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TECHNICAL BULLETIN
LTB00557NAS2
23 JAN 2014
© Jaguar Land Rover North America, LLC
NOTE: The information in Technical Bulletins is intended for use by trained, professional Technicians with the knowledge, tools, and
equipment required to do the job properly and safely. It informs these Technicians of conditions that may occur on some vehicles, or
provides information that could assist in proper vehicle service. The procedures should not be performed by 'do-it-yourselfers'. If you
are not a Retailer, do not assume that a condition described affects your vehicle. Contact an authorized Land Rover service facility to
determine whether this bulletin applies to a specific vehicle.

This reissue replaces all previous versions. Please destroy all previous versions. Only refer to the electronic
version of this Technical Bulletin in TOPIx.

Changes are highlighted in gray

SECTION: 204-00

Knock Sound From Front Suspension
AFFECTED VEHICLE RANGE:
Range Rover (LG)
Model Year:
2013 Onwards
VIN:
DA000083 Onwards

MARKETS:
NAS

CONDITION SUMMARY:
Situation: A knock sound from the front suspension may be heard inside the vehicle when traveling over an uneven
road surface. The sound may be noticeable, when one of the front wheels travels over a uneven surface while the
opposite front wheel remains on a smooth surface.
Cause: This may be caused by the operation of the Dynamic Response system actuators.
Action: Should a customer express this concern, follow the Diagnostic Procedure outlined below.

PARTS:
NOTE: If required, an allowance of £35.00 (approximately $53.65 US) for the Dynamic Response system
fluid (Texaco cold climate fluid PSF14315 [33270]) and Loctite 243 has been provided and should be claimed
using code 'ZZZ001'.
LR052058

Front Stabilizer Actuator (if required)

Quantity: 1

LR050753

Bolt (M12x55mm) (if required)

Quantity: 4

LR045743

Bolt (M14x55mm) (if required)

Quantity: 2

LR045788

M12 steel Repair Insert (if required)

Quantity: 4

LR043320

M14 Steel Repair Insert (if required)

Quantity: 2

RVW500010

O-Ring Seal (if required)

Quantity: 2

BTR6506

Insulation pad (if required)

Quantity: 1

QYG500090

Bolt - Steering column (M8x30mm) (if required)

Quantity: 1

LR054870

O-ring seal - Air conditioning pipe (if required)

Quantity: 1

TOOLS:
Refer to Workshop Manual for any required special tools.

WARRANTY:

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NOTE: Repair procedures are under constant review, and therefore times are subject to change; those
quoted here must be taken as guidance only. Always refer to TOPIx to obtain the latest repair time.
NOTE: DDW requires the use of causal part numbers. Labor only claims must show the causal part
number with a quantity of zero.
DESCRIPTION

SRO

TIME (HOURS)

CONDITION CODE

CAUSAL PART

Carry out suspension diagnostics

05.11.10

1.0

42

LR046089

Actuator - Renew

60.60.50

1.60

42

LR046089

Fit steel inserts to subframe

60.35.74

2.30

42

LR046089

Strut brace bars - Remove

05.10.40

0.40

42

LR046089

NOTE: Normal Warranty policies and procedures apply.

DIAGNOSTIC PROCEDURE:
BASIC DIAGNOSTIC PROCESS:

1.

NOTE: Use customer supplied occurrence information (speed/road surface/symptom) to
understand what is the most probable root cause of the noises observed.
SYMPTOM: Single 'knock' OR a series of isolated 'knocks':
Drive Cycle / Conditions: Single-wheel and dual-wheel inputs from speed bumps /damaged road surfaces or

similar while traveling ONLY in a forward direction at speeds of up to 25mph (40kmh).
• Action: Perform SERVICE INSTRUCTION 1.

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2. SYMPTOM: 'Knock' noise:
Drive Cycle / Conditions: Noise occurs during

single-wheel inputs (one side only) at speeds up to
12mph (20kmh) when traveling in both a forward

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AND reverse direction. Noise can also be heard during
dual-wheel input but to a lesser extent. Test both
sides of the vehicle independently.
• Action: Refer to Technical Bulletin
LTB00604NAS, Front Air Spring / Damper
Hydraulic Fluid Leak.

3. SYMPTOM: 'Click' noise:
Drive Cycle / Conditions: 'Click' noise occurs during harsh cornering, rapid acceleration, and/or abrupt

braking.
• Action: Refer to Technical Bulletin LTB00618NAS, 'Click' / 'Rattle' Noise From Engine Compartment When
Driving.
• If the issue is not rectified after performing the Service Instruction in this bulletin, remedial work may
be required to the steering rack. Before contacting the Technical HelpLine, raise a Technical Assistance
(TA)request, detailing the following: customer symptoms, road surfaces, and road speeds that create the
noise. After submitting the TA request, the Technical Helpline will advise the remedial actions required.

