* Reduced power: You'll notice a significant loss of acceleration. The engine may feel sluggish or unresponsive.
* Limited RPM: The engine might not rev past a certain point.
* Altered shifting (automatic transmission): If you have an automatic, the transmission may shift differently, potentially only using lower gears.
* Check Engine Light (CEL): This light will almost certainly be illuminated.
The exact symptoms depend on the specific problem the PCM has detected. It's a crucial warning sign that you need to address the underlying issue. Ignoring it could lead to more serious and costly repairs.
To find out *why* the engine is in failsafe mode, you need to:
1. Check the Check Engine Light: This light will store diagnostic trouble codes (DTCs) in the PCM's memory. You can get these codes read at an auto parts store (many offer free code reading services) or using an OBD-II scanner.
2. Get the codes diagnosed: Once you have the codes, you (or a mechanic) can use them to determine the specific problem causing the failsafe mode. This could range from a simple sensor issue to a more serious mechanical problem.
Do not continue driving extensively while the car is in failsafe mode. It's a temporary solution designed to prevent damage, but driving long distances or pushing the engine could exacerbate the problem. Have it checked as soon as possible.
