Multiple fault codes! Please help

Hello everyone. I have a 2006 Cayman S - stock except for a performance exhaust . I was caught in a snowstorm the other day and the ABS and PSM was working overtime. Suddenly it failed and I got ABS and PASM failure warning lights. After a re-start I had spoiler failure, visit engine workshop, PASM failure. Additionally, sport mode doesn't work, speedometer doesn't work, spoiler won't go down. Crazy. Bought a Durametric and got a ton of codes, but couldn't really clear any of them. Not sure what the issue is? ECU or DME failure? I'll list the codes and hopefully someone can give me a point in the right direction. Bosch DME 7.8.1 U0129 Unknon fault code P0564 Cruise control operating lever P0503 Vehicle speed signal PASM C152 Communication PSM control unit (drive) 0010 Button LED TPM C152 Communication PSM control unit (drive) Vehicle Electrical System C152 C2002 Fault PSM control Unit (display) Advanced weight system C152 Steering column electronics C152 A/C 8001 Terminal 30 voltage supply C152 PAS C202 C152 Front body module C152 C202 Rear body module C152 Left Door Module C152 C202 Right door module C152 C202 Seat Memory C152 Sports Chronometer C140 Communication instrument cluster (display) C152 9102 Chronometer faulty

That's a lot of stuff to go wrong at the same time. Since PASM and PSM were working overtime, check a fuse. This might be a simple fix.

Yes, I agree with the previous post: a fuse, a power connection, a ground, a bad connector...

I looked at the PSM fuses, but they were fine. Should I pull and check every one?

I would suggest determining when the battery was if ever replaced and if it hasn't been replaced I would start with that. The next most common element would be the ECU . Best of luck.

I am not sure if the battery has ever been replaced. I tested the voltage (car off) and it was 11.8v. I put it on a charger overnight and the problems still persisted, but it still could be a battery problem I guess. Maybe worth replacing before bringing it into a shop?

I believe U0129 = Lost Communication with Brake System Control Module. I agree with the other posts to start with the basics. Check the connections to the battery. Are they clean and tight? Then check all fuses. Then maybe look for likely places where you could have wire damage. Let’s see, you were driving in a bunch of snow. Maybe some snow or ice caused damage to a wire on the underside. Maybe something at one of the calipers, like speed sensor or wear sensor wiring? From a quick scan of the 987.1 wiring diagram, looks like those wires all hook to the PSM control unit. Just one idea of a possible place to start looking. Best regards, Curt

Thanks Curt, I'll give a look under the car tomorrow. Guy

You may also want to check your wheel speed sensors.

11.8 volts is a dead (0% charge) battery . Don't waste time charging it. Replace it.

Disconnect the battery for 10 min. Then reconnect.

Ok, no loose wires around the brakes/ speed sensors. No blown fuses. Disconnected battery for 30 min. No change. Going to auto parts store now for new battery . Stay tuned....

New battery . Same problems.... Any other ideas?

To be honest, at this point, it is probably in your best interest to take it to a shop.

The new battery could be bad or there can be a problem with the alternator that prevents it from supplying the necessary power to run the vehicle. The battery is just there to start the engine. The above are just possibilities and admittedly probably not the case in this instance. A check of the power at the battery terminals with the engine off, key off, then with the engine on, key on, engine on and running at idle can spot a possible battery or alternator problem that might be compounded by a larger than normal parasitic load. The above requires you have the proper equipment (you have to measure voltage and amps) and know how to use the equipment. The other possibility is that somehow water got where it shouldn't have. Check the usual places: the carpets on the floor, especially under the seats, the passenger seat where the security system is located. Be sure all the body water drains are free of any trash build up. Check the doors for any signs of water ingress. Give each one a shake and listen for sounds of water inside. Feel the bottom of the doors for any dampness. However, the symptoms are not the usual ones when water is in the cabin or the doors, thus you have to suspect water managed to get into/onto the DME (engine controller). (The varied symptoms can also be a sign mice have been at the car, the wiring (at least).) I'm not even sure where the DME / ECU is located in the Cayman . (In the Boxster it is located on the front bulkhead of the rear trunk under/behind the carpeting.) But really I agree with the opinion offered by bin31z: time to get the car to a shop. You've done about all you can do. With the old battery voltage at 11.8v that's reason enough to replace the battery but if that doesn't make the symptoms go away there are two (or more) problems. The battery was just one, and it may have been done in by the other problem. So you don't want to delay as whatever else is going on besides rendering the car really unusable could ruin the new battery too.

Thanks. I'm bringing it in SSI in Baltimore tomorrow. One thing of note.... I've been noticing a wiper fluid low alert for a few weeks now. I filled the reservoir but noted the alert again a few days later. Maybe there's a leak in the tank shorting out electronics???

Sounds like a good idea. That's a wild combination of fault codes. Hope it turns out to be a simple thing to fix (read inexpensive!). Please share the result. Cheers, ...and GO SEAHAWKS!!! :banana:

I had 5 fault codes at one time. This occurred after I installed my smart top and I didn't fully connect a wiring harness after the install. The fault codes were seemingly unrelated. I don't know if you touched or potentially jiggled a wiring harness but something else to consider.

