The Bolton-born comedian revealed the shock decision on BBC Radio Manchester yesterday after ringing up spontaneously for a chat.
And today, Peter rang the same station again and told presenter Becky Want that he had not anticipated the overwhelming reaction from viewers demanding more series.
“I am sorry I have upset people,” he said. “Sian [Gibson] put her phone on and had about 50 messages. She said, ‘What have you said, my phone’s gone mental?’
“I just mentioned that that we weren’t doing another one. That’s just the truth. I didn’t mean to upset anybody. I didn’t think there would be petitions.”
He continued: “I am sorry I have upset people. There were a lot of funny things in last night’s episode. People are forgetting things like us hanging out of a front room window. They are just concentrating on the ending.”
The 43-year-old also admitted he had not intended to announce the show’s ending when he rang in the day before.
He explained: “I think people thought it was a publicity stunt but what happened was I heard you were doing a Car Share playlist with the lovely tribute, so I thought it would be quite nice because I can basically see where you are from the roof of my house and I thought it would be lovely to give you a call and thank you.
“I never intended to talk about Car Share. You asked me about series three and I said I didn’t think there was going to be another, which there isn’t going to be, or a Christmas special. But I think people thought it was some kind of publicity plan.”
The conclusion left viewers begging for more as John (played by Peter) failed to communicate his feelings for Kayleigh (Sian Gibson), who stormed off out of the car.
Peter said the final scene, in which John is heard saying “I’m done” to his nan on the phone had been difficult to shoot.
He added: “I get a bit teary as well… it was hard to film. We did three takes and we only used the first one. It was quite sad when she got out, a bit strange.”
Peter Kay’s Car Share is available to view on BBC iPlayer.