PCM P1631 code after full flash

[danzick]

I bought an autocal for my truck awhile ago. I previously had a local shop loading my tune on the truck for me, but I decided to buy my own autocal. I had Kory update my file for me. I did a full flash. Now, the truck wont start and I'm getting the P1631 code. What did I do wrong?

 

[danzick]

tried the procedure that i found online. Try to start, wait 10 mins, try to start, wait 10 mins and its supposed to start the 3rd time. Well, no luck for me. I think the ECM is still ok. I can read the codes and everything fine.

 

[Awenta]

Security light stay on for 10 minutes each time? If not try turn to on wait till it goes off, turn key off for 10 seconds. Repeat 3x and then start.

Was the ecm locked before?

Sent from my SM-N910V using Tapatalk

 

[danzick]

locked? It had a tune in it and the truck ran fine? Actually, no. The first time, the lock is there. I try to start and no start. Leaving the key on, the lock is there for 10 mins. After it goes out, I try to start. No start. But, when I go to do the last round of 10 minute wait, the lock is not present.

 

[durawhore]

Repeat the step two more times but shut the ignition off for like 2 seconds these last two times

 

[danzick]

When I turn the key off and back on the lock symbol does not come on until I try to start it

 

[DAVe3283]

That is correct.

http://passlock.bloggstar.com/reset-passlock-vats/

Basically, get in, try to start the truck, and it will die. Leave the key on until the security light turns off (~10 minutes). Once the light turns off, turn the key off for 10 seconds, then try to start it again. It will start and die, and the security light will turn back on. Again, leave the key on until the light turns off (another ~10 minutes). Then turn it off for 10 seconds, and try to start it again. Again, it will die. Leave the key on again until the light turns off. Then turn off the key for 10 seconds, and try and start it again. This time (start attempt #4) it should start and stay running. That will cause it to learn the new password, and it shouldn't cause the problem again.

If you are having a problem with that procedure, you can get a GM Tech2 to reset the password instantly.

Alternatively, what I do is set the passlock learn time from 10 minutes to 30 seconds in my tunes, so that if/when the ECU freaks out like this, it only takes ~4 minutes to get going, instead of 30+ minutes. That does remove some of the security from your ECU, but I figure if someone is stealing the motor & ECU out of your vehicle, the difference between a 4 minute relearn and a 30 minute relearn isn't a big deal to them lol.

 

[danzick]

Thanks. Can I change the time with just an autocal or do I need a v2?

 

[Chevy1925]

the easier route is to call PPEI and have them send you a tune with VATS disabled.

 

[DAVe3283]

Thanks. Can I change the time with just an autocal or do I need a v2?

You need your tuner to adjust that time. I think you would then also need to do a full flash.

the easier route is to call PPEI and have them send you a tune with VATS disabled.

Or just adjust the time to like 30 seconds. Maybe I'm weird for wanting everything enabled/working on my truck? But turning off VATS would work, though it is more of a sledgehammer solution IMO.

Edit: if you have to have your tuner make changes for you, it is faster just to do the stupid 30 minute VATS relearn. That's what I recommend.

Sent from my FlashScan V2

 

[danzick]

I just had Kory shut it off. Thanks for the help everyone.

 

[Chevy1925]

You need your tuner to adjust that time. I think you would then also need to do a full flash.

Or just adjust the time to like 30 seconds. Maybe I'm weird for wanting everything enabled/working on my truck? But turning off VATS would work, though it is more of a sledgehammer solution IMO.

Edit: if you have to have your tuner make changes for you, it is faster just to do the stupid 30 minute VATS relearn. That's what I recommend.

Sent from my FlashScan V2

doesnt bother me to have it off. if someone wants your truck enough, they will get it regardless of VATS. also makes it easier to swap ECM's should you have one die on you or something and need to swap one in for testing.

 

[danzick]

doesnt bother me to have it off. if someone wants your truck enough, they will get it regardless of VATS. also makes it easier to swap ECM's should you have one die on you or something and need to swap one in for testing.

I have to agree with that. so, If I want to get another key made, do I need a chip key? or does just cutting the key work now?

 

[DAVe3283]

I have to agree with that. so, If I want to get another key made, do I need a chip key? or does just cutting the key work now?

A screwdriver will work now :spit:

 

[danzick]

Lol. I hope it never comes to that, but good to know I could if I had to.

 

[Chevy1925]

A screwdriver will work now :spit:

No, you still have pass lock to contend with. Specially being his/yours are a passlock 3 system.

 

[DAVe3283]

No, you still have pass lock to contend with. Specially being his/yours are a passlock 3 system.

I thought Pass lock 3 was 2007+? But either way, turning off VATS tells the ECU to ignore Pass lock. So it will start and run any time it sees a crank signal.

Sent from my FlashScan V2

 

[Chevy1925]

I thought Pass lock 3 was 2007+? But either way, turning off VATS tells the ECU to ignore Pass lock. So it will start and run any time it sees a crank signal.

Sent from my FlashScan V2

i think your right on the years but have you tried it? never worked on my truck when i was trying to setup my remote start. VATs has been disabled on my truck for years and i still had to bypass passlock to make my remote start work correctly. if the resistance in the tumbler isnt correct, regardless when the key get to the resistance pill for VATs, it wont start. Or atleast that is how i read it. basically, there are two different systems that can hold the truck from starting so throwing a screw driver in the ignition wont work.

 

[DAVe3283]

i think your right on the years but have you tried it? never worked on my truck when i was trying to setup my remote start. VATs has been disabled on my truck for years and i still had to bypass passlock to make my remote start work correctly. if the resistance in the tumbler isnt correct, regardless when the key get to the resistance pill for VATs, it wont start. Or atleast that is how i read it. basically, there are two different systems that can hold the truck from starting so throwing a screw driver in the ignition wont work.

I have not tried it on the diesel, but on the 2003-2005 gas motors, it allows you to start it by shorting wires once you disable VATS.

I have to replace my heater core this fall, so when I start pulling the interior out, I will unhook the passlock sensor from the ignition and see what happens. I could see it going either way.