BCM Codes - Chevy Colorado & GMC Canyon
 
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post #1 of 14 (permalink) Old 02-05-2008, 01:47 PM Thread Starter
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BCM Codes

Does any one have a list of BCM Codes? I had a friend of my bring in a GM diagnostic tool to help me with the no drivers window or door lock problem. When he pulled up the BCM, it came up with a code B1420 Voltage Malfunction. Is there any way to find out what that code means and what all it affects?

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post #2 of 14 (permalink) Old 02-05-2008, 02:19 PM
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It means that the BCM sensed an odd voltage. Either because you were modifying something related to the electrical system or because your battery is dying.

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post #3 of 14 (permalink) Old 02-05-2008, 03:03 PM Thread Starter
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I understand that, but I just put in a new Optima Red Top, but the problem still persists. I have been hoping that it will auto correct itself, but it's been about 2 weeks now.

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post #4 of 14 (permalink) Old 02-05-2008, 03:05 PM
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It takes time for the problem to fix its self. Some said couple hours. Some have it go on for days and days.
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post #5 of 14 (permalink) Old 02-05-2008, 03:12 PM
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Also check that your battery terminals are tight. That can cause transient problems.

05 Canyon EC SLE - I5M Z71 GT4
V1 | FRAM Boost+RamAir | LED + HAW Strobes | BFG 33-12.5-15
Rancho | Bubaloo Skidz | MBRP Dumped System
Cat Gut| 3 x Lightforce Blitz | eFan | PCMforless <- very unhappy
1.5" TB/AAL/1" BL | Fold-A-Cover | Line-X OTR | Brake Box
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post #6 of 14 (permalink) Old 02-05-2008, 03:36 PM
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Quote:
Originally Posted by rangerbob
Also check that your battery terminals are tight. That can cause transient problems.
I heard that somewhere before... Who was posting that info earlier and where is that thread? That thread was informative about this issue, I need to find it again.
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post #7 of 14 (permalink) Old 02-05-2008, 03:42 PM
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Uh.... I don't remember where it was. I just know that lots of folks have found this to be a problem.

05 Canyon EC SLE - I5M Z71 GT4
V1 | FRAM Boost+RamAir | LED + HAW Strobes | BFG 33-12.5-15
Rancho | Bubaloo Skidz | MBRP Dumped System
Cat Gut| 3 x Lightforce Blitz | eFan | PCMforless <- very unhappy
1.5" TB/AAL/1" BL | Fold-A-Cover | Line-X OTR | Brake Box
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post #8 of 14 (permalink) Old 02-05-2008, 04:55 PM Thread Starter
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The terminals are tight, but for the hell of it, I may switch them out.

2006 Xtreme CC
Kenwood Excelon DNX-9140 w/iTouch
Pioneer Premier 6 1/2s in doors, Pioneer tweeters
De-Badged and Belltech 1.5"/2" Drop
If you like it Stock, you're easily amused!
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post #9 of 14 (permalink) Old 02-05-2008, 06:44 PM
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I get this problem every time I mess with my stereo/speakers. It has happened 4 times since Christmas. Disconnect your negative battery terminal and physically make it touch the positive terminal for about 20 minutes. This will discharge all charge stored in your trucks computers thus wiping the memory. Disconnecting the neg terminal is not enough. You must connect it to the positive terminal to discharge your truck's electrical system. It works for me every time. If it doesn't work for you I suggest going to the dealership and getting a new driver's door master switch assembly (pwr locks.windows). That has cured the problem for some of guys as some of the switches have been found to be defective. Good luck!!!

Also, check this out: http://www.coloradofans.com/forum/viewtopic.php?t=7277

EDITED:

Wow....I didn't realize you were in Germany because I am a dunce...I guess you can't just bomb down to local dealership for a part/service. Anyway, I hope I helped in some way.

