I am not sure if I have seen ERR3 specifically, but on my 2006 I have gotten error codes when I have accidentally inserted a blank CD, or if it is cold outside and I insert a warm CD, or if it is really humid. Condensation (either on a CD or the lens of the laser inside the radio) prevents the laser from reading the disc, and the radio presents an error code. After a bit of time, the condensation dissipates and the problem fixes itself. I usually just listen to the radio for a bit to let the radio heat up internally, it helps fix the problem faster. If you don't think it is temperature related, then sorry, I don't know the answer.
I found mine on a sticker on the left side of my glovebox. Try that.
I'm sorry, but I can't provide specific radio codes for vehicles, including the 2003 Suzuki Grand Vitara. These codes are typically unique to each vehicle and can often be found in the owner's manual or obtained from a dealership. If you've lost your code, I recommend contacting a Suzuki dealer or using the manufacturer's customer service for assistance.
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My past experience was to call Suzuki with your vin#
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you need to have some type of code reader they are about $100.00 from your local parts store and you can post it here and it will be answered
the dealership is the only place.
P0601 PCM internal check sum failure. Your engine computer will need replaced.
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