U1016 PCM Class II Source ID 10

DTC U1016 PCM Class II Source ID 10 (Part 1 Of 2):

DTC U1016 PCM Class II Source ID 10 (Part 2 Of 2):

CIRCUIT DESCRIPTION
The Body Control Module (BCM) receives a state of health message from the module whose source ID it has learned. If the BCM does not see a state of health message from the Powertrain Control Module (PCM), a DTC code will set.

CONDITIONS FOR SETTING THE DTC
^ The BCM does not receive a state of health message from the PCM after receiving other messages from the PCM.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a DTC U1016 in the BCM memory.
^ No driver warning message will be displayed for this DTC.

CONDITIONS FOR CLEARING THE DTC
^ DTC U1016 will clear as a current DTC U1016 and will set as a history DTC U1016 when the BCM detects a state of health message from the PCM.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.
^ Using a scan tool.

DIAGNOSTIC AIDS
^ The following conditions may cause an intermittent malfunction to occur:
- An intermittent open, short to ground, or short to voltage in circuit 1037 or 1049.
- Poor connections at the BCM, or the PCM.
- An intermittent in Splice Pack SP205.
^ The BCM may store DTC U1016 if certain diagnostics are performed between the PCM and the Data Link Connector (DLC).
^ DTC P1626 will set in the PCM when the ignition switch is in the RUN position with the BCM disconnected.

TEST DESCRIPTION
Numbers below refer to the step numbers on the diagnostic table.
1. Always perform the BCM Diagnostic System Check before attempting to diagnose a DTC U1016.
3. Clears BCM DTCs and checks for BCM DTC U1016 again.
4. Checks if the scan tool tries to communicate with the PCM.
5. Checks for a poor connection at the PCM.
6. Checks if the Splice Pack SP205 is seated properly.
7. Checks for a poor connection at the BCM.
9. Checks the serial data link for an open between the PCM and the BCM.
10. Connects the Splice Pack SP205 properly and tries to communicate with the PCM again.
11. Checks for a poor connection at the Splice Pack.
14. Checks for an open in circuit 1049.