Hey, or a bad ground could do the same thing, right? Disable a seemingly unrelated set of functions (common mode failure). And then on top of that, couldn't some of those faults be 'left overs' from previous issues that may not have all been cleared when the problem was fixed? Of course, I could be over thinking this! Cheers,

Well the problems have been solved. I want to thank everyone for their advice. Let me tell you what happened.... Firstly- My battery was probably dying. Then, when I got caught out in the snow, I overheated my ABS pump and caused the ABS and PSM faults. I was unable to clear the codes. I then checked every fuse (but stupidly replaced the PSM fuse in the wrong blank socket). Then I bought a new battery , however the fuse was not in the correct socket and I didn't know it, so I couldn't clear the faults. The good folks at SSI quickly realized I had the PSM fuse in the wrong slot. The were then able to clear the codes. They did say they had to reprogram the PSM gateway with their computer- so I likely couldn't have solved the problem even if the fuse was in the correct slot- and I used my Durametric. Anyway, I got off cheaply and the car is back to normal. I think the lessons learned are to be proactive about battery replacement and to turn the PSM off when driving in snow so as not to overheat the ABS pump. Thanks again Guy

Glad to hear all is fixed up. Sounds like it may not have been too expensive. I'm interested in why they had to reprogram the PSM gateway, or more fundamentally what that really means. But if you don't have that detail - no worries. Cheers,

I asked the same question about gateway reprograming. They only said that it required re-programing using the Porsche computer system they had at the shop. They only charged me an hour of labor/ diagnostics. Got off easy

Hello, I have been reading this and other forums for the las year or so since I purchased my 2008 Cayman S . I have found lots of good information and technical help. I don't post much, but I need some help with this. I thought I would use an old related thread rather than starting a new one. Moderator, let me know if I make some unintended mistakes in posting. So, here is my situation... My airbag light came on about 8 weeks ago. I bought a Durametric (enthusiast) cable and read the codes. There are several. Many concerning the air-conditioning system. I think I attached the latest list of error codes from the Durametric software. If not I will find a way to post them directly. After reading these codes and checking every connection I could access behind the A/C and PSM control units I noticed that the defrost flap motor seems to be getting a constant pulse every second or so. I replaced that part with a new one and no change. I have disconnected the battery over night and just about every other thing I can think of or have read about. I also removed the passenger's seat and checked and cleaned each of the plugs under there. (BTW - I suggest removing your seats just for the ability to clean them and the carpet really well.) I took it to the local European Indy mechanic. He brought out his code reading system and essentially tried several of the things I did. After about 3 hours of general trouble shooting and phone calls to some off site source, he gave up. He charged me $115 and I went home. Yeah - I didn't like paying for someone to look around and not fix anything. But, I figured that I didn't want to ruin my relationship with him for just a few bucks. Plus, he spent a lot of his time and energy not making money from other customers. I took the dash apart again and cleaned and checked every connection again. Erased all the codes. Same thing. I read in the post above, something about reprogramming the PSM gateway. What is this? Can I do it? Can my Indy do this? Should my Indy have done this? I am going to make an appointment with the Porsche dealership soon if I can't figure this out. I am worried about how much their fees might be , but if I can't do this myself then I really have no choice.

I believe I may have a similar issue. I have multiple fault codes from the Airbag system and the A/C system. Can this PSM gateway be reset only by the Porsche PIWIS ? Work Log Short Test Bosch Digital Motor Electronics Motronic 7.8.1 No Faults Found Porsche Stability Management - PSM No Faults Found Porsche Active Suspension Management - PASM Tire Pressure Monitor - TPM No Faults Found Instrument cluster - 9x7 No Faults Found Vehicle Electrical System No Faults Found Airbag - POSIP Current Fault Codes C141: Communication PCM (display) Advanced Weight System - AWS Current Fault Codes C152: Communication PSM control unit (drive) C153: Communication steering wheel electronics control unit (drive) C128: Communication PAS (comfort) control unit Steering Column Electronics No Faults Found Air Conditioning Current Fault Codes 8035: Interior sensor fan C141: Communication PCM (display) C135: Unkown fault code, please tell us about this missing information by clicking here C131: Communication gateway control unit (CAN comfort) C124: Communication convertible top control unit (comfort) Cornering Lights Gateway Current Fault Codes C144: Communication CDR (display) Porsche Access System - PAS No Faults Found Front Body Module Current Fault Codes 8021: Front luggage compartment light Rear Body Module No Faults Found Left Door Module No Faults Found Right Door Module No Faults Found Park Assist Seat Memory Sports Chronometer Short Test Bosch Digital Motor Electronics Motronic 7.8.1 No Faults Found Porsche Stability Management - PSM No Faults Found Porsche Active Suspension Management - PASM Tire Pressure Monitor - TPM No Faults Found Instrument cluster - 9x7 No Faults Found Vehicle Electrical System No Faults Found Airbag - POSIP Current Fault Codes C141: Communication PCM (display) Advanced Weight System - AWS Current Fault Codes C152: Communication PSM control unit (drive) C153: Communication steering wheel electronics control unit (drive) C128: Communication PAS (comfort) control unit Steering Column Electronics No Faults Found Air Conditioning Current Fault Codes 8035: Interior sensor fan C141: Communication PCM (display) C135: Unkown fault code, please tell us about this missing information by clicking here C131: Communication gateway control unit (CAN comfort) C124: Communication convertible top control unit (comfort) Cornering Lights Gateway No Faults Found Porsche Access System - PAS No Faults Found Front Body Module Current Fault Codes 8021: Front luggage compartment light Rear Body Module No Faults Found Left Door Module No Faults Found Right Door Module No Faults Found Park Assist Seat Memory Sports Chronometer Any thoughts about where to go from here?

Hello Everyone, sounds good replacing the Battery for Porsche, but also you have to recognize it with the system and reset the battery voltage by brand name, factory code , etc. when changing battery in Porsche you need to reset the battery. then you may solve the voltage issue first. with best wishes Someone

how you fix it? I had the same problem now