U1021 - SCP Invalid Or Missing Data For Air Conditioning Clutch

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

U1021 - SCP INVALID OR MISSING DATA FOR AIR CONDITIONING CLUTCH

Description:	-
Possible Causes:	Network DTC(s) occur during module to module communication failures. Two types of network faults can be categorized: Invalid data network faults - data is transferred within the normal intermodule message, but contains known invalid data. The transmitting module logs a DTC related to the invalid data fault. Missing message network faults - missing message faults are logged by module upon failure to receive a message from another module within a defined retry period.
Diagnostic Aids:	PERFORM the on-board diagnostics for the associated network module. For additional information concerning the description and operation of the vehicle communication network, REFER to the appropriate MODULE COMMUNICATIONS NETWORK article.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
All	Go to the appropriate CLIMATE CONTROL SYSTEM article.