Pinpoint Test BO: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U2016 Control Module Main Software

WARNING: This page is about a different car, the 2023 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When DTC U2016 is set, the PSCM remains in normal operation mode, but features such as Active Nibble Control, Pull-Drift Compensation, Lane Departure Warning, Lane Keep Assist, ect. are disabled.

Normal Operation and Fault Conditions

Description

Description
When the battery voltage to the PSCM is greater than 10 volts with the ignition ON and there are no Diagnostic Trouble Codes (DTCs) present, the PSCM runs a self test of the system software. If an error is detected, a DTC is set and the EPAS enters into a limited operation mode.

Pinpoint Test Applicability

Pinpoint Test Applicability
This test applies to PSCMDTC U2016 Control Module Main Software only. It does not apply to any other module except the PSCM.

DTC Diagnostic Strategy

DTC Diagnostic Strategy
If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).

Pinpoint Test Purpose

Pinpoint Test Purpose
To verify PSCM DTC U2016:xx is present and provide diagnostics if DTC U2016:xx is currently active in the PSCM.

Diagnostic Aids

Diagnostic Aids
During the ignition cycle the DTC U2016 initially sets, the PSCM either enters limp home mode and steering assist is gradually reduced until the PSCM enters manual mode. The PSCM sends a message to the IPC to display
STEERING ASSIST FAULT SERVICE REQUIRED in the message center.

During the next ignition cycle after DTC U2016:47 sets, if the concern is still present, the PSCM removes steering assist and enters manual mode. The module also transmits an invalid steering angle message over the HS-CAN and sends a message to the IPC to display the
STEERING ASSIST FAULT SERVICE REQUIRED in the message center.
When DTC U2016:47 is set, the PSCM remains in normal operation mode, but all steering features; Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.
When DTC U2016:48 is set, the PSCM remains in normal operation mode, but all steering features: Active Nibble Control, Pull-Drift Compensation, Evasive Steering Assist (ESA), Lane Departure Warning (LDW), Lane Keep Assist (LKA) and Lane Centering Assist (LCA) may be disabled.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PSCM U2016:47	Control Module Main Software: Watchdog/Safety μC Failure	Sets due to an internal failure in the PSCM software.
PSCM U2016:48	Control Module Main Software: Supervision Software Failure	Sets due to an internal failure in the PSCM software.

Possible Sources

PSCM internal failure

Visual Inspection and Pre-checks

This DTC sets when the PSCM internal self tests detect a software internal error. Consult the DTC Index for additional information if needed.