04 PATS trouble
#1
Senior Member
Thread Starter
04 PATS trouble
Hey guys. My mom's 04 expy is throwing a B1681 code (pats error) and I can't figure out the fix. I'm decent with electrical stuff and can't find any shorts. The truck will crank fine but obviously won't start. It used to just be an intermentant issue but now it won't go away. The first time it happened I disconnected the Xpress box to disable the remote start I put in a while back and it fixed the issue for a while. Then it would do it every now and then but always "fix" it's self within 10 minutes. Well it has been 2 days now and it's still not working. I went ahead and took out the whole Xpress wiring harness and it didn't help. Do yall have any other suggestions? I had mpt turn my PATs system off a while back on my 2000 F150 (needed a new key and it was cheaper to have them update my tune to bypass PATs then program a new key, plus it made the remote start a simpler install). But, to tune a second vehicle I have to send my programmer to Sct to have it unlocked then buy another tune from Mpt so it will end up being like $200. Always an option to do that but I would rather fix the issue.
#2
Moderator
Have you tried multiple keys? Maybe the chip in the key is bad?
#3
Senior Member
Thread Starter
#4
Senior Member
Thread Starter
It's wierd because the anti theft light isn't flashing any codes. I'm just pulling that one code by hooking my 3015 up to it. I don't see any problems with the wiring harness so maybe the ignition immobilizer/key transponder is bad? I hate to just throw parts at something but that's only $10 so maybe its worth a shot. Originally I thought it was the fuel pump relay (r303) inside the fuse box so I took that hole thing out and the relay wasn't burnt up so I know that's not the issue either. I'm not a 100% sure but the 4.6 doesn't have the FPDM right? I know more about tenth gens.
#5
Moderator
It's wierd because the anti theft light isn't flashing any codes. I'm just pulling that one code by hooking my 3015 up to it. I don't see any problems with the wiring harness so maybe the ignition immobilizer/key transponder is bad? I hate to just throw parts at something but that's only $10 so maybe its worth a shot. Originally I thought it was the fuel pump relay (r303) inside the fuse box so I took that hole thing out and the relay wasn't burnt up so I know that's not the issue either. I'm not a 100% sure but the 4.6 doesn't have the FPDM right? I know more about tenth gens.
#6
Senior Member
Thread Starter
I'll check it out tommorow after work. Ended up finding a key immobilizer for $7 so I decided to grab that to see if it helps.
#7
Senior Member
Thread Starter
I'm tired of ****ing with this thing I'm ready to load it with tannerite and blow it to hell. I have tried everything, new transceiver, new connections, traced all the wiring, still nothing. Any last tips before we dump 250 into getting this hell of system tuned out
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#8
Moderator
It could just be an error in the computer and getting it flashed at a dealer might be the only way to fix it.
#9
Moderator
Did the expy have a FPDM?
#10
Senior Member
Thread Starter
Nope looks like the 4.6 didnt get it in the 04 model