Low Voltage DTC

Hey all!!!

So I just finished putting in a Whipple 2.9 into my 2012 GT500 along with the LP plug and play fuel pump voltage booster and some ID 1050x injectors and LUND tune. So on my last data log with Lund I was doing a WOT pull and my car threw a code for low voltage to the PCM. Now the car didn't shut down or stall out and all the numbers in the datalog looked good, in fact the tuner from Lund was really happy with the numbers (therefor so was I lol). However I told him about the code and he mentioned that it was most likely an alternator issue or just an isolated indecent all together. However this got me thinking days after the datalog, could the fuel pump voltage booster working at peak capacity at WOT be the cause of the dip in voltage? The DTC has not occurred since, but in all fairness I have not done any WOT pulls up to 6500 either. Anyone got some insight? Thanks everyone!

Increased electrical load can expose a weak alternator. Review the datalog where the DTC occurred, if battery voltage was being logged (it should be). You should be able to see where the voltage drop occurred. Then see if you can repeat the event under the same conditions while datalogging. If you end up replacing your alternator, don't replace it with an OEM unit... they are hit or miss on quality and usually end up failing again. Here is my ordeal:

https://www.svtperformance.com/threads/how-well-is-your-alternator-performing.1159061/#post-15898038

How old is the battery?

69b302 said:

How old is the battery?

Click to expand...

Less than 2 years

SCGallo2 said:

Increased electrical load can expose a weak alternator. Review the datalog where the DTC occurred, if battery voltage was being logged (it should be). You should be able to see where the voltage drop occurred. Then see if you can repeat the event under the same conditions while datalogging. If you end up replacing your alternator, don't replace it with an OEM unit... they are hit or miss on quality and usually end up failing again. Here is my ordeal:

https://www.svtperformance.com/threads/how-well-is-your-alternator-performing.1159061/#post-15898038

Click to expand...

Based on your link and my current mods I'm beginning to look at the PA performance 200a alternators.