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Light Flashing On dash

(1990 Chevrolet 1500 Pickup)
in Lehigh Acres, FL on October 29, 2009
1990 chevrolet K1500 truck, 5.7 eng. THE RED LIGHT IS FLASHING ON THE DASH AND READS A CODE 4 WHAT DOES IT MEAN.
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Popular Answer
on October 30, 2009
The red light flashing is probably the "brake" light on your 1990 Chevrolet 1500 Pickup. The code 4 would indicate a fault with the RWAL valve switch. The ABS control module is seeing the RWAL valve switch closed or grounded when it should not be. Sorry I do not have a diagnostic chart available for the RWAL valve switch.
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