P1207 Generator 2 Open Circuit?

[MechEngineer17]

Okay, everyone, I am at a loss with this one.

So I have a 2017 RAM 2500 running a RaceME Ultra.

Side note: the truck has dual alternators.

I have noticed nothing different with the truck, and the no dash lights or anything out of the ordinary have popped up.

About two days ago, I was digging around in my RaceME Ultra and wanted to click into DTC to see if it had any hidden codes, and to my surprise, it had one.

It read: P1207 generatortwo2 open circuit.

I called the local shop to find out if it was related to the alternator.

They believe it’s either a fuse or the driver-side alternator is on its way out.

Has anyone else ever dealt with this issue before?

Is it normal for the truck not to throw a dash light but still to have a DTC on the tuner?

Also, I checked all connections to make sure nothing was lost.

I will likely test voltage and all that fun stuff tonight, but I figured I’d ask while I’m at work.

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[AK Bob]

Okay, everyone, I am at a loss with this one.

So I have a 2017 RAM 2500 running a RaceME Ultra.

Side note: the truck has dual alternators.

I have noticed nothing different with the truck, and the no dash lights or anything out of the ordinary have popped up.

About two days ago, I was digging around in my RaceME Ultra and wanted to click into DTC to see if it had any hidden codes, and to my surprise, it had one.

It read: P1207 generatortwo2 open circuit.

I called the local shop to find out if it was related to the alternator.

They believe it’s either a fuse or the driver-side alternator is on its way out.

Has anyone else ever dealt with this issue before?

Is it normal for the truck not to throw a dash light but still to have a DTC on the tuner?

Also, I checked all connections to make sure nothing was lost.

I will likely test voltage and all that fun stuff tonight, but I figured I’d ask while I’m at work.

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See the troubleshooting information attached.

First, try clearing the code and see if it returns.

Many trouble codes (DTCs) don’t light the malfunction indicator lamp (MIL).

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[MechEngineer17]

See the troubleshooting information attached.

First, try clearing the code and see if it returns.

Many trouble codes (DTCs) don’t light the malfunction indicator lamp (MIL).

Awesome.

I have tried clearing and restarting the code but to no avail.

So, I will run through this and see what I can figure out!

I appreciate the response.

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[AK Bob]

Awesome.

I have tried clearing and restarting the code but to no avail.

So, I will run through this and see what I can figure out!

I appreciate the response.

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No problem, happy to help.

I was looking over the troubleshooting information, and on step #3, they mentioned checking the (A916) battery sense circuit for short to the auxiliary battery.

The (A916) wire is not shown on their partial wiring diagram, so I have attached the full charging system diagram.

As you can see, the (A916) wire comes from fuse #52 and goes to the Intelligent Battery Sensor.

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[MechEngineer17]

No problem, happy to help.

I was looking over the troubleshooting information, and on step #3, they mentioned checking the (A916) battery sense circuit for short to the auxiliary battery.

The (A916) wire is not shown on their partial wiring diagram, so I have attached the full charging system diagram.

As you can see, the (A916) wire comes from fuse #52 and goes to the Intelligent Battery Sensor.

So the weirdest thing happened.

I verified that all connections were tight, disconnected the fuses, reconnected them, and started the truck, but I forgot to clear the code before restarting it.

The code was there when I restarted the truck, but I drove home for about 30 minutes, sat in the driveway, and shut the truck off.

I decided to clear the code and restart the truck to see what it would do, but there was no code.

So, I'll do some testing tomorrow and see what happens.

I don't think it's a freak incident, but one of the fuses was dirty underneath, so I'm keeping my fingers crossed.


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[MechEngineer17]

Usually, when I first started the truck, it would populate the code almost instantly.

I let it idle for a few minutes and then shut her off.


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[Corkey]

Sounds like the poor connection on the fuse was the culprit, hopefully!

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