NHTSA ID Number: 10245032
Manufacturer Communication Number: SSM76104
TSB/Document Date: 2023-11-07
Summary
No Power Steering Assistance at Start of Drive Cycle – ADAS Warning
Reference
SSM76104
Models
Defender / L663
Discovery / L462
New Range Rover / L460
New Range Rover Sport / L461
Title
No Power Steering Assistance at Start of Drive Cycle – ADAS Warning / DTC U0400-81
Category
Chassis
Last modified
20-Oct-2023 00:00:00
Symptom
303000 Steering/Handling
Content
Model / Model Year / Derivative
Range Rover / 22MY onwards / All
Range Rover Sport / 23MY onwards / All
Discovery / 21MY onwards / All
Defender / 20MY onwards / All
Situation:
JLR Engineering investigations have had reports of no power steering assistance at the start of a drive
cycle.
Advanced Driver Assistance Systems (ADAS) warning message on the Instrument Panel (IP) and
Diagnostic Trouble Code (DTC) U0400-81 is set on the Driver Assistance Domain Controller (DADC).
Cause:
Software error.
Action:
Follow the instruction(s) below.
SERVICE INSTRUCTION:
If the symptoms match those in the situation section, Do Not replace any parts before completing the
following steps:
1. Run the Network Integrity Test (NIT) vehicle application.
2. Run the Power Steering Control Module (PSCM) data collection module application.
3. Complete the 12V battery reset procedure below:
Disconnect and reconnect the 12V battery – (see TOPIx Workshop Manual section: 414-00 - BATTERY
AND CHARGING SYSTEM - GENERAL INFORMATION - 12V SYSTEM DISCONNECT AND
CONNECT).
4. Confirm that the customer reported fault is now resolved. If the vehicle fault is not resolved, continue
diagnosis using TOPIx support.
Note: A software update will be available in the future as a permanent repair. This SSM will be updated
when software is available along with a TOPIx Workflow Test Plan available through ‘Fault and
Breakdown -> Diagnose a Fault’.
(Ref 000370222)
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TSB/Document ID: SSM76104
Replacement Service Bulletin Number:
MFR Communication Date: 2023-10-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STEERING
MFR Component System:
MFR Component Subsystem:
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