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post #10 of 14 (permalink) Old 02-06-2008, 01:58 PM Thread Starter
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Quote:
Originally Posted by tjm276
Disconnect your negative battery terminal and physically make it touch the positive terminal for about 20 minutes.
Wow....I didn't realize you were in Germany because I am a dunce...I guess you can't just bomb down to local dealership for a part/service. Anyway, I hope I helped in some way.
I tried that just not for 20 Min, I will do that next and give you an update. Yeah, Germany is cool until you need US parts.

2006 Xtreme CC
Kenwood Excelon DNX-9140 w/iTouch
Pioneer Premier 6 1/2s in doors, Pioneer tweeters
De-Badged and Belltech 1.5"/2" Drop
If you like it Stock, you're easily amused!
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post #11 of 14 (permalink) Old 02-06-2008, 05:40 PM
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Quote:
Originally Posted by Wrayzor
Quote:
Originally Posted by tjm276
Disconnect your negative battery terminal and physically make it touch the positive terminal for about 20 minutes.
Wow....I didn't realize you were in Germany because I am a dunce...I guess you can't just bomb down to local dealership for a part/service. Anyway, I hope I helped in some way.
I tried that just not for 20 Min, I will do that next and give you an update. Yeah, Germany is cool until you need US parts.
Yeah, I have done it and not let it sit long enough and the BCM did not reset and the door lock/power window failure persisted. I think you will need to let it sit for at least 20 minutes. If it doesn't work the first time give it another try right away for another 20 minutes. If that doesn't work then I would suspect you have a bad switch in your driver door.

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post #12 of 14 (permalink) Old 02-07-2008, 01:10 PM
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The other thing to do is touch the removed lead to the other to complete the circuit and let it drain.

05 Canyon EC SLE - I5M Z71 GT4
V1 | FRAM Boost+RamAir | LED + HAW Strobes | BFG 33-12.5-15
Rancho | Bubaloo Skidz | MBRP Dumped System
Cat Gut| 3 x Lightforce Blitz | eFan | PCMforless <- very unhappy
1.5" TB/AAL/1" BL | Fold-A-Cover | Line-X OTR | Brake Box
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post #13 of 14 (permalink) Old 02-23-2008, 12:12 PM
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Quote:
Originally Posted by Wrayzor
Quote:
Originally Posted by tjm276
Disconnect your negative battery terminal and physically make it touch the positive terminal for about 20 minutes.
Wow....I didn't realize you were in Germany because I am a dunce...I guess you can't just bomb down to local dealership for a part/service. Anyway, I hope I helped in some way.
I tried that just not for 20 Min, I will do that next and give you an update. Yeah, Germany is cool until you need US parts.
Drop me a PM, I have a Scangauge 2 and it clears/checks codes. I live in Speicher.
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post #14 of 14 (permalink) Old 02-25-2008, 07:08 AM
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Re: BCM Codes

Quote:
Originally Posted by Wrayzor
Does any one have a list of BCM Codes? I had a friend of my bring in a GM diagnostic tool to help me with the no drivers window or door lock problem. When he pulled up the BCM, it came up with a code B1420 Voltage Malfunction. Is there any way to find out what that code means and what all it affects?
DTC B1420
Circuit Description

The body control module (BCM) monitors the battery voltage through the battery positive voltage circuit from the TBC fuse.
DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1420 Device Voltage
Conditions for Running the DTC

The voltage supplied to the BCM is in the range of 7-26 volts.
Conditions for Setting the DTC

* The BCM senses a battery voltage above 16.7 volts.
* The above condition lasts for at least 1 second.

Action Taken When the DTC sets

* The BCM will disable all its outputs.
* The setting of this DTC inhibits the setting of other DTCs.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Diagnostic Aids

* The following may cause an intermittent:
o A damaged terminal
o A backed out terminal
o A poor terminal tension
o A chafed wire
o A broken wire inside the insulation
* When diagnosing an intermittent short or an open, manipulate the wire harness while watching the test equipment for changes.
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