Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.
How to Identify and Fix Common car Problems ?
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Bad Brake Pedal Switch
It signals the brake lights to turn on and also sends a signal to the engine control unit to reduce power, allowing the vehicle to come to a stop. If the brake pedal switch is faulty, it will not send signals to the EPC to reduce the engine power- resulting in an illuminated EPC light.
It sounds like you may have either a blown fuse or a broken wire. Check and replace the fuses/relays as necessary. It may be necessary to check for battery voltage with a digital volt/ohm meter at the brake switch and bulb sockets; be sure to follow the power source power flow chart in the electrical wiring diagram.
When your brake lights are not working but tail lights are, it could indicate a number of issues with your vehicle if the problem isn`t itself with the individual bulb. This could be a smorgasbord of issues from faulty sensors, broken switches to chapped wires, and even electrical problems of the ground.
Malfunctions with fuel metering, timing, or emissions systems. Engine speed sensor failure. Problems with other sensors such as the crank or cam position sensor, mass airflow sensor, and even the brake light switch. Traction control problems.
There are several different causes for an EPC Light to come on. The most common causes are because of a faulty engine sensor, and malfunctions with the air sensor and brake lights. However, there can be many other causes: Wiring issues.
Like all fuses, the brake light system fuse can be found in the power distribution center, which is under the dashboard or tucked away underneath the hood.
The P0504 code is defined as “Brake Switch A/B Correlation” and is a generic diagnostic trouble code (DTC) generated by the engine control module (ECM) of your car. P0504 indicates that the ECM has detected a malfunction in the brake light switch signal circuit (stop lamp or stop light switch circuit).
You can see your brake light switch by looking under the dash, near the top of the brake pedal. The brake light switch is usually attached to a small bracket that holds the switch, activated when the pedal is depressed, in position.
If the lights turn off, the switch is either misaligned or the pedal is in the wrong position. Wire short – You may have a short in the wiring. You can check by unplugging the brake light switch and checking the lights. If they stay on, you have a short circuit somewhere.
If you want to fix the EPC light yourself, you can try the following: first, start the car normally. Then, start the car for the second time and push the gas pedal to the floor when the engine starts. In some cases, this works. It is also a good idea to check the electrical connections on the throttle body.
However, engine oil is crucial to a healthy engine and lubricated parts, so it`s possible an issue that has triggered the EPC light is caused by low oil.
You should never ignore this light when it comes on. It is a clear indicator that there is a problem. The brake control unit, the steering control unit, and the engine control unit all control the EPC. For this reason, it may be challenging to diagnose the cause of the light on your dashboard.
While you can continue to drive with the EPC warning light on, you run the risk of doing significant damage to the engine. To help prevent damage, the EPC`s limp-home mode might activate, making the vehicle sluggish as you seek help.
Using a
25amp Fuse in place of a 30amp Circuit Breaker
Historically auto-resetting circuit breakers have been the standard circuit protection for use with electric trailer brake controllers.
The stop lamp fuse is in the left kick panel inside the vehicle. It is a 15amp fuse that powers the stop light switch on the brake pedal. The brake light switch sends power to rear brake lights.
Failing Brake Systems
Another system that experiences failures that causes illuminated CEL is the brake system. Everything from low fluid levels in the lines to unevenly worn brake pads can cause this light to illuminate.
You should never ignore this light when it comes on. It is a clear indicator that there is a problem. The brake control unit, the steering control unit, and the engine control unit all control the EPC. For this reason, it may be challenging to diagnose the cause of the light on your dashboard.
You should never ignore this light when it comes on. It is a clear indicator that there is a problem. The brake control unit, the steering control unit, and the engine control unit all control the EPC. For this reason, it may be challenging to diagnose the cause of the light on your dashboard.
However, engine oil is crucial to a healthy engine and lubricated parts, so it`s possible an issue that has triggered the EPC light is caused by low oil.