BCM Issue - Chevy Impala Forums
Chevy Impala 7th Gen Discussion W-Body 2000-2005. Discuss all Chevy Impala 7th Generation Performance and Technical Discussion here.

User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 05-04-2013 Thread Starter
Junior Member
 
fresnodb's Avatar
 
Join Date: Apr 2010
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
Question BCM Issue

I'm hoping someone has run into this issue and has an answer. I have a 2002 3.8 that has a intermittent BCM issue. The car is in great shape for having 167K miles. Now that our weather is warm and requires A/C, the warning indicator starts scrolling through battery, security, and check engine. As this happens, the A/C cuts out, the BCM makes a clicking noise and chimes a couple times. When this happened last summer, I installed a new BCM but it would not program, either with the GM tool or by following the manual programming instructions. It wouldn't even start. I wasn't sure if either I got a bad BCM or maybe there was another issue with the car preventing the programming. I re installed the old unit. At least it starts and runs fine.
Thanks in advance for any help.
fresnodb is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 05-04-2013
Storm Trooper Ralf
 
MixedImpala04's Avatar
 
Join Date: May 2011
Location: merced, CA
Posts: 4,334
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 258
Thanked 342 Times in 266 Posts
the dealer has to program it. did you try and program it your self?
MixedImpala04 is offline  
The Following User Says Thank You to MixedImpala04 For This Useful Post:
fresnodb (05-04-2013)
post #3 of (permalink) Old 05-04-2013
Senior Member
 
jim1405's Avatar
 
Join Date: Sep 2012
Posts: 173
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 12
Thanked 16 Times in 13 Posts
Quote:
Originally Posted by fresnodb View Post
I'm hoping someone has run into this issue and has an answer. I have a 2002 3.8 that has a intermittent BCM issue. The car is in great shape for having 167K miles. Now that our weather is warm and requires A/C, the warning indicator starts scrolling through battery, security, and check engine. As this happens, the A/C cuts out, the BCM makes a clicking noise and chimes a couple times. When this happened last summer, I installed a new BCM but it would not program, either with the GM tool or by following the manual programming instructions. It wouldn't even start. I wasn't sure if either I got a bad BCM or maybe there was another issue with the car preventing the programming. I re installed the old unit. At least it starts and runs fine.
Thanks in advance for any help.
A faulty ignition switch can also cause these symptoms. My 2001 did all that and more. Replacing the ignition switch fixed all the issues.
jim1405 is offline  
The Following User Says Thank You to jim1405 For This Useful Post:
fresnodb (05-04-2013)
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 05-04-2013
Mr. Handy
 
g25racer's Avatar
 
Join Date: Apr 2012
Location: Michigan
Posts: 6,289
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 534
Thanked 851 Times in 680 Posts
^^ Yup common problem. Many people and Dealers replace the BCM when, in fact it is the ignition switch. Also, if ignored for a while the ignition switch can take out and kill the bcm. So, have a dealer reprogram the pcm, monitor all functions of car and dash lights. If any re-appear, replace the ignition switch and possibly the lock cylinder as well.




2001 Impala LS
TransGO Shift kit
Spectre Cone Filter
Thunderbolt Spun Cat
ZZP Alternator Power Cable
Wagner Thermoquiet Pads
KYB Strut Plus (Rr)
L67 Pass Eng Mount
Tinted tail lights
Painted Trim
Dipped Rims and emblems
Led plate, full interior, trunk, and console
Black interior accents (handles and switch panels)
JBL GTO 6.5" and 6x9"
Sony MEX-GS600BT
Hifonics Hifi 1500 (KnuKoncepts 4ga)
Rockford P3 @ 500rms
"Apply Dielectric Grease or I kick some arse"
g25racer is offline  
post #5 of (permalink) Old 05-04-2013 Thread Starter
Junior Member
 
fresnodb's Avatar
 
Join Date: Apr 2010
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
I had a chevy tech try with his GM tool. He was baffled too. That's why we thought it was a bad unit.
fresnodb is offline  
post #6 of (permalink) Old 05-04-2013
Mr. Handy
 
g25racer's Avatar
 
Join Date: Apr 2012
Location: Michigan
Posts: 6,289
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 534
Thanked 851 Times in 680 Posts
What do you mean by baffled? If he can't communicate with the BCM then, the bcm is either again fried or the ignition switch isn't supplying the voltage needed to the bcm.




