Disconnecting Battery - Fault code issues???

[shortlad]

I have 2003 996tt.

I've been told that if I disconnect the battery that I may get code issues when I re-connect, is this right?

I was thinking of 2 issues, 1 being adding a battery isolate and the other upgrading the stereo system.

Will I have issues?

[monthefish]

shortlad said:

I have 2003 996tt.

I've been told that if I disconnect the battery that I may get code issues when I re-connect, is this right?

I was thinking of 2 issues, 1 being adding a battery isolate and the other upgrading the stereo system.

Will I have issues?

What do you mean by code issues?

Do you mean, will I have to re-enter the radio and Nav codes?

(The answer is: yes, probably)

[Magic919]

Do you have issues?

[chiark]

I've just disconnected the battery in my 2002 996. no issues. I read up first and general concensus was, unless you want to be deafened, you probably want to put the keys in the ignition and turn them before removing the battery, otherwise the alarm will go off.

You will need your radio code, you'll need to reset the clock , and you may need to retrain the windows one touch function. Some people have reported the ABS/PSM light not going off on next startup, but a drive has sorted that out. (Didn't happen for me).

[Rockster]

chiark said:

I've just disconnected the battery in my 2002 996. no issues. I read up first and general concensus was, unless you want to be deafened, you probably want to put the keys in the ignition and turn them before removing the battery, otherwise the alarm will go off.

You will need your radio code, you'll need to reset the clock , and you may need to retrain the windows one touch function. Some people have reported the ABS/PSM light not going off on next startup, but a drive has sorted that out. (Didn't happen for me).

Pretty much my experience after changing the battery in my 03 Turbo except my car does not have the alarm that requires the key be in the ignition and the ignition on. Do not disconnect the battery with the engine running!

No radio code is necessary though earlier models might need this (my 02 Boxster does I know).

I do not think the clock needed to be reset and there were no errors from the steering wheel angle sensor or any other items.

Didn't take me but seconds to swap batteries so the car's electrical system may have had enough capacitance to sustain these circuits during the brief power outage.

The tech told me that had the steering wheel angle sensor error appeared or any other errors associated with battery power loss the errors (warning lights) would go away (go dark) on their own after driving the car.

To the OP: reset the window limits. The steps are in the owners manual.

Also, you need to calibrate the e-Gas system. This might be in the owners manual too.

Generally the steps are: Do not touch the gas pedal during this process. Be sure the key/ignition is off. Turn the key/ignition to on but do not start the engine.

Leave the key/ignition on for 60 seconds. Turn the key/ignition off for at least 10 seconds. Then start the engine. The e-Gas calibration is complete and you can know touch the gas pedal.

Oh just to be safe be sure the gas tank level is above 1/2 tank full.

[shortlad]

Thanks guys.

I was worrying about fault codes coming up after the battery is disconnected and then reconnected. I've heard stories of this and them being hard to fix.

The stereo is being installed by a professional so I'm sure he's aware of what may happen.

[Rockster]

shortlad said:

Thanks guys.

I was worrying about fault codes coming up after the battery is disconnected and then reconnected. I've heard stories of this and them being hard to fix.

The stereo is being installed by a professional so I'm sure he's aware of what may happen.

No direct experience but after I swapped the battery in my 03 Turbo I drove the car over the dealer to have my work inspected and turn in the dead battery for full credit towards the new one the tech told me that had any error codes arisen from the battery change over (loss of power) they would clear when the car was driven. From what I recall of the conversation there was no special driving required just normal driving and not much of that.

The readiness codes can be a bit of a bother, though. The problem is often compounded by the driver thinking he needs to be very aggressive with the car or drive the car at high speed for the readiness tests to complete when it is a relatively mild drive cycle that is quicker at getting the readiness tests to complete.