4. SYMPTOM: 'Rattle' noise:
Drive Cycle / Conditions: Noise occurs while

traveling at speeds up to 20mph (32kmh) over road
surfaces shown.
• Action: Refer to Technical Bulletin
LTB00618NAS, 'Click' / 'Rattle' Noise From
Engine Compartment When Driving.
• If the issue is not rectified after performing
the Service Instruction in this bulletin,
remedial work may be required to the

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steering rack. Before contacting the
Technical HelpLine, raise a Technical
Assistance (TA)request, detailing the
following: customer symptoms, road
surfaces, and road speeds that create the
noise. After submitting the TA request, the
Technical Helpline will advise the remedial
actions required.

5. SYMPTOM: 'Thud' noise:
Drive Cycle / Conditions: Noise occurs while braking abruptly at low vehicle speeds.

• Action: Refer to Technical Bulletin LTB00573NAS, 'Thud' / 'Thump' Noise From Front Suspension On
Brake Application .

SERVICE INSTRUCTION:
1.

NOTE: This Technical Bulletin is written in a specific order where the most likely causes of this issue
are dealt with first. The most likely causes will also give the biggest benefit if addressed. It is therefore
imperative that the steps are followed in order.

NOTE: Refer to TOPIx for all torques not explicitly specified in this document.

NOTE: Replacement of any suspension component which affects suspension geometry must be
followed by conducting a four-wheel alignment check following the procedure highlighted in the vehicle
Workshop Manual.

NOTE: Vehicle Testing: It is important to identify a test route that highlights the customer concern of
suspension knock and re-test the vehicle over the same test route when identified in the following
procedure. The test route should include roads that have a uneven road surface or drain covers that
allow single wheel inputs. The vehicle speed that highlights the issue should be noted during the initial
appraisal of the customer concern and then replicated on subsequent test drives.

NOTE: Typically noise from the Dynamic Response System can be observed at low vehicle speeds
(10–25mph / 16–40 km/h). Some occurrences of hydraulic knock should be expected. Only excessive /

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abnormal knocking noise indicates a concern.
Front Suspension Knock Diagnostic Test: vehicles fitted with the Dynamic Response System are expected to exhibit a
low level of hydraulic knock from the system during normal operation as the input forces are reacted by the Dynamic
Response System. Where there is a customer complaint of excessive / abnormal knocking noise, the following steps
should be taken.

2.

Check and rectify basic faults before beginning diagnostic routines.
Verify the customer concern.
Visually inspect for obvious signs of mechanical damage.
Ensure all tire pressures are set according to the tire label in the driver's door opening.
It is important to identify a test route that highlights the customer concern of suspension knock and re-test the
vehicle over the same test route when identified in the following procedure. The test route should include roads
that have a broken road surface or drain covers that provide numerous single wheel inputs. The vehicle speed
that highlights the issue should be noted during the initial appraisal of the customer concern and then replicated
on subsequent test drives.

NOTE: Disconnecting the Dynamic Response
System fuse is not recommended to help in
diagnosing front suspension knock as it will
change the forcing into the suspension.
Front Suspension Knock Diagnostic Test (refer to step 1)

3. Disconnect electrical connectors from front Adaptive
Damping System shock absorbers.

4. Carry out road test.

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If the noise is still present, refer to the Basic Diagnosis table above as the noise is not likely to be related to the

Dynamic Response system.
If the noise is not present, continue to the next step.

5. Renew the stabilizer drop link if abnormal play is found.
6. Carry out road test: if the concern is rectified, return the vehicle to the customer. If not, then continue to the next
step.
If the issue is not still present, return the vehicle to the customer.
If the issue is still present, continue to the next step.

7. Does the roll bar arm have greater than +/- 10mm of play?
If YES, perform a system bleed.

• Initially only bleed the front Actuator as detailed in TOPIx Workshop Manual section 204-06: Active
Stabilization System Bleeding.
If NO, continue to the next step.

8.

NOTE: Minimum Torque: 190Nm (refer to table
1).
P3 Lower Control Arm to Frame
If the measured torque is less than the minimum

residual torque shown, the fixing should be replaced
with new and torque with reference to TOPIx
Workshop Manual section 204-01: Front Suspension.

9.

NOTE: Minimum Torque: 190Nm (refer to table