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Home >> Chevrolet >> 2002 >> Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL6 >> Repair and Diagnosis >> Electrical >> Charging Systems >> Charging System >> Diagnostic Tests >> DTC P1638: Pulse Width Modulated Signal Out Of Range >> 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.

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