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2003
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Chevy Express G2500, Van Cargo Extended, 5.3 T, 4L60E/M30
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Repair and Diagnosis
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Electrical
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Charging Systems
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Diagnostic Tests
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DTC P1638: Pulse Width Modulated Signal Out Of Range
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Conditions For Setting DTC
Conditions For Setting DTC
During the ignition ON test, the PCM detects a PWM signal is out of range.
During the RUN test, the PCM detects a PWM signal less then 5 percent for more than 6 seconds.