Pinpoint Test N: DTC U0131

Anti-Lock Control

Pinpoint Test N: DTC U0131

Normal Operation

- NOTE: Vehicles with a 6.2L engine are equipped with a Steering Column Control Module (SCCM).

DTC U0131 (Lost Communication With Power Steering Control Module (VAPS)- this DTC sets in continuous memory and on-demand if the steering sensor message that should be received from the SCCM (Steering Column Control Module) is missing for 5 seconds or longer.


This pinpoint test is intended to diagnose the following:

- SCCM (Steering Column Control Module).

- ABS module

PINPOINT TEST N : DTC U0131

N1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to N2.
No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

N2 CHECK THE COMMUNICATION NETWORK

- Using a scan tool, carry out a Network Test.

Does the SCCM (Steering Column Control Module) pass the network test?

Yes
GO to N3.
No
REFER to Information Bus.

N3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND SCCM (Steering Column Control Module) SELF-TESTS

- Enter the following diagnostic mode on the scan tool: Self Test- ABS Module.

- Enter the following diagnostic mode on the scan tool: Self Test- SCCM (Steering Column Control Module).

Is DTC B1676 (or B11D9:16) or DTC B11D9:17 recorded?

Yes
For ABS module DTC B1676, GO to Pinpoint Test A. Pinpoint Test A: DTC B1676

For SCCM (Steering Column Control Module) DTCs, REFER to Steering Column.
No
GO to N4.

N4 RECHECK THE ABS MODULE DTCs

- Clear the DTCs.

- Ignition OFF.

- Wait 10 seconds.

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self Test- ABS Module.

Is DTC U0131 still present?

Yes
GO to N5.
No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

N5 CHECK FOR DTC U0131 SET IN OTHER MODULES

- Clear the DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is DTC U0131 set in more than 1 module?

Yes
INSTALL a new SCCM (Steering Column Control Module). CLEAR the DTCs. REPEAT the ABS module self-test.
No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.