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One rear signal light is random

hmperf

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Every once in a while I get fast dash signal indicator when I use my right blinker. one of the 3 bars (the inner most) is occasionally out.

If I unplug the the pigtail in the trunk while the signals are on, it fixes it. If the signals arent on, it doesnt fix it. There are no bent pins, no corrosion, no nothing. I notice it happens more often when the car sits for a week or so.

Any ideas?
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HizliBullet

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water damage?
 
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hmperf

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JOKER M1

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I’m working on getting the same issue resolved........SSM 45895 - 2015-2016 Mustang Built On Or Before 4/22/2016 - Rear Tail Lamp, Turn Lamp Or Stop Lamp Partial Outage - DTCs B1271, B1272, B1273, B1274, B1275 or B1276.
Some 2015 and 2016 Mustang vehicles built on or before 4/22/2016 may exhibit a partial outage of the rear tail, turn signal or stop lamps following a vehicle start with a low battery. This may be accompanied by any combination of DTCs B1271, B1272, B1273, B1274, B1275 and B1276. The condition typically clears on vehicle restart. Reprogram the BCMB module to the latest calibration using IDS release 101.01 or higher. Calibration files may also be obtained at www.motorcraftservice.com. Use applicable labor operations from Section 10 of the SLTS manual and use causal part 13C788
 
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hmperf

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I’m working on getting the same issue resolved........SSM 45895 - 2015-2016 Mustang Built On Or Before 4/22/2016 - Rear Tail Lamp, Turn Lamp Or Stop Lamp Partial Outage - DTCs B1271, B1272, B1273, B1274, B1275 or B1276.
Some 2015 and 2016 Mustang vehicles built on or before 4/22/2016 may exhibit a partial outage of the rear tail, turn signal or stop lamps following a vehicle start with a low battery. This may be accompanied by any combination of DTCs B1271, B1272, B1273, B1274, B1275 and B1276. The condition typically clears on vehicle restart. Reprogram the BCMB module to the latest calibration using IDS release 101.01 or higher. Calibration files may also be obtained at www.motorcraftservice.com. Use applicable labor operations from Section 10 of the SLTS manual and use causal part 13C788
This is great information, thank you. Each time it happened it was parked for a long time so Im guessing I fall into this category. Ill check out the BCM upgrade
 

JOKER M1

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[MENTION=29024]hmperf[/MENTION] as of now my situation is gone. I put the battery on a tender for a couple days, afterwards I disconnected the battery negative for a short period of time.I’ll keep my fingers crossed. If you haven’t already then you may want to try this plus this has been mentioned by other members
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