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Chevy Express H2500
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DTC P1638: Pulse Width Modulated Signal Out Of Range
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Conditions For Clearing DTC
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Conditions For Clearing DTC
The Conditions for Setting the DTC are no longer present.
A history DTC will clear after 40 malfunction free ignition cycles.
The Powertrain Control Module (PCM) receives the clear code command from the scan tool.