P0621 Generator L-Terminal Circuit - Chevy and GMC Duramax Diesel Forum
General Discussion General Diesel Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 04-21-2009, 11:32 PM Thread Starter
Senior Member
 
Tyler_LS1's Avatar
 
Join Date: Aug 2008
Location: Warner Robins, GA
Posts: 473
Lightbulb P0621 Generator L-Terminal Circuit

What does this mean?

P0621 Generator L-Terminal Circuit

it was brought up on a scan on a 06 LBZ

Thanks

USAF
2006 Silverado LBZ ECSB - BatMo s475 - DA built trans - Exergy 60 overs - EFI/DSP5 and supporting mods
Thanks to Dustin at Diesel Addiction.
Old owner ran 12.4 @106 with just a built trans and tuning. No new times with current set up

1999 Camaro SS LS1 6-speed - bolt-ons
12.6 at 111 N/A stock motor (SOLD)
Tyler_LS1 is offline  
Sponsored Links
Advertisement
 
post #2 of 3 (permalink) Old 04-21-2009, 11:42 PM
Junior Member
 
Join Date: Mar 2009
Location: Birmingham, AL
Posts: 58
Send a message via AIM to dieseltekbham
Do these steps
Ignition OFF, disconnect the harness connector at the generator.
Ignition ON, test for less than 1 volt between the generator turn ON signal circuit terminal B and ground.
⇒ If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM/PCM.

Engine running, test for greater than 3.5 volts between the generator turn ON signal circuit terminal B and ground.
⇒ If less than the specified range, test the circuit for a short to ground, an open or a high resistance. If the circuit tests normal, replace the ECM/PCM.

If the circuit test normal, replace the generator.
dieseltekbham is offline  
post #3 of 3 (permalink) Old 04-21-2009, 11:45 PM Thread Starter
Senior Member
 
Tyler_LS1's Avatar
 
Join Date: Aug 2008
Location: Warner Robins, GA
Posts: 473
wow, thanks.

sounds complicating, i dont have the truck with me to test it. i did a prepurchase inspection and it came up. so is it a big deal?

USAF
2006 Silverado LBZ ECSB - BatMo s475 - DA built trans - Exergy 60 overs - EFI/DSP5 and supporting mods
Thanks to Dustin at Diesel Addiction.
Old owner ran 12.4 @106 with just a built trans and tuning. No new times with current set up

1999 Camaro SS LS1 6-speed - bolt-ons
12.6 at 111 N/A stock motor (SOLD)
Tyler_LS1 is offline  
Sponsored Links
Advertisement
 
Reply
Gear in this thread - Powered by O'Reilly Auto Parts

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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