2001 Impala LS
TransGO Shift kit
Spectre Cone Filter
Thunderbolt Spun Cat
ZZP Alternator Power Cable
Wagner Thermoquiet Pads
KYB Strut Plus (Rr)
L67 Pass Eng Mount
Tinted tail lights
Painted Trim
Dipped Rims and emblems
Led plate, full interior, trunk, and console
Black interior accents (handles and switch panels)
JBL GTO 6.5" and 6x9"
Sony MEX-GS600BT
Hifonics Hifi 1500 (KnuKoncepts 4ga)
Rockford P3 @ 500rms
"Apply Dielectric Grease or I kick some arse"
g25racer is offline  
The Following User Says Thank You to g25racer For This Useful Post:
fresnodb (05-04-2013)
post #7 of (permalink) Old 05-04-2013 Thread Starter
Junior Member
 
fresnodb's Avatar
 
Join Date: Apr 2010
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
Makes sense, i've heard of GM ign sw problems.
fresnodb is offline  
post #8 of (permalink) Old 05-04-2013 Thread Starter
Junior Member
 
fresnodb's Avatar
 
Join Date: Apr 2010
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
Thanks, i'll try this next.
fresnodb is offline  
post #9 of (permalink) Old 05-04-2013 Thread Starter
Junior Member
 
fresnodb's Avatar
 
Join Date: Apr 2010
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
I think i'll try the ign sw.
fresnodb is offline  
post #10 of (permalink) Old 05-04-2013
Mr. Handy
 
g25racer's Avatar
 
Join Date: Apr 2012
Location: Michigan
Posts: 6,289
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 534
Thanked 851 Times in 680 Posts
Yup, such a common problem with GM ign switches it isn't even funny. Many people have complained about this problem yet, GM doesn't issue a recall for it. Sorry to say but, that's how they make their money. Without the know how or research an ign switch replacement will require a dealer. Not to mention paying a dealer to re-program the bcm if that has failed as well.




2001 Impala LS
TransGO Shift kit
Spectre Cone Filter
Thunderbolt Spun Cat
ZZP Alternator Power Cable
Wagner Thermoquiet Pads
KYB Strut Plus (Rr)
L67 Pass Eng Mount
Tinted tail lights
Painted Trim
Dipped Rims and emblems
Led plate, full interior, trunk, and console
Black interior accents (handles and switch panels)
JBL GTO 6.5" and 6x9"
Sony MEX-GS600BT
Hifonics Hifi 1500 (KnuKoncepts 4ga)
Rockford P3 @ 500rms
"Apply Dielectric Grease or I kick some arse"
g25racer is offline  
The Following User Says Thank You to g25racer For This Useful Post:
fresnodb (05-05-2013)
post #11 of (permalink) Old 05-06-2013
8th Gen Antagonist
 
kingnutin's Avatar
 
Join Date: Mar 2009
Location: Vancouver , WA
Posts: 13,660
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Thanks: 517
Thanked 1,235 Times in 806 Posts
Following my write-up, a chimpanzee could replace an ignition switch luckily.

1978 Caprice Classic Landau
350 2-bolt, stock 4bbl
Stock rebuilt TH350
Edelbrock performer cam + intake
Dual 2 1/2" Flowmaster exhuast (waiting to be installed)
Edelbrock IAS Classic shocks
95 9C1 3.08 posi
4 wheel disc brakes!
16x8 American Racing Baja's with 225/60/16 Pirelli P4's

kingnutin is offline  
post #12 of (permalink) Old 05-19-2013 Thread Starter
Junior Member
 
fresnodb's Avatar
 
Join Date: Apr 2010
Posts: 10
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 4
Thanked 1 Time in 1 Post
FIXED! Nixed the ignition switch idea, pass code works and the BCM always has ignition voltage. Replaced the BCM. Past co-worker and good friend at the Chevy Dealer sold it to me at his cost. Had another friend and current co-worker coded it with his Tech 2. So far so good.
fresnodb is offline  
The Following User Says Thank You to fresnodb For This Useful Post:
darkeyce02 (05-19-2013)
post #13 of (permalink) Old 08-06-2014
Junior Member
 
