On this Easter morning, I’m hoping that my LR3 gets a resurrection story too… with any ideas you might have to make miracles happen.

Here’s what we’ve got…
2006 LR3 HSE with the HD package
185k miles
GAP IIDTool

Here’s the issue…
It’s got a persistent suspension issue. Presently, it may/may not fault when driving - I haven’t been able to discern its tell. Now, when it faults, ride height lowers immediately and while the vehicle remains drivable from a technical standpoint, it’s certainly not practical. The vehicle has had suspension challenges since I purchased in 2021, but as it has been repaired (at two very reputable Orange County, CA shops), the issues have become increasingly disabling. Details below.

My goal is to determine if there’s another fix to pursue before either selling as is or converting to coils. Both shops have stated that they have no additional ideas on next steps (outside of coils).

Faults:
Steering Angle

• U0300-55 (28) Internal control module software incompatibility - System programming failure - it is not configured

Suspension

• C1A75-1C (28) Rear right height sensor mechanism - General electrical failure - circuit voltage out of range
• C1A07-62 (6C) Cross articulation - Algorithm based failure - signal compare failure
• C1A07-64 (68) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure

Transfer Case

• U0132-86 (28) Lost communication with ride level control module - Busy signal/message failure - signal is invalid

Vehicle Dynamic

• U0132-87 (08) Lost communication with ride level control module - Busy signal/message failure - missing a message
• U0421-68 (08) Invalid data received from ride level control module - Algorithm based failure - event information

Body Control

• B1B02-28 (2F) Low frequency coil - General signal failure - signal bias level is out of range/zero adjustment failure
• B1BA0-66 (6C) Excessive challenge requests or start attempt in storage mode - Algorithm based failure - signal has too many transitions/events
• B1C57-14 (6C) Passive start ignition relay coil circuit - General electrical failure - circuit short to ground or open
• B1D12-15 (2E) Volumetric alarm power circuit - General electrical failure - circuit short to battery or open
• B1D13-15 (2F) Interior lamps 1 circuit - General electrical failure - circuit short to battery or open
• U0155-87 (2E) Lost communication with instrument cluster control module - Bus signal/message failure missing a message

Here’s what we’ve tried…
I purchased the vehicle with Johnson tie rods and a SYA kit installed on OEM bags and sits on factory rims with oversized Toyo Open Country AT3s. All of the below work, with the exception of the installation of the bushings and rear Arnott springs, has been performed by very reputable Land Rover specific automotive shops. I DIY’d the bushings and springs. Handy with tools, but unfamiliar with the intricacies/idiosyncrasies of the Land Rover LR3.

171,850 (2/1/22)

• Rear Driveshaft (new)

172,080 mi (1/9/23)

• Rear Air Suspension Valve Block Solenoid (new)
• Suspension Calibration

Around 177,000 mi (DIY’d)

• All suspension bushings (new)
• Rear Arnott air springs (new)

178,776 (3/15/24)

• Remove SYA from all four corners
• Remove rear Arnott air springs (due to ride quality)
• Rear Air Spring Assembly (OEM) (new)
• Front Air Line (new)
• Front R&L Air Struts (new)

183,538 mi (3/6/35)

• Two days after being repaired for same issue
• Left Front Height Sensor (new)

183,736 (3/17/25)

• Air Suspension Compressor Kit (Arnott) (new)
• Right Front Height Sensor (used)
• Left Rear Height Sensor (used)
• Right Rear Heigh Sensor (used)
• Left Front Height Sensor Connector (used)

184,644 (5/6/25)

• Front Air Suspension Valve Block Solenoid (used)
• Main Air Suspension Valve Block (new)
• Remove fender liner and rock slider on driver’s side to inspect tank for leaks

185,508 (8/14/25)

• Right Front Height Sensor (new)

185,529 (8/16/25)

• Ride Height Calibration

So what next?
Is there anything else that could be causing the persistent suspension issue (randomized suspension faults/lowering to limp)? I’m not too keen on taking it back to a shop at this point since every fix has failed to resolve the issue. I’m willing to put a fair bit of elbow grease in before I throw in the towel. Chasing a ghost? Or what did we miss?
---
Initially, the vehicle would raise/lower/tilt the front end at red lights. Then it graduated to a fault that immediately lowered if the vehicle was driven in excess of an hour or so. But if the vehicle was turned off and then on again, the suspension would refill and it drive normally for another hour or so. Eventually, this cheat would no longer resolve the issue, and that's when suspension repairs begun, to include air struts, lines, compressor, sensors, calibration, removal of most of the lift, etc. At this point, the vehicle starts, runs, drives. However, it's seemingly random as to when it will fault and lower. It may drive 40+ miles in one trip and make a few more that day before the next day will allow only 1.5 miles before it lowers again. As is, it cannot be relied upon to make it anywhere without either calling a tow or carrying two jacks and a friend with you at all times to manually lift the vehicle above the sensors. If this is completed, it will trigger the vehicle to refill and reset. Most outings I haven't budgeted an extra hour plus and a tagalong to ensure the vehicle will be able to make it back to a driveway. And since the shops are out of ideas, I'm turning to you brilliant minds to see what we've missed and give it a last go.

Appreciate your thoughts!

 

Okay, here is what I would do:

1. Remove the Johnson Rods.
2. Clear all faults.
3. Drive it until there is a suspension fault; and then see which faults return.
a. If it's a cross-articulation fault, I'd calibrate the EAS myself with the GAP Tool.
b. If it's a "pressure increasing too slowly" message, I'd replace the compressor.

 

Besides the above, also check the battery
Low voltage/dying battery can cause "lost communications" among other non-issue gremlins

also be aware, something as dumb as 1 tire being lower pressure can cause the "cross articulation" fault

 

Any updates?

I was thinking along the same lines as the other guys.
1. Ditch the lift rods. If you want to lift the truck just do with the IID tool. Lift rods can put the height sensors outside of their normal range, which could maybe be the issue?
2. Put a new battery in it.
3. Always check your live values on IID tool while driving: Compressor temperature, corner height, valve opening states, and gallery pressure are what I look at for an air suspension issue.
4. Maybe a bad ground strap? If you live somewhere with salty roads or other corrosive substances the grounding straps used to complete the circuits in the vehicle can corrode and cause issues. A lot of guys in the UK have trouble with this on the L322s, not sure if it is really a problem on the LR3 or not, but I'd bet it is.