mattsrs

​​​​​​Wow so it is not e-hybrid specific issue

Maddie288

Wanted to add to the string here. I took delivery of my 2021 Cayenne Coupe on April 24. In June, I got my first CEL. The dealer was able to reset it and then it happened again within 24 hours. My dealer ordered a new LiIon battery thinking that would solve the problem. I waited a month for the battery and then after a week in the shop I was told basically the same thing you list below. The battery wasn't the issue. This instead is a known issue. Software based. Car is safe to drive. The frustration is driving a brand new Porsche and your CEL is on like its a 2000 Buick! There is no ETA on the fix. Are you aware if we have any recourse with Porsche?

daveo4porsche

Hybrid? or non-Hybrid?

luvawatch

I finally am taking my e-hybrid back to the dealer next week. This is the 3rd time my CEL has come on. My sense is the car is safe to drive but I do want the dealer to have a record of it just in case....will share results. How long did your dealer keep you Cayenne for?

daveo4porsche

well while working with Porsche NA/Technical support it was in the shop for over 90 days on 3 separate visits (90 days total) - since there is NO FIX dealership service held the vehicle in limbo without doing anything to it while they waited for Porsche Technical support to offer up a fix.

until there is a fix the vehicle could be held indefinitely if you don’t want the car back without a fix.

for my situation and my particular CEL code I’ve been told it needs to be fixed in software - it’s related to charging the vehicle - charging the vehicle will make it occur more frequently - but it can also occur without charging (I’ve now had it happen with NO charging - but it self cleared after being turned off for more than 20 minutes)

to my knowledge for my problem there is NO fix known at this time - so if you are demanding the vehicle not be returned to you until this is resolved - that means you will not receive the vehicle back anytime soon - YMMV

I’ve been told: this is fleet wide, it’s a known issue to porsche if you get to the right people, it would have to be fixed in software, and porsche is unwilling to disclose the following to me in writing:

1. they are actively working on a software fix - no confirmation from porsche in writing when asked
2. ETA for the software fix they are not working on from #1 - no proposed schedule from porsche in writing when asked

I was given the option of driving the car if I wanted and I would ignore the CEL since further diagnosis was un-necessary at this time as there is no resolution to this issue at this time.

NOTE; legally me driving the car does not change it’s lemon status - and does not change the residual value calculation from the time of the first occurrence - so based on my simplistic non-legal analysis - driving the vehicle with this fault is consequence free and doesn’t change it’s “lemon” status.

California Lemon law stipulates the following:

1. vehicle out of service for any reason for more than 30 days is a lemon
2. vehicle attempted service more than 3 times for the same issue is a lemon

at the moment it appears to me that Porsche is shipping a product with a known defect that will for the most part automatically “trigger” Ca. lemon law - because of the current software and behavior for all versions manufactured/delivered to date. If you want to push it Porsche will have to buy your car back because they have no fix “in the field” at this time.

for my personal situation I’ve reached De’taunt with the situation and consider this situation un-tenable for Porsche and believe (but have not be told in writing) they are working on a fix - and they can’t really go that long iwth no fix - so for now…

• I’m driving the car
• if a CEL pop’s
  • I’ll diagnose it with my own OBDII reader
  • if it’s the same code we all know and love, I’ll note to my service advisor via eMail and clear it.
  • if it’s a “new” code we’ve never seen before I’ll bring it in
• in the mean time I’m confident the code can be ignored and it’s just over-zelous software that is reporting a “fault” that is for the most part meaningless
• I’m fairly confident it’s not even really a fault - but rather a race condition as all the computers are booting up and computer “g” has a brief moment where it can’t talk to computer “h” and throws a communication fault that is almost cleared as soon as the CEL light illuminates

as to what anyone should do for their personal situation I can’t advise you. However at this time I’m fairlly confident this can occur on 100% of the hybrid’s produced to-date, there is no fix, and the occurrence is basically random, and it’s not a safety or performance issue and the car is safe to drive. As to what you can or can not negotiate with Porsche regarding this situation well that’s between you your dealer and porsche. But you have all the necessary factors to get the vehicle bought back by Porsche as a lemon if you wish to no longer own the vehicle…

in my case please advise what you’d buy instead that is as good as a Cayenne TurboS eHybrid if you get your money back - in my case nothing else honestly compared and everything else is a significant downgrade vs. the Cayenne…

Maddie288

Hybrid.... with the 7.2kw charger

Maddie288

What type of OBDII reader did you purchase, I'd like to get one so I can read the fault at home as well. Thanks. Your posts have been most helpful for those of us experiencing the same issue.

daveo4porsche

for now this one - but it’s kinda hacky and doesn’t specifically “speak” porsche - but it shows the raw “code” number and therefore works well enough to tell if I’m seeing the same code or a new and different code.

