mechanic finds! Really hoping it's just a wiring issue like mine was.

That's super helpful info, especially about the A/C connection! You're absolutely right, I've noticed it gets worse with the A/C on in traffic. I'll definitely try your tip about turning it off during stop-and-go driving until I can get it to the shop. I've already called my Porsche mechanic and scheduled an appointment for tomorrow morning. The fact that you had the same error code and similar symptoms is really reassuring, fingers crossed it's just a wiring issue! I'll update this thread once I get the diagnosis. Thanks again for sharing your experience, it's really helped narrow down what might be going on with my 991!