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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Body Control Modules) >> Diagnostic Tests >> DTC U1001 & U1254: Loss Of XXX Communications >> Code Enable Criteria

Code Enable Criteria

WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Following condition must be met in order for DTC U1001 and U1254 to set; at least one critical operating parameter has not been associated with an identification number within about 5 seconds after beginning serial data communication.

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