JG Perea: My 2004 impala was not starting intermittently. Sometimes it would work
fine, and then other times it would not start. Frustrating. Often I would
just wait a while and then it would start. I figured there was some problem
and decided to take it to a mechanic at the dealership after I replaced the
battery which was old anyway. Of course I take it to the mechanic and the
whole two days it was in the shop it always started fine.. They said they
could not diagnose it unless it would not start. Ok, understandable. I
bring the car home and a few days later the problem rears it's ugly head.
Off and on starting. I never knew if I went out somewhere if that was the
day I would end up stranded across town. Then there are towing costs. I
decided to take the care back to the mechanic and start replacing parts
through process of elimination. This is my decision. The mechanic says ok,
he would do it if this is what I wanted to do. I decide to go with the
ignition first. The mechanic thinks that it is more probable that the
problem would lie with the starter. I say ok. He puts in a new starter.
Have'nt had a problem since I put in the new starter. It has been starting
fine so far, knock on wood. I am telling you my experience. Your issue may
be entirely a different issue since the cars today are so complicated and
any one part can be the culprit. Good luck in troubleshooting. That seems
to be the hardest part of all this.
jeus alejandro: I have the same problem rite now any advise ?
Danny F: ?????
cypher24713: i put in a new ignition, still the same problem, 2 dealers later still the
same problem, the only thing this car does is drive me crazy.
Joel Garcia Jaquez: Ignition switch , I used to have this problem
javier zone: its the security anti theft, the pass lock is not receiving signals from
the the chip on the key, very expensive repair, only a gm dealer can
program the pass lock via enter net,you cannot remover from another car to
, once it is programmed to your car it can not be used on another car.
Richard De Melo: just leave your key in start for 10 min it will stop bleeking
after remove key put back key and start
dorian Johnson: Same thing just happened to mines the wire harness that was close to the
belt touched it and burnt wires I reconnected them started the car and
pulled it and it was the problem
g pof: Try checking the starter relay in the fuse box
Carter Entertainment Records: If this is a Factory Alarm: Unlock Driver or Passenger Door Or Disconnect
Positive Battery Cable. Open Driver Door & Leave Open. Turn Ignition Switch
to ON Position & Leave ON Reconnect Positive Battery Cable. Horn may sound
for a few seconds. Start Car.
Eric Scharf: Supersaber 105 has the right idea. It is the pass lock sensor that is
problem. That sensor is on the outside of the ignition lock cylinder (thing
that the key turns). The lock cylinder case surrounds that. The sensor can
be found on the lock cylinder case.
Paul R: My son went out in the garage and saw my car lights on so he took the keys
out. He was trying to do me a favor. I told him what I was trying to do,
with the car pass lock system. I went out and tried starting the car. To my
surprise it started. I left it running and went out and ran some errands.
The car started two more times while I was out. Go figure. I guess it is
working for now.
LolBruhhh: Security/Anti-theft system is jacked up. Have it checked.
bzzbeez69: I had the same problem with mine then I read online about someone who took
the ignition apart and put dielectric grease on the passkey connector pins.
I tried doing this and my problem went away and I have not had any issues
with the intermittent non-start problem.
berettaobd2: Im going through that same problem right now ignition fuse is good under
the hood the car has sat for a few months what do i check?
Carter Entertainment Records: (Continued) Turn OFF the ignition, and wait 5 seconds. Repeat steps 1-4 two
more times , for a total of 3 cycles and 30 minutes . The vehicle is now
ready to relearn the PASSLOCK Sensor Data Code and/or passwords on the next
ignition switch transition from OFF to CRANK. IMPORTANT: The vehicle learns
the PASSLOCK Sensor Data Code and/or passwords on the next ignition switch
transition from OFF to CRANK. You must turn the ignition OFF before
attempting to start the vehicle.
Mark Kirkander: had this issue as well, I took off the battery for 30 mins, put it back on
then waited 15 mins and it started fine and haven't had an issue since
bmb3488: missed the security light at the beginning.... if you have the same
symptoms minus that light, it's what i mentioned above.
Paul R: Well, I got the car started. But then I tried going through steps 1-4.
Turned off the car, then tried to re-start it. Of course it started, but
then tried it again so it would re-set the pass lock. Unfortunately, the
car didn't start. Now I am going through steps 1-4 again. It has been about
20 minutes and the "Security" light isn't going off (should only be about
10). Now what.
skate7920: Those cars suck had 2001 impala ls nothing but problems! Always overheating
& ignition problem my advice to you torch that garbish of car
DMaster Mensionz: get a new key at gm, do not cut one from a keymaker. leave it in the
keyhole for 15 mins to reprogram the pass lock
Chiboi993: I am having the same issue. The Chevrolet dealership told me I needed to
replace the Ignition lock cylinder because the sensor in there is going bad
and the car keeps thinking it is being stolen.
