YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. If the brake lights are working properly, but the code persists, mechanics will heck the remaining wires on the brake light switch and then remove the connector to probe the wires for power. Must be due to the weight some how. If there is an underlying problem with the brake switch or circuit, replacing a blown brake fuse may also be a mistake, as the root problem will likely cause the fuse to blow again. What causes the P0504 code? The code is still there. A blown or malfunctioning brake light fuse 2. Additional comments for consideration regarding the P0504 code In addition to causing potentially dangerous situations on the road, a P0504 code can also result in a failed emissions test.
One or both remain on, even after taking your foot off of the brake pedal. Common Causes The most common cause of this malfunction is a blown brake lamp fuse. Which means it must be replaced. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. How does a mechanic diagnose the P0504 code? Look at the plug wires to make sure they are not burnt or laying on the exhaust. Pulled my boat down to the coast and stopped for ice. Disconnect the connector off of the switch.
So I tested my brake lights; work just fine. Following traffic cannot tell if you intend to slow down or if you need to stop suddenly, and an accident can easily occur. I had the same issue. They will start with the brake light fuse and test the brake light bulb. If there is little to no voltage, then the harness that connects the computer to the switch must be repaired or replaced. The brake reservoir is filled properly and there are no obvious brake issues though I haven't yet looked at the pads.
This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Metric Deep Socket Set Needle Nose Pliers: 12 pc. I crawled under my dash, disconnected the brake light switch, left it for about 5 minutes, then plugged it back in. If you have no voltage then remove the connector and run a small jumper wire between the red wire and the white wire. Thus you can see that the P0504 code is very serious, and should be dealt with immediately. Everything you see that I was installing back in the end of the video was what he removed to get to the switch. Turned truck off for a couple of minutes and turned back on and the lights went away and resumed my travels.
What repairs can fix the P0504 code? If it doesn't, I'm out of ideas for my limited mechanical knowledge. No bulbs out, no brake lights on when not supposed to be. I pulled some fuses that may have been linked to the brake system. The shift interlock system fails to work properly. How to Fix Depending on the root of the problem, diagnosis and repairs for this code are mostly straightforward. Following traffic cannot tell if you intend to slow down or if you need to stop suddenly, and an accident can easily occur. What repairs can fix the P0504 code? Reconnect to the switch and while pressing the brake pedal, check for voltage at a white wire.
I tested my cruise control; works just fine. Anyone ever had this problem? Check for damage to the wiring harness connector. Please subscribe and thank you for watching. Check out The Flat Rate Mechanics Tool Store on Amazon Subscribe to my youtube channel here: Connect with me: FaceBook: Twitter: Instagram: Google Plus: Website: For Promotional offers, consulting, training, sponsorships or other inquiries contact me at FlatRateMechanic1 gmail. Replacing a blown brake light fuse. I disconnected the brake light switch.
The Engine Control Module analyzes these signal outputs to detect malfunctions in the stop lamp switch. How serious is the P0504 code? Common mistakes when diagnosing the P0504 code Often, when a does not turn on when the driver depresses the brake pedal, they will assume that the problem is a burnt out bulb. Code Set Parameters The brake switch controls brake light activation, cruise control deactivation, and shift interlock functions. They will start by testing the brake light fuse, and then they will test and replace the brake light bulb. If