Here’s a quick, useful tip from Alexander in Illinois related to a P1492 error code on a Chrysler 300M. Using vehicle data and a logical diagnostic process, he started at the ambient air sensor, which indicates to the PCM the approximate temperature of the vehicle’s battery. Suspecting a communication or voltage issue, he identified a problem with the reference voltage and then chased the problem from there. As he says, “Hope this helps someone!”
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