Disclaimer: I haven’t used it extensively and will NOT take responsibility if your personal use of this product damaged your brand new Cayenne - if you are even slightly concerned about this product please do not self diagnose but take your vehicle to your authorized porsche service center.

https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1

luvawatch

Thank you very much for this...really appreciate it. I'll probably leave my car there until there's a fix. Since I'm in CA, if there's no fix then I'll just pursue the lemon law and move on to something else.

donutcritic

Dealer claims to have resolved the CEL issue on my MY21 TSEH related to charging by replacing the onboard high-voltage charger + software update. Initially they blamed my 110V circuit (its a rental) using Porsche's Battery Charger as the root cause. Their notes are below, I guess we'll see how it goes!

835 CHECK ENGINE LIGHT. VERIFIED THE CHECK ENGINE LIGHT IS ON.
PERFORMED A VAL ON THE VEHICLE AND CHECKED THE STORED FAULT MEMORY.
FOUND THE CHECK ENGINE LIGHT IS ACTIVATED BECAUSE OF FAULTS STORED IN
THE HIGH VOLTAGE CHARGER. FAULTS IN THE CHARGER MATCH TI#2797.
PERFORMED THE SOFTWARE UPDATE/PROGRAMMING OUTLINED IN TI, 279725
Complaint ? Charging is Canceled / Check Engine Warning Light is
Active: Re-Program High-Voltage Charger (OBC) Control Unit (36/21).
HOWEVER AFTER PROGRAMMED THE FAULTS DID NOT CLEAR. CONNECTED A HV
CHARGER TO THE VEHICLE TO CHECK IF THE VEHICLE CHARGES PROPERLY, YES IT
DOES. DISCONNECTED THE 12V BATTERY TO PERFORM A TERMINAL 30 RESET OVER
THE WEEKEND. CHECKED/CLEARED THE VEHICLE FAULT MEMORY. FAULTS IN THE ON
BOARD CHARGER STILL PRESET. CONNECTED A HV CHARGER AGAIN AND VERIFIED
THE VEHICLE DOES CHARGE PROPERLY, EVEN THOUGH A SYMPTOM OF THE FAULT IS
THE CHECK ENGINE LIGHT DID RETURN
AFTER CHARGING, SAME FAULTS. PERFORMED ANOTHER VAL ON THE VEHICLE,
ACCORDING TO THE BULLETIN THIS IS KNOWN ISSUE, WILL CONTACT PORSCHE FOR
ASSISTANCE/REPAIR INFORMATION. ORDERED A NEW HIGH VOLTAGE CHARGER FOR
THE VEHICLE. ISOLATED THE HIGH VOLTAGE SYSTEM USING THE SYSTEM TESTER.
DRAINED THE LOW TEMPERATURE COOLING SYSTEM. REMOVED AND REPLACED THE
HIGH VOLTAGE CHARGER AS OUTLINED IN THE WORKSHOP MANUAL. FILLED/BLED
THE LOW TEMPERATURE COOLING SYSTEM. POWERED UP THE HIGH VOLTAGE SYSTEM.
CHECKED/CLEARED THE VEHICLE FAULT MEMORY AFTER PERFORMED THE NEEDED
CODING/PROGRAMMING ON THE NEW HIGH VOLTAGE CONTROL UNIT. CONNECTED A
CHARGER TO THE VEHICLE AND VERIFIED THE CHARGER IS WORKING PROPERLY.
CHECKED THE FAULTS AFTER CHARGING THE VEHICLE OVERNIGHT. DONE//

luvawatch

Thanks for the update and good luck. Mine's going to the dealership tomorrow.

daveo4porsche

on the surface this does not appear to be the same CEL as I’m experiencing - in my case the following is true:

1. it’s not a High voltage system fault
2. it’s not repeatable when charging
3. replacing the HV charger on the vehicle did not resolve the issue
4. my service tech says there is no current software update for my issue.

I hope this resolves your issue.

mattsrs

Wow what a clusterf*** Porsche created with CEL. It happens on hybrid,non hybrid and With different codes and nobody knows the cause

cl0r0x70

New 2021 Turbo Sport E-Hybrid. CEL comes on seemingly at random, but almost always at engine start up.

Had into the shop twice. They noted some "communication errors."

Has the 7.2 kW charger running through our professionally-installed 220V Porsche charger mounted in garage.

Light will come on whether we've been charging it or not.

Does not interfere with driving.

luvawatch

This is my same situation. I also have the 7.2 charger. Took it to the dealer today. How long are we willing to wait for the fix??? I'd hate to drive around is a practically new ride with the check engine light on...