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Yikes. Thanks for the reply JFP. I've found some used pumps, but yes seems like hassle if that's what is failed. My understanding is the ABS hydraulic unit is located on the passenger side of the vehicle, near the windshield behind the coolant overflow. Is that accurate? Would a failing ABS hydraulic pump be a cause for loss in brake fluid? Also, I'm going to check the PSM wires under the passenger carpet - what is the best way to pull the carpet back? I'm hoping not to have to cut the carpet.

Ok, another update. Durametric has been working on a fix for the issue connecting to the PSM and they have a path release. I was able to get the fault code, 1276 Hydraulic Pump. Is this referring to the brake booster? I have a brake fluid leak and can smell fluid from the area where the master cylinder/reservoir is, but the brake pedal does not drop to the floor. The fluid leaks only when I use the car, not if it's sitting a while, so I suspect the loss is driven by pressure. There is no visible sign of fluid on the ground or at the calipers. Thoughts?

Ok, couple quick updates - I replaced the Dyanvin with my OEM PCM 2 and it got rid of the gateway, PCM, park assist, and implausible signal faults (1299, 459, 01CB) ABS/PSM Workshop - I'm still getting the ABS and PSM workshop warnings on the instrument panel The Durametric still does not connect to the PSM Durametric has replied to me, acknowledging a known communication problem with 2005-2006 Cayennes, they have no solution yet Faults - left with the KESSY (179, 180, 181), A/C (2193), wipers (1520), and seat memory (1916) Oddly, my KESSY is responding now - I can click the 'unlock' button to lock and unlock the CTT, however the 'lock' button doesn't do anything ... ??? Wipers is the same as above - disconnected rear view mirror because the glue failed Lumbar is the same as above - lumbar works, including up/down and in/out Latest Durametric output attached. Thanks, Sheel short test - OEM PCM.pdf

I'm having a similar problem, see the post for details. My durametric is not connecting to the PSM either. What model and year is your cayenne?

Hello, I've researched the ABS/PSM workshop fault codes and most people say this indicates a failed/failing battery, but my battery appears ok. Attached are my current fault codes; below are details. Appreciate any help or guidance that I can get. Thanks, Sheel Vehicle and diag tools: 2005 Cayenne TT Enthusiast Durametric, Software 6.5.4.8 Fault Codes: Instrument cluster (1299, 429) Not sure why these are being thrown KESSY (179, 180, 181) I can confirm I'm having issues using my keyless entry - car does not respond to key fob clicks Proximity sensors work A/C (2193, 1299) Not sure why these are being thrown My A/C is working as expected Windshield (1520) My rearview mirror has fallen off and is currently disconnected Park Assist (1547, 437, 436, 1545, 1341) not sure why these are being thrown, my park assist appears to be working as expected Seat Memory (1916) I'll have to confirm, but I think my lumbar controls are working on the driver seat Durametric: Cannot connect to the PSM module - communication errors Therefore, I cannot pull fault codes off the PSM I've contact Durametric for support, working with them but not sure if they will come through Battery: NAPA Legend Premium AGM, 2.5 years old I was having battery issues and replaced it in 2/2015 - if I recall properly, I believe I was getting the ABS/PSM workshop faults prior to replacing the battery After replacing the battery I'm still having these fault codes Voltage appears ok - Engine off, ignition/key "ON" position multi-meter at the posts reads ~12.38 durametric reads ~11.8 Engine on multi-meter at the posts reads ~14.13 durametric reads ~14.x Fuses: I've checked #56, #38, #6 on the passenger side and they appear ok I've pulled #40 on the driver's side to reset the cluster Symptoms ABS does not appear to be functioning Unclear if PSM is functioning Air suspension is functioning as expected Head Unit I replaced the stock PCM2 with a Dynavin prior to the battery change I don't believe this unit is causing issues, but I will revert back to OEM to test Brake Fluid Leak I have a leak that I have not been able to track down I believe it's from underneath the fluid reservoir - can smell brake fluid No signs of leaks on the ground or from the calipers Not sure if this would be related to the ABS/PSM workshop issues short test.xps