Why does the gearbox get stuck in one gear?

This "limp mode" is often a deliberate safety response when this module detects a serious fault, defaulting to a single safe gear to protect the transmission from further damage while still allowing the vehicle to be driven to safety.

Is it dangerous to keep driving with this module faulty?

Erratic or harsh shifting affects vehicle control and should be addressed promptly — if in limp mode, drive cautiously and have it diagnosed as soon as possible.

Does this module need calibration after replacement?

Yes, typically an adaptation procedure matched to the specific gearbox type is needed for it to relearn optimal shift points with the new module.

What is this part and what does it do?

Full description available in the product description section above. Contact us with clarifying questions.

How do I tell if my part is faulty?

See the 'Signs of a faulty part' section above or run a diagnostic at an auto service.

Yes - all our used parts are tested before sale and sold with guaranteed quality.

When should the part be replaced?

When warning signals appear, diagnostic codes are present, or the system malfunctions.

Transmission control unit RANGE ROVER SPORT 2007

Name: Transmission control unit RANGE ROVER SPORT 2007
Brand: RANGE ROVER
SKU: CKL7A NNW508480 1137328137
Price: 63.00 EUR
Availability: InStock

OEM: CKL7A NNW508480 1137328137

Disassembled car photo

Engine running

Tested before shipping
Guaranteed quality
Fast delivery 3–7 days
14-day returns

What is this part and why does it matter?

This control unit is built specifically for manual automated or robotized gearboxes (as opposed to a conventional automatic transmission), managing that gearbox type's distinct shift logic.

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Not sure about compatibility? Send us your car's VIN and we'll confirm.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

Harsh, delayed, or erratic gear shifts
Gearbox warning light on the dashboard
Transmission stuck in one gear (limp mode)

Installation information

Mounted on or near the gearbox, connecting to the transmission wiring harness — requires specialist adaptation/calibration matched to the gearbox type after replacement.

Donor vehicle description

VIN: SALLSAA147A103944
Make, model: RANGE ROVER SPORT
Year: 2007
Engine: Lion diesel 2.7 V6 140 kW
Transmission: 6-pārnesumu Automatiska. ZF 6HP26Steptronic
Drive: 4WD
: Stūre kreisajā pusē
Colour: Stornoway Gray (907)

302 parts from this car

Frequently asked questions

It's calibrated for the distinct shift logic of a manual automated or robotized gearbox, which works differently from a conventional torque-converter automatic.

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September 2026
Price: excellent.
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August 2026
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August 2026
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Toyota Avensis
August 2026
No complaints about Evro Trans itself, everything's fine. But the delivery..... It felt like the order was being carried by turtles. 4 days from Riga to Daugavpils. Judging by the tracking, the parcel just sat somewhere behind a shed for 3 days, then they found it and delivered it the next day. I think that's why I won't be ordering there again.
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June 2026
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May 2026
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February 2026
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November 2025
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Front fender
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