cad2002's Avatar
 
Join Date: Aug 2014
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Been reading through this site and thought it was time to add my imput and questions. For a number of years I have been dealing with no start problem on 2002 Impala 3.4L. I wait for 12mins, another 12mins and sometimes another 12mins for the car to start. Dealer said a couple of different things could be the problem back many years ago but could not say 100% which one it was. Did not want to spend the money on the wrong fix and waited for the car to break. March 2012 it did, would not start and the mechanic with his tech II device determined it was the bcm because he could not communicate to it. Ordered, Cardone bcm remanu. Has worked well with a couple times last year not starting and again recently. But as of last week, the car would not start. Should have realized when the clock on the dash started to loose time and same problem many years ago. Before fix, received ignition light anti theft would come on and no start. This time no light, just won't start. The car turns over with interior lights etc come on but that is it. Decided to order ignition switch, ignition lock housing and ignition lock cylinder including keys. Thinking it is now the passlock sensor and swap it out. But after removing my ignition cylinder with key I noticed there seems to be a magnet on cylinder. Which I think would engage the passkey sensor i.e. a transfer of electrons from cylinder to passkey sensor magnet, thus receiving a voltage to pass through the 3 wires via the bcm and code for allowance of the car to start. Is my thinking incorrect?
SO MY QUESTION, WOULD IT NOT BE BETTER TO CHANGE OUT THE IGNITION LOCK CYLINDER WITH PASSKEY SENSOR, AND DO THE KEY RELEARN vs JUST CHANGING OUT THE IGNITION LOCK HOUSING WHICH IS COMPRISED OF THE PASSKEY SENSOR AND KEEPING THE ORIGINAL KEY? RockAuto web site on the product description leads me to interpret, that it’s the only problem and this will fix the problem at a low cost. Anyone on this sites have any thoughts? Received the parts today and hope for guidance on weather to change the switch and ignition lock cylinder with keys or change out the ignition lock housing which is the passkey sensor. Trying to figure out the best permutation or combination.
cad2002 is offline  
post #14 of (permalink) Old 08-06-2014
Mr. Handy
 
g25racer's Avatar
 
Join Date: Apr 2012
Location: Michigan
Posts: 6,289
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 534
Thanked 851 Times in 680 Posts
The passlock sensor and ign switch are common to fail. If the switch fails it can cause major damage. If you have the switch already .. replace it as well.




2001 Impala LS
TransGO Shift kit
Spectre Cone Filter
Thunderbolt Spun Cat
ZZP Alternator Power Cable
Wagner Thermoquiet Pads
KYB Strut Plus (Rr)
L67 Pass Eng Mount
Tinted tail lights
Painted Trim
Dipped Rims and emblems
Led plate, full interior, trunk, and console
Black interior accents (handles and switch panels)
JBL GTO 6.5" and 6x9"
Sony MEX-GS600BT
Hifonics Hifi 1500 (KnuKoncepts 4ga)
Rockford P3 @ 500rms
"Apply Dielectric Grease or I kick some arse"
g25racer is offline  
post #15 of (permalink) Old 08-06-2014
Junior Member
 
cad2002's Avatar
 
Join Date: Aug 2014
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by g25racer View Post
The passlock sensor and ign switch are common to fail. If the switch fails it can cause major damage. If you have the switch already .. replace it as well.
Thank you, I have a new switch and just tried new switch with original key and slid the passkey sensor into switch and turned over with power but no start. I waited over 10mins, wait for shut down and tried again and still no start. Seeing if it may start after the 3rd shut down. Wondering if doing the 3 cycle 10mins relearn procedure for a total 30mins would do anything with the original passkey sensor? Or should I go straight to new switch and pass lock sensor key and do the 30 mins relearn procedure? Or what about the new lock housing with senor and insert original key/tumbler? My concern on using pass lock sensor key is that documentation from the box says codes will not be cleared unless I have tech II device, don't have one.
cad2002 is offline  
Sponsored Links
Advertisement
 
Reply

Related Threads
Thread Thread Starter Forum Replies Last Post
Question on reprogramming the BCM Davec2008 Chevy Impala 8th Gen Discussion 6 02-05-2019 10:16 AM
Weird issue with door locks - ignition? RYD SLO Chevy Impala 7th Gen Discussion 0 05-15-2018 12:31 PM
Possible BCM Issue? AustinBytnar Autocare and Maintenance 0 04-28-2018 02:36 AM
2003 Impala Ls startup issue juskii Chevy Impala 8th Gen Discussion 0 08-24-2017 05:56 PM


Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome