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Old Oct 7, 2021 | 07:12 PM
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Default Strange DTC

I’m showing a B256A unfortunately the shop manual shows nothing (does not exist) I found a Cadillac reference which says the cargo (hatch lights) are shorted to ground. Both are working just fine. Any ideas?
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Old Oct 7, 2021 | 09:31 PM
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What are you using for a scan tool?
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Old Oct 8, 2021 | 06:12 AM
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Originally Posted by laserdude2215
What are you using for a scan tool?
Hp tuners scanner
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Old Oct 8, 2021 | 07:46 AM
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What happens when u clear it ?
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Old Oct 8, 2021 | 07:52 AM
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Originally Posted by Dcasole
What happens when u clear it ?
Comes back after a few min. Of driving, I’m going to check with a different scanner and also see what the HP tuner says about the settings for the code
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Old Oct 8, 2021 | 08:05 AM
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I have never seen this code , the only reference to
256 is a ECM code for injection shut off ... that's crazy..

good luck finding out what it is and make sure u let us know

Dave

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Old Oct 8, 2021 | 08:11 AM
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Originally Posted by Dcasole
I have never seen this code , the only reference to
256 is a ECM code for injection shut off ... that's crazy..

good luck finding out what it is and make sure u let us know

Dave
yep that’s why I’m stumped
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Old Oct 8, 2021 | 11:00 AM
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Other than the fault you are seeing are you experiencing any issues? I ask because you may be chasing a "ghost fault."
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Old Oct 8, 2021 | 03:13 PM
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Originally Posted by ss2z06
Other than the fault you are seeing are you experiencing any issues? I ask because you may be chasing a "ghost fault."
well the latest is from another scanner which says open circuit to cargo lamps. I did put in LED lights a few weeks ago they worked fine till yesterday so that may or may not be the problem. I did find one web site that said that this was not covered in the Chevy FSM
nasty to leave things out!
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Old Oct 8, 2021 | 04:53 PM
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Actron.com won't show me a 2016 but a 2015 model says "B256A
Liftgate Lamp Control Circuit"
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Old Oct 8, 2021 | 05:24 PM
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The correct codes for the rear compartment courtesy lamps would be B2570 02 or B2570 04.
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Old Oct 9, 2021 | 03:20 PM
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Latest update. It was a new tune file that did it so yes it is a Ghost code.
now if my tuner can figure out why & fix it all will be well
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Old Oct 9, 2021 | 11:07 PM
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Originally Posted by ErnieN85
Latest update. It was a new tune file that did it so yes it is a Ghost code.
now if my tuner can figure out why & fix it all will be well
Glad to hear you’re getting closer to solving this.
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Old Oct 10, 2021 | 08:37 AM
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Originally Posted by ErnieN85
Latest update. It was a new tune file that did it so yes it is a Ghost code.
now if my tuner can figure out why & fix it all will be well
Wow , that's just crazy that an ECM tune would pop a BCM , or we think it's a BCM code , I will be interested in his findings and thanks for the update

Dave
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Old Oct 12, 2021 | 02:45 PM
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I've seen lots of weird stuff come from the BCM when the proper process isn't followed when flashing a tune.

That being said, I searched the service manual for b256a and it doesn't even seem to be a valid code for a corvette (I searched for a 2016). What year is your car? I think it's safe to say it's a lighting code, but as to what caused it it could very well be those LEDs. There's no way this is throwing a CEL however.
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Old Oct 12, 2021 | 06:38 PM
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Originally Posted by sevinn
I've seen lots of weird stuff come from the BCM when the proper process isn't followed when flashing a tune.

That being said, I searched the service manual for b256a and it doesn't even seem to be a valid code for a corvette (I searched for a 2016). What year is your car? I think it's safe to say it's a lighting code, but as to what caused it it could very well be those LEDs. There's no way this is throwing a CEL however.
Yep, my tuner can’’t figure it out either. I’m going to log again with a new set up he sen and hope that works.
When I go back to th tune before this one everything works fine so maybe it dropped a bit to two in the process
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