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  #1  
Old 04-20-2013, 10:33 PM
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P0620

My battery light kept coming on and I noticed the voltage on my mini max dropping from time to time. Brand new batteries in the truck about a month ago so I assumed possibly the alternator. Recently having a stud job done i thought maybe a lose wire. Sure enough, the positive to the alternator was loose and had nearly arched the stub in two. Picked up a new alternator and installed it today. Now I have P0620 that won't go away. I've cleared it numerous times and it pops back up within a minute. Voltage reads 12.0-12.5 on my mini before cranking. After cranking it reads 13.3 all the time. I looked for loose connections, and blown fuses and had no luck. Any suggestions would be greatly appreciated.



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Old 04-20-2013, 11:13 PM
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Dual alternators?
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Old 04-20-2013, 11:44 PM
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Single


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Old 04-20-2013, 11:52 PM
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Maybe PCM, have you cycled three times for possible re-learn configuration?
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Old 04-20-2013, 11:57 PM
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No. Cycle the key three times to trigger that? I'm not familiar with it.


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Old 04-21-2013, 12:06 AM
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Have a look....
Quote:
Originally Posted by JUGERNAUT View Post
Check the operation of the charging system warning indicator in the instrument cluster (IC) as follows:
With the key in the OFF position, the charging system warning indicator should be off.
With the key in the ON position and the engine off, the charging system warning indicator should be on.
With the engine running, the charging system warning indicator should be off.
NOTE: The PCM requires 3 key cycles to re-learn the configuration.

P0620 Primary Generator Control Circuit PCM

did you check Check : Fusible link SDC02. sometimes they burn up when it fries
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Old 04-21-2013, 12:49 AM
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Ill give it a try.


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Old 04-21-2013, 01:01 AM
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No luck. Battery light still coming on less than a minute after start up. Cleared code, cycled key 3 times, started and same thing happened.


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Old 04-21-2013, 02:02 AM
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Hmmm...I could only imagine it being an open and or short circuit which is causing the PCM to throw that DTC. Maybe run a continuity test? Or disconnect batteries and try again.
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Old 04-21-2013, 02:16 AM
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I get off work here soon. I will take a look at mine and run a few test trials on something that might work, will get back to you before noon EST.
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