OBDII Code List

U1000 CADILLAC - Invalid or Missing Data for Primary Id

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

Tech notes

As with all loss of communication concerns, inspect the power, ground, and serial data circuits to the suspect module prior to replacing any parts

When is the code detected?

U10000 is set when the control module does not receive a message that it was expecting from another control module, and does not know which control module did not send that message.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

U1000 Cadillac Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message. These node alive messages are used for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, DTC U1000 or U1255 is set. When more than one critical parameter does not have an identification number associated with it, the DTC will only be reported once. The following modules communicate on the class 2 serial data circuit:

- Audio amplifier

- Cellular telephone module w/UV8

- Dash integration module (DIM)

- Digital radio receiver

- Driver door module (DDM)

- Driver door switch assembly (DDSA)

- Electronic brake control module (EBCM)

- Electronic suspension control module (ESC)

- Front passenger door module (FPDM)

- Inflatable restraint sensing and diagnostic module (SDM)

OBDII Code U1000 Cadillac - Invalid or Missing Data for Primary Id -

Need more help?

Get the U1000 Cadillac code diagnosed by a professional: Find a repair shop in your area

Related Information

U1000 CADILLAC Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the U1000 Cadillac code? Have you replaced any parts?
Any information is appreciated. Thanks
Top ⇧