For 1990-2009 cars

### Circuit Description

This code (both current and history) is stored in the body control module (BCM). This code indicates that the instrument cluster has sensed a loss of the serial peripheral interface (SPI) data from the BCM.

### Conditions for Setting the DTC

All of the following conditions must be met:

• | Ignition 0 is active.

• | The serial data transmitted from the BCM to the instrument panel cluster (IPC) is incorrect for 12 seconds.

### Action Taken When the DTC Sets

• | Stores DTC U2000 in the BCM memory

• | The fuel gauge is at zero.

• | The temperature gauge is at zero.

• | The THEFT SYSTEM, ABS, and SERVICE VEHICLE SOON indicators illuminate.

### Conditions for Clearing the DTC

• | The BCM goes to sleep and reinitializes with the malfunction cleared.

• | All the BCM history codes will be cleared after 100 ignition cycles (from OFF to RUN) with no current codes active during the 100 ignition cycles.

• | Use the scan tool.

### Diagnostic Aids

• | Diagnose DTC U2001 BEFORE diagnosing DTC U2000.

• | With the ignition switch in the ON position, test for voltage transmissions on the SPI data line.

• | If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This may often cause the malfunction to appear.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open.
1 | Was the body control module (BCM) Diagnostic System Check performed? | -- | Go to Step 2 | Go to Body Control Module System Check
2 | Diagnose and repair DTC U2001 through U2007. Is the repair complete? | -- | Go to Step 5 | Go to Step 3
3 | Use the scan tool in order to check if DTC U2000 is current without any DTCs within DTC U2001 through U2007 as current codes. Is U2000 a current DTC without any DTCs within DTC U2001 through 2007 as current codes? | -- | Go to Step 4 | Go to Step 2
4 | Replace the BCM. Refer to Body Control Module Replacement and Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Is the repair complete? | -- | Go to Step 5 | --
5 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | Go to Body Control Module System Check | --