Pinpoint Test N: DTC U0131

Anti-Lock Control

Pinpoint Tests

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 is missing for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:

- SCCM.
- ABS module

PINPOINT TEST N: DTC U0131

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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.

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N2 CHECK THE COMMUNICATION NETWORK

- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the SCCM pass the network test?

Yes
GO to N3.

No
REFER to Module Communications Network Testing and Inspection.

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N3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND SCCM SELF-TESTS

- Check for recorded ABS module and PSCM DTCs from the self-test.
- Is DTC B1676 (or B11D9-16) or DTC B11D9-17 recorded?

Yes
For DTC B1676, GO to Pinpoint Test A Pinpoint Test A: DTC B1676. For the SCCM, REFER to Steering System - Electronic Power Assist Steering (EPAS) Testing and Inspection.

No
GO to N4.

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N4 RECHECK THE ABS MODULE DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the ABS module self-test.
- 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.

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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.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0131 set in more than one module?

Yes
INSTALL a new SCCM. CLEAR the DTCs. REPEAT the ABS module self-test.

No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. TEST the system for normal operation.

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