What Is Fail-Safe or Limp Mode When My Check Engine Light Is On?

If your check engine light comes on and your vehicle suddenly feels slow, will not accelerate normally or seems stuck in a lower gear, it may have entered fail-safe or “limp” mode. This feature is designed to limit vehicle performance when the computer detects certain problems. For drivers in Anderson, Greenville, Cherrydale, and Mauldin, SC, limp mode is a sign that your vehicle should be diagnosed rather than driven normally.

What Is Limp Mode?

Limp mode is a protective setting used by many modern vehicles. When the vehicle detects a potentially serious engine, transmission or electronic problem, it may limit power, acceleration, engine speed or transmission operation. The goal is to reduce the risk of additional damage and, in some cases, allow you to reach a safe location.

Why Is My Check Engine Light On in Limp Mode?

A check engine light may accompany limp mode because the vehicle’s computer has detected a fault. Problems involving sensors, the throttle system, transmission, engine performance or other components can potentially trigger reduced-power operation. The underlying issue cannot be determined from the warning light alone. A diagnostic scan can retrieve trouble codes and help a technician identify what caused the vehicle to enter limp mode.

Can I Keep Driving With a Check Engine Light On?

Continuing to drive with an unresolved check engine light can allow certain problems to worsen. Depending on the cause, a malfunction may affect fuel economy, emissions, engine performance or your ability to accelerate safely. A flashing check engine light can indicate a more urgent problem and should not be ignored.

If your vehicle has entered limp mode, avoid treating reduced performance as something you can simply drive through. Have the vehicle inspected to determine whether it is safe to continue operating.

Check Engine Light Diagnostics in Upstate South Carolina

If your check engine light is on or your vehicle has entered limp mode, First Class HALT can diagnose the underlying problem and recommend the appropriate repair. Schedule service at one of our locations serving Anderson, Greenville, Cherrydale and Mauldin, South Carolina.