[ugabaileyboy]

Got a code out of my 2000 HSE 4.6 for an alarm serial data link issue. My mechanic said for any alarm system related problems, I have to go to the stealership. Is there any way to avoid the hour drive and ensuing headache/walletache associated with that?

Details:

When alarm is activated, key has trouble disarming it. Car will crank, but not stay cranked. Revs to about 1300 RPMs and goes dead. No dash message for alarm fault or engine immobilization. Big mystery is how it sometimes starts fine...any ideas? Current solution = don't lock the car (not a good long-term plan)

 

[John W]

Sounds like you need to resync your BECM with the ECM.BBS sell an electronic reset tool to accomplish this.I am no expert on this,so I would wait to see what one of the more experienced contributors have to say about it.In the mean time have a look at the Blackbox solutions website and read up on the resync tool. :think:

 

[ugabaileyboy]

Thanks for the advice! Got an update/followup question...the mechanic said to leave the car unlocked and the alarm system wouldn't arm, theoretically creating a temporary solution. Tried this, and it worked for a couple of cranks, then did the same thing last night without the car ever having been locked/armed. Is my mechanic right with his assessment? Could the problem be something mechanical? The LR support line said to change the battery to a group 31 Interstate...maybe a fix?

 

[RRToadHall]

Unless your current battery if failing there would be no reason to change it. Have him complete the electrical sticky above and let us know.