Question about 2002 Chevrolet Silverado 2500HD
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Posted on Jan 02, 2017
it is a communication error with the ecm from the ignition switch here is the code description
GM Number U1000
Type Network - Manufacturer Controlled DTC - Manufacturer Controlled
Description Class 2 Communication Malfunction Conditions
DTC B1327, U1300, U1301 and U1305 not current (any particular device on the Class 2 serial data circuit will support some subset of these codes), the ignition switch position requires serial data communication to occur, then at least one operating parameter has not been associated with an identification number within 5 seconds after beginning serial data communication (a default value is used)
Posted on Nov 14, 2008
SOURCE: 02 ultima troble codes u1000
These 2 codes indicate a communications problem within the CAN (Controller Area Network). The CAN network malfunction per Chilton lists 3 possible causes:
Posted on May 09, 2009
SOURCE: SES light just came on. Jiffy Lube said their free diagnostic tester gave a U1000 code that they have not seen before. Took car to dealer today for recall fix & told them about U1000 code. Said th
U1000 indicates a communications problem to the PCM (main computer) below is a post from the http://nissanhelp.com forum made by a Nissan Tech with step by step instructions on how to possibly fix the problem yourself. Best of luck.
Posted on May 21, 2009
Check the battery cables, make sure the clean and tight, also check the left body ground.
Those two codes are just for communications. They do not usally mean there is a fault in the system. It means that one modual was unable to talk to another modual for a split second.
Which modual had the codes stored in it?
Posted on Oct 25, 2009
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