Misel982001

Hello guys, I am new here. I have owned a CAYENNE 955 2003 model, and everything was fine. While on quarantine , I did not use my car much, so my battery went dead. When I restarted the car, 4 months later there was a currently unsolvable issue. When I go faster than 110 -130 kmh a red lamp begins to flash where the reduction on/off stick is and if I continue accelerating the gearbox goes on neutral. The screen shows the message " 4 wheel drive faulty" and then PSM OFF. This happens usually but not always. If I deactivate the PSM nothing happens, however I do not like this car without the PSM and generally I am very dissatisfied with this. I went to my dealer and he sprayed something in the transfer case. This fixed the problem for a couple of days. Can someone help me plz?

Jeff928S4

I used to get the FWD Faulty and PSM warnings when my battery was dying (dead cell, would not hold proper charge). New battery solved the issue.

Misel982001

Hello, thank you for your reply. How do I know that it is not indeed a 4 wheel drive fault?

iadr

Simply odds, statistics. You'll find the advice you are being given here on a dozen different forums. It's solid advice. I'd spend my money based on it.

From personal experience, here in Canada whenever it gets bitterly cold, I get that message. Never in summer. Never repaired a thing. The difference? battery voltage.

Jeff928S4

Getting the FWD fault is one thing, but when it's coupled with the PSM warning, in my experience, it's a low battery.

Every Cayenne owner who doesn't do long drives/lives in a cold climate should invest in a battery charger/maintainer.

Jeff928S4

Same here - Canada's winter + low battery = PSM/FWD faults (and sometimes a headlight won't turn on lol).

barrios35

I had the same issue, needed a new battery. Charge up the battery and see if it goes away.

Once the voltage goes down on these cars all sorts of things happen.

Misel982001

Ok guys, listen I have noticed some important details. 1) When I turn on the lights, the right light does not move like the left one. Their beam is not stable. They appear sometimes bright and sometimes dimmer. 2) When I turn on the lights, the RPM indicator is not stable at 1000RPM. It goes from 700RPM to 1000RPM and then again at 700. 3) When I turn on the lights, the red light indicator of low range (REDUCTION OFF) is usually flashing, like trying to be activated. If I persist , the gearbox goes on neutral.This might happen at 15mph but also at higher speeds. I have not yet found a solution and I REALLY REALLY desperately need your help. PLZ any ideas, whatever plz tell me.

Jfrahm

What is the battery voltage, running and with the key off? Also please tell us where you measured the voltage.

Misel982001

Hello Sir. The indicator on the right says 14 out of a maximum 16. I have no other way to measure the voltage. the battery is brand new. As I mentioned before, I had not moved my cayenne for 4 months. When I drove it in May, I immediately changed the battery. Please tell me what to do. Have you ever encountered this problem before?

iadr

The gauge on the dashboard is useless. That's never how you check. That gauge is entirely irrelevant here (and for anything, really)

All dealers and 75-90% of independent repair facilities have some type of load tester for batteries. You are going to have to have to pay.
But for what you pay- certainly so if you go to a premiumcar/Euro car facility, you could buy a "Battery tender". I'd spend your money that way. If you park a car for 4 months then there is no way you should be without one, period.

You ask if other have experienced this. Certainly in a cold climate and as the cars have reached past 10y old, I'd say over half of owners would have experienced this.
However before anyone says that exaggeratedI admit my experience and database is distorted by living in a climate that experiences extreme cold winters (-40-44*C).

Misel982001

Thank you very much sir. I am going to the dealer and let u know. Thank you very very much

iadr

That was NOT the advice I gave you.

It's an extremely risky path. It only holds promise if you ask for the battery to checked. If you ask for whole car diagnosis, expect to be "taken to the cleaners". Not one in 15 dealership employees is capable of proper diagnosis in this instance, or is allowed to by delaership management.
You need a battery tender, period. You asked for advice and seem to ignore it.

Jfrahm

I suggest getting a meter to check the battery yourself. Take note of where you check voltage, if the dome lights, etc. are on or not and also check with the engine running and engine off.
I suggest checking at the jump post under the hood with the other doors closed and the interior lighting off.

A meter to plug into the accessory socket might also be useful so you can see what your voltage is like when you are having this problem. Very cheap from ebay or amazon.

A dealer will probably take a lot of your money, maybe give you as satisfactory a result as you got with the transfer case spray.

Misel982001

Dear Sir
I do not ignore it. The guy who is the dealer is a good friend of mine and he has helped me in its maintenance. I will tell him exactly what you said.