DTC Parameters
WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Voltage supplied to the module must be in the normal operating voltage range (approximately 9-16 volts). DTC 1301 must not be current. When no message is detected from a learned identification number for 5 seconds, a DTC U1xxx (where xxx is equal to the 3-digit module identification number) is set.