Limp Mode

Limp Mode

What is Limp Mode?

Limp mode is a safety function when the car computer detects a serious malfunction of some sort. It feels like you driving with the brake on, or something is holding you back. Your car is generally stuck in one gear and a loss of power. Limp mode can occur with most modern vehicles with a computer controlling the components of your vehicle.

First sign your car is in limp mode

Your engine light comes on, on the dash. When this warning light comes on suddenly there is something wrong with your engine. If you are driving an automatic and your transmission suddenly shifts to 2nd or 3rd gear and stays in this position, you are most probably in limp mode.

What Causes Limp Mode?

While the specific cause varies by vehicle, here are the most common triggers for limp mode:

• Transmission Problems: Faulty sensors, overheating, or low transmission fluid.

• Engine Issues: Misfires, overheating, or low oil pressure.

• Sensor Failures: Faulty throttle position sensor, mass airflow sensor (MAF), or oxygen sensor.

• Turbocharger Problems: Boost pressure issues or turbo failure.

• Electrical Faults: Wiring issues, blown fuses, or a failing battery.

• Exhaust System Problems: Clogged DPF or EGR valve issues (common in diesel vehicles).

• Software Glitches: Outdated or corrupted ECU software.

What signals are sent to the computer?

Usually faulty engine sensors/components/wiring, transmission issues, dysfunctional brakes and clutch, a wire needs to be reconnected, or even low fluid levels.

Check engine light – problem with transmission wiring
Rev Limit 2500-4000rpm – Malfunction engine boost control
Under-boost – Defective ehgine components
Low performance – Engine sensors faulty
Restricted functions – Problem with brake system
Transmission Max 3rd gear – Faulty engine wiring

What to Do If Your Car Goes into Limp Mode

1. Stay Calm and Drive Safely: Limp mode limits your speed, so avoid aggressive driving and find a safe place to stop.

2. Check for Obvious Issues: Look for warning lights on the dashboard or unusual noises.

3. Restart the Car: Sometimes, turning the car off and on again can reset the system.

4. Visit a Mechanic: Use a diagnostic tool to read error codes and identify the root cause. A professional mechanic can repair the issue and reset the system.

If you can shift your car into any gear then you are able to drive your car. Sometimes this is all it takes and your car will be fine. But if the problem persists and happens frequently then we suggest you take your car to your closest workshop and have them run diagnostics on the car to find  the fault.

Is limp mode dangerous?

Often the vehicle will not have any serious effects when going into limp mode, but we cannot stress to you that it can also be serious. (Depending on the age of the vehicle and how often the vehicle goes into limp mode). Therefore we suggest you take no chances and rather get a professional to give your car a once over for peace of mind motoring.

If your transmission is in limp mode, your transmission has a problem and you should get it fixed as soon as possible. … It is advised that you do not continue to drive a vehicle in limp mode as it is unsafe and can cause further damage to your vehicle.

Preventing Limp Mode

• Regularly service your vehicle, including oil changes, filter replacements, and transmission checks.

• Address warning lights or unusual symptoms immediately.

• Keep your car’s software updated (if applicable).

• Avoid overloading or overworking your vehicle, especially in extreme conditions.