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What does gearbox fault mean on a Range Rover? An error message with “gearbox fault” on a Range Rover is usually an error or malfunction within the Range Rover’s transmission system. There are several symptoms, such as difficulty shifting gears, slipping gears, or not moving. Common causes include low transmission fluid levels, worn transmission components, or sensor issues.
As an experienced Range Rover owner, I’ve had my fair share of troubles with my vehicle. One issue that I have dealt with in the past is a gearbox fault error code. This can be a frustrating and potentially costly problem to fix, but with the right knowledge and resources, it can be dealt with effectively.
In this article, I’ll be discussing the key overview of the gearbox fault error code, the signs and symptoms of this issue, the possible OBD codes that may appear, common causes, and whether or not it can be fixed without a mechanic.
I’ll also provide a list of the parts and tools you’ll need to fix the problem, as well as a step-by-step guide on how to fix it.
Additionally, I’ll cover potential alternative causes that may have caused your Range Rover to throw up a “gearbox fault” error on your dashboard.
What models are affected?
- Land Rover Defender
- Range Rover Discovery
- Range Rover Evoque
- Range Rover Sport
- Range Rover Velar
- Range Rover Vogue
What are the symptoms of a faulty gearbox?
- Warning message or light on dashboard indicating “gearbox fault.”
- Difficulty shifting gears or clunking noise when shifting.
- Loss of power or difficulty accelerating.
- Jerking or slipping of gears.
List of possible OBD codes
- P0700: Transmission Control System Malfunction
- P0730: Incorrect Gear Ratio
- P0731: Gear 1 Incorrect Ratio
- P0732: Gear 2 Incorrect Ratio
- P0733: Gear 3 Incorrect Ratio
- P0734: Gear 4 Incorrect Ratio
- P0735: Gear 5 Incorrect Ratio
- P0736: Reverse Incorrect Ratio
Common causes of a faulty gearbox
- Low fluid levels in the transmission or gearbox.
- Worn-out or damaged gears, bearings, or other internal parts.
- Electrical issues such as a failed control module or sensor.
- Clogged or restricted transmission oil cooler.
- Overheating of the transmission due to lack of cooling.
Can it be fixed without a mechanic?
Some issues, such as low fluid levels or clogged transmission oil coolers, can be fixed by the owner with the proper tools and knowledge of working around a Range Rover is essential.
Other issues, such as internal damage or electrical problems, will likely require the expertise of a professional mechanic.
Parts you’ll need
- Transmission or gearbox oil.
- Oil filter.
- Transmission oil cooler.
- Gears, bearings, or other internal transmission parts (if necessary).
Tools you’ll need
- Transmission fluid pump.
- Wrench set.
- Socket set.
- Torque wrench.
- Transmission jack (if removing transmission).
How to fix it
- Check fluid levels and add or change the fluid as necessary.
- Clean or replace the transmission oil cooler.
- Inspect and replace any worn or damaged internal parts.
- Inspect and repair any electrical issues.
Potential other causes
Failed automatic transmission control module (ATCM)
The ATCM is responsible for controlling the gear shifting in the transmission. If it fails, it may cause a gearbox fault code to appear on the dashboard and result in issues with shifting gears or difficulty starting the vehicle.
A damaged or corroded wiring harness can cause many headaches and issues, including a gearbox fault. This may be caused by exposure to water or other elements and can cause poor electrical connections within the transmission.
Low fluid level
The transmission relies on a certain level of fluid to operate properly. If the fluid level is low, it can result in poor shifting and a gearbox fault code.
Clogged transmission filter
A clogged transmission filter can restrict the flow of transmission fluid and cause the transmission to overheat, resulting in a gearbox fault.
Failed torque converter
The torque converter is responsible for converting the engine’s power into the transmission’s power. If it fails, it can cause shifting issues and a gearbox fault code.
It is important to note that a gearbox fault can have multiple causes, and it is best to have a professional diagnose the issue and determine the proper course of action.
So, what does a gearbox fault on a Range Rover mean? It can be indicated by several signs and symptoms, including the gearbox warning light appearing on the dashboard, difficulty shifting gears, and strange noises coming from the transmission. Common OBD codes associated with a gearbox fault include P0700, P0715, P0720, and P0730.
The most common cause of a gearbox fault is a failure in the transmission control module, but issues with the transmission fluid, the gearbox sensor, or the solenoids can also cause it. While some minor fixes can be done without a mechanic, it is generally recommended to take your Range Rover to a professional for diagnosis and repair.
Potential alternative causes of a gearbox fault include problems with the clutch, flywheel, or driveshaft. It’s important to have a regular check-up of your vehicle and not ignore the warning signs of a gearbox fault to avoid any major repairs.
Last updated and verified on 4th September 2023