Dito24: U get It fixed? same is happening to me
Paul R: I am having that same Passlock issue. It happened about a year ago and
after several times of it not starting, I got the car to re-learn the pass
code. Now, about a year or more later it is the same thing. This time it is
giving me more trouble starting. I will leave the key to the ON position
and wait for the SECURITY light to go off (10 min. +). Then I try to start
and it does, However, the car is having trouble re-learning the pass code.
Joshua Potts: reprogram the ignition
Paul R: Now I am going to try the four steps that Carter Entertainment Records
mentioned. Hopefully this will re-set the passcode for at least another
year. Thanks to Carter E R for the post. It is the only one that seems to
work for my issue.
Matt Steiger: I've got the same problem with my 2001 Impala. No mechanic I've ever taken
it too has been able to fix it. Unfortunately, its just something that us
owners of this model of Impala just have to live with.
Carter Entertainment Records: (Continued) Start the engine. (The vehicle has now learned the PASSLOCK
Sensor Data Code and/or password.) Using a scan tool, clear any DTCs.
Otherwise, you can find the Light GREEN (-) wire at the BCM, on driver
side. Connect one end of a piece of wire to the Light GREEN (-) wire &
connect the other end of the piece of wire to Ground (chassis) That will
disarm the Alarm
Tina Blackmore: tap your starter could be that
Mark Beaks: my 02 ls did this, it's maddening. It's a ignition problem I dealt with
this for over 2 years until I cut the yellow security wire running to the
ignition and put a switch in the wire. The car must be running when you do
this with no security light on. This effectively overrides the security
system The toggle switch allows you to turn the security system on incase
you ever have to disconnect the battery. 3yrs and counting with no problerms
07CVPI: But if the shop knew ANYTHING then they would have disconnected the battery
before replacing the BCM in the first place, so he wouldn't still have the
Dionte kendrid: My 2001 ls is Doing the same this right now is your fixed
robthms42: Bad bcm goto gm and get a new one
Josh S: Open to any suggestions please comment.
kingviking25: Fuel might be the issue.
Carlos Nieto: My cousin has the same problem after his aftermarket alarm burn out trying
to find the problem the only things left to check is the ECU, the switch,
and the PCM
Joel Garcia Jaquez: starter?
07CVPI: Mine is doing this now, sometimes it's a loose battery lead and other times
you have to put the shifter all the way up and then down and back to park
for it to start.
iLuvHaters01: Mine was doinq that! I had to take it to my shevy dealer and they made a
new key for it. It had the black part on the handle where u turn it. . The
guy said thats what it needs. never make a copy of those kind of keys.
Arthur Cross: The Ignition switch tumblers go out on these cars all of the time. You have
to get a new switch that already comes with the sensor. Plus you have to
know how to reprogram it so that it can start sensing the new part. The
sequence can be found on line.
Mon Mitchell: Please tell me what you did to solve this problem
cmichael442: This "security" light flashing means car will not start for about 15m. Ive
had it for years really doesent worry me.
supersaber105: I had the same problem with my LeSabre. Turned out the contacts for the
passkey system inside the ignition lock were worn out. The mechanic
bypassed the system by putting an appropriately sized resistor in the
security line. Starts every time now, no problems. Not the recommended
solution, but it was definitely a lot cheaper than replacing the entire
bmb3488: check the "neutral safety switch" (pre-2003) or the "internal mode switch"
which is within the transaxle housing for 2003+ models. The car thinks it
is in a gear so it won't even attempt to start the car.
jtho53: Re-program the BCM
Steven Marlo: Have you got this fixed....if so what did you do?
jtho53: Seems that the BCM may have been the perp. Was it reprogrammed correctly?
jesus edier hernandez: i think is the body control module,if they put a cheap one,that one fail,i
put one on-off switch at the fuse,driver side,and i click it on and off
until the radio starts working,then the car starts,but i see the secu.
ligth flashing,try leaving the key on 30 minutes,[re-learning procedure]
but yes bcm drains the battery,unless u pull that fuse,mi engine overheated
badly,because bcm cut-off the fans,damn bcm
07CVPI: That's the absolute worst design flaw in a security key system that I've
ever heard LOL
Carter Entertainment Records: If you are refering to the PassLock: Be sure Battery is fully Charged: Turn
ON the ignition, with the engine OFF. Attempt to start the engine, then
release the key to ON (The vehicle will not start). Observe the Security
telltale, after approximately 10 minutes the telltale will turn OFF.