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Impala Base, 3.4 E
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DTC B1003: Programming Mode Active Message Not Received
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Conditions For Setting The DTC
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Conditions For Setting The DTC
The BCM does not receive an acknowledgment message from the RCDLR within 300 milliseconds of a second Programming Mode/Diagnostic Mode request.