AutoCodes - Buick - U1000 BUICK

U1000 BUICK Code - Invalid Or Missing Data For Primary Id

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U1000 BUICK code possible causes

  • Faulty Module that is not communicating
  • Module harness is open or shorted
  • Module circuit poor electrical connection

|How do I fix the U1000 BUICK code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|U1000 BUICK code 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

|Cost of diagnosing the U1000 BUICK code

Labor: 1.0

The cost of diagnosing the U1000 BUICK code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the U1000 BUICK code detected?

U1000 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.

|What are U1000 BUICK code possible symptoms?

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

|U1000 BUICK code 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 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, Diagnostic Trouble Code (DTC) U1000 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 class 2 serial data line on this vehicle is a star configuration, with the Body Control Module (BCM) and Powertrain Control Module (PCM) each have a second class 2 serial data line between them. The following modules communicate on the class 2 serial data line:
- Audio amplifier
- Body control module (BCM)
- Cellular telephone module w/UV8
- Dash integration module (DIM)
- Digital Radio Receiver (DRR)
- Driver Door Module (DDM)
- Driver Seat Module (DSM)
- 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)
- HVAC control module
- Hybrid Control Module (HCM)
- Instrument Panel Cluster (IPC)
- Powertrain/Engine Control Module (PCM/ECM)
- Radio
- Rear Seat Audio (RSA) Controller
- Rear Seat Entertainment (RSE) Assembly
- Rear Wheel Steering Control Module (RWSCM)
- Remote playback device-CD player (CDX)
- Transfer case shift control module (TCSCM)
- Transmission control module (TCM)
- Vehicle communication interface module (VCIM)
OBDII Code U1000 Buick - Invalid Or Missing Data For Primary Id -

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|U1000 BUICK code comments

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