What is the reason for the car's P light being on?

[AdamMarie]

The reasons for the car's P light being on are: 1. Not releasing the handbrake when starting; 2. Severe wear of brake pads; 3. Insufficient brake fluid; 4. Short circuit in the handbrake connection line; 5. Computer self-check. The solutions for the car's P light being on are: 1. Release the handbrake when starting; 2. Replace the brake pads; 3. Add brake fluid; 4. Check the handbrake wiring. The car's indicator lights and their functions are: 1. Battery indicator light: Battery drained or generator failure; 2. Water temperature warning light: Overheating of water temperature; 3. Tire pressure warning light: Abnormal tire pressure; 4. ABS fault warning light: Anti-lock braking system failure.

[GabrielleFitz]

I've been driving for over a decade, and that P light on the dashboard usually indicates a problem with the parking brake system. The most common issue is the handbrake not being fully released, especially easy to overlook when driving on mountain roads; or the brake fluid level being too low, triggering the warning light. Once when I was on a long trip, the light suddenly started flashing. I got out to check and found the fluid reservoir was almost empty—topping it up fixed the issue. If the light stays on despite normal fluid levels, it could be a sensor malfunction or a loose electrical connection. Pull over temporarily to check, don't force it—safety is crucial. It's dangerous if the car rolls on a slope. Best to find level ground, engage the handbrake, and if you can't diagnose it yourself, head to a repair shop promptly.

[DeCarter]

When the P light illuminates on my car, I immediately become alert as it relates to driving safety. The light indicates a risk of parking system failure, such as a stuck handbrake or an electronic module malfunction. If this occurs, the vehicle may not remain stably parked, especially on slopes, which is highly dangerous. I usually pull over, manually tighten the handbrake to confirm its position, and then open the hood to check the brake fluid reservoir level. If the fluid level is too low, it needs topping up; if there are no issues, it might be due to aging wiring or a faulty control unit. Ignoring it can easily escalate into brake failure, so don’t hesitate—seek professional repair promptly.

[LeviLynn]

The main reasons for the P light to illuminate are: the handbrake not being fully released, insufficient brake fluid, or poor sensor contact. In electronic parking systems, a module malfunction can also trigger a false alarm. When dealing with similar issues, I usually first push the handbrake lever to ensure it's properly engaged, then quickly check the fluid level. If the light remains on, I inspect for loose wiring connections. Regular maintenance checks on these components can prevent major issues.