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post #1 of 4 (permalink) Old 12-05-2018, 04:24 PM Thread Starter
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Brake light and turn signal not working 2008

I have a 2008 cobalt lt. The passenger rear brake light and turn signal stopped working a few days ago, taillight still works. The bulb I pulled out is a 3157nak it's an orange bulb. Everywhere I've looked says to replace it with a 3157 (clear bulb). So I replaced it with the 3157 and still have the same problem, taillight works but brake light and turn signal do not. Any ideas?
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post #2 of 4 (permalink) Old 12-05-2018, 04:27 PM
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Does the front work?

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post #3 of 4 (permalink) Old 12-05-2018, 04:31 PM Thread Starter
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Yes front passenger turn signal still works. Fast flashing as usual when the other goes out.
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post #4 of 4 (permalink) Old 12-05-2018, 04:40 PM
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Well that eliminates the BCM but not the wiring from the BCM. What you will need to do is check the voltage on that filament contact in the socket. Lay something on the brake pedal and if the driver's side brake light is on you should have 12 Volts on the passenger side too.

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Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

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