DTC P1602 Loss of EBTCM Serial Data. Cadillac Concours 1997

For 1990-2009 cars

### Circuit Description

This diagnostic test checks for absent or invalid Electronic Brake and Traction Control Module (EBTCM) serial data to the PCM. When such a condition exists for 11 seconds, DTC P1602 is set.

### Conditions for Setting the DTC

#### Test Conditions

• | DTC P0322 not set.

• | Engine speed 500 RPM or more for 10 seconds.

#### Failure Condition

Invalid or no serial data from the EBTCM to the PCM for 11 seconds.

### Action Taken When the DTC Sets

• | The Malfunction Indicator Lamp (MIL) will not illuminate.

• | No message will be displayed.

### Conditions for Clearing the DTC

• | A History DTC will clear after forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.

• | A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.

• | Use a scan tool to clear DTCs.

• | Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to EBTCM System Check | Go to A Powertrain On Board Diagnostic (OBD) System Check