TD5 Won’t Start? Fix Crank Signal Faults with a Proper Overlay Harness
If your Land Rover Defender TD5 or Discovery 2 TD5 won’t start, especially when hot, you’re not alone. Crank no start issues are one of the most frustrating and common problems TD5 owners face. You might crank and crank but the engine never fires. Or maybe it runs when cold but refuses to start when warm.
If you’ve searched “TD5 crankshaft position sensor fault”, “TD5 starting issue”, or “crank signal noisy”, you’re in the right place. The cause is almost always the same and we’ve got the right solution.
Why Your TD5 Won’t Start: Crank Signal Issues Explained
The TD5 engine relies on a clean signal from the crankshaft position sensor CKP to fire injectors and manage timing. Without this signal, the ECU won’t inject fuel, and your engine simply won’t start.
Common Symptoms of Crank Signal Failure:
TD5 cranks but doesn’t start hot or cold
Engine cuts out while driving
Hot start failure after short stops
Rough idle or poor running at low RPMs
CKP fault codes on Nanocom or diagnostics
Crank signal implausible warnings
Noisy waveform on diagnostic scope
While many assume the sensor is at fault, the real culprit is often the wiring between the sensor and ECU damaged, degraded, or poorly shielded over time.
The Real Problem: Crank Sensor Wiring Breakdown
The factory crank sensor wiring runs close to the starter motor, turbo, and chassis, exposing it to:
High heat
Oil contamination
Constant vibration
This harsh environment causes the shielding and insulation to degrade, allowing electrical interference and voltage drops. The result is a noisy crank signal, which confuses the ECU and causes intermittent no start conditions.
The Right Fix: TD5 Crank Sensor Overlay Harness
You could replace the full engine loom but that’s expensive and unnecessary in most cases. A better, proven solution is a crank position sensor overlay harness.
What Is an Overlay Harness
It’s a custom built shielded cable that bypasses the faulty factory wire and runs a clean direct line from the crank sensor to the ECU.
But be cautious. Not every overlay kit is designed for long term reliability.
Not All Kits Are Created Equal
There are many aftermarket harnesses sold as quick fixes but some fall short where it matters most.
Common Issues with Inferior Harnesses
Inadequate shielding means signal noise persists
Flimsy connectors prone to vibration and corrosion
No waterproof protection at the ECU end
Wire not rated for engine bay heat or oil
Short lifespan with failures often returning within months
These products can seem appealing due to their low cost but they often provide only temporary relief and make future diagnostics harder when issues return.
Empire Tuning TD5 Overlay Harness: Built to Last
We engineered our TD5 Crankshaft Position Sensor Overlay Harness to be a permanent fix with no shortcuts and no compromises.
Key Features
Full EMI shielding filters out signal noise
OEM spec connectors for perfect fit to TD5 sensor and ECU
Waterproof plugs for reliable performance in all conditions
Heat and oil resistant wire made for engine bay abuse
Plug and play install with no splicing or soldering
Individually tested before shipping
Whether you’re overlanding or just commuting this is a fit it once forget it solution.
Trusted by TD5 Owners and Workshops Worldwide – Worldwide Shipping Available
Over hundreds of units sold our overlay harness has delivered consistent reliable fixes for:
Hot start failure
Crank no start after engine warm up
CKP fault codes
Noisy crank signals on scope or Nanocom
Used by expedition builders, off roaders, and daily drivers, it’s a proven upgrade for any TD5 with crank signal issues.
When to Install a TD5 Crank Signal Overlay
You should install an overlay harness if:
Your TD5 cranks but won’t start
You’re seeing CKP signal errors
You experience cutting out while driving
You’ve replaced the sensor but problems continue
Your diagnostic tool shows a noisy crank signal
If the sensor is new and the issue persists it’s the wiring every time.
Don’t Let Cheap Parts Cost You More
Spending less upfront can cost more in the long run. Here’s what “cheap” really costs:
Time wasted chasing recurring faults
Labour for repeated sensor swaps
Recovery costs if stranded
Lost trust if you’re a workshop
Buy once. Fix it properly. End the problem for good.
FAQ: TD5 Crank Sensor Faults
Q: My TD5 cranks but won’t start. Could it be the crank sensor
A: Likely. If the ECU doesn’t see a crank signal it disables fuelling completely.
Q: I replaced the sensor but still get crankshaft signal implausible errors. Why
A: That’s nearly always caused by damaged wiring or shielding not the sensor.
Q: Does this harness fit both Defender and Discovery 2 TD5
A: Yes. It’s fully compatible with all TD5 models using the standard CKP sensor.
Q: I tried a low cost harness and it worked briefly but the issue returned
A: That’s common. Many kits lack proper shielding or durability for long term use.
Order Now – Solve Your TD5 Starting Problem
Don’t wait for your TD5 to leave you stranded. Our Empire Tuning TD5 Crank Position Sensor Overlay Harness is built for reliability performance and peace of mind.
👉 Order Here – TD5 Overlay Harness – Empire Tuning
Got questions about installation or symptoms
Message us we’re happy to help you get your TD5 running strong again.
