Three Hemi Error codes that just don't make sense - Help needed!

MikoS

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I've only recently joined the wonderful world of Hemi's, and so this is my first post. I have a 2016 Hemi SLT which has 3 error codes that AlfaOBD picks up and I cannot get rid of. My concern is that they may all be caused by some common hidden problem and not actually be three separate problems.
I should mention that I bought it wrecked, and although the damage was slight, the seat and side curtain airbags had deployed. I replaced those and had the Airbag module reset by Safety Restore Inc. However the Airbag light does come on occasionally and AlfaOBD picks up the code B21DD - 'System Voltage below Threshold' See screenshot below. As I see it this is the entire airbag system that has low voltage? Not just any one single airbag problem...? This code cannot be cleared although the Airbag light itself is only on occasionally. Like once or twice per month max.

The second code is B16D7 - 'Left Taillamp 1 Control short circuit to + battery/open circuit' I have replaced the bulb and inspected the wiring harness but can find no breaks or damage. I can clear this code but it will come back within 30 miles or so.

The third code is P0111 - 'Intake Air Temp Sensor 1 Circuit performance' I have replaced this IAT sensor and also run bench tests and the ohm readings etc are spot on. I read that this error can be caused by an out of range difference between it and the coolant Temp sensor. So I checked out the coolant sensor and it too checks out fine on a bench test. I can clear this code but it will come back within 30 miles or so.

Apologies that I've written such a lot but I felt to put out all the problems in case they are connected in any way.
I'm hoping that one of you Hemi guru's can offer some advice!

Thanks in advance!
MikoS

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jws123

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Test battery check all grounds make sure alternator is putting out good voltage as well.
 

huntergreen

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If it’s a fault with the battery /alternator , funky things happen.
 
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MikoS

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Test battery check all grounds make sure alternator is putting out good voltage as well.
Yes, I am hoping it is something like that. The battery is new though. The voltage on the instrument panel shows 14v when running so I guess the alternator is good too... but I'll check it properly with the meter tonight in case. And the grounds too
 

tron67j

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Check your taillight wiring. I have seen people crimp in wires for backup cameras, lighting, etc. and that can cause problems when it starts to rust out over time.
 

RASelkirk

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If it’s a fault with the battery /alternator , funky things happen.
With my '98 Dakota R/T, I always got a warning that the battery was about to take a dump. Everything would behave normally. including startup, but the IAC motor would stick shut. Those couple times I had to drive home from work feathering the throttle so it wouldn't die in traffic.

Russ
 

PoMansRam

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Are there any aftermarket electronics on the vehicle? Any off brand LED replacement bulbs?
 

turkeybird56

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Yes, I am hoping it is something like that. The battery is new though. The voltage on the instrument panel shows 14v when running so I guess the alternator is good too... but I'll check it properly with the meter tonight in case. And the grounds too
Should be more than 14V on Battery, on panel. Should be 14.5 or 14.6 V being read. Use Volt/Multi Meter across battery terminals or positive and behind batt sensor on negative. Also shut down completely, turn all off, raise hood, close door. When all shuts down, check voltage across terminals, should be 12.4 to 12.6, NE thing under 12, battery starting to go. After that, check on the other recommendations above. With air bag going off and all, might be a crimped, pinched wire also.

ADDED: Make sure U use a multi-meter/volt meter to check and not rely on FCA lie-o-meters, LMAO. But I do find my interior Batt Voltage meter is usually pretty close, more or less. My Lie-O-Meter in the truck actually reads 2/10's (.2) lower than what I get on a Digital Multi-Meter, just FYI for all.
 
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MikoS

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Should be more than 14V on Battery, on panel. Should be 14.5 or 14.6 V being read. Use Volt/Multi Meter across battery terminals or positive and behind batt sensor on negative. Also shut down completely, turn all off, raise hood, close door. When all shuts down, check voltage across terminals, should be 12.4 to 12.6, NE thing under 12, battery starting to go. After that, check on the other recommendations above. With air bag going off and all, might be a crimped, pinched wire also.

ADDED: Make sure U use a multi-meter/volt meter to check and not rely on FCA lie-o-meters, LMAO. But I do find my interior Batt Voltage meter is usually pretty close, more or less.
Thanks for this. I'll get on to it as soon as I get a chance and update here. Unfortunately time is not my friend right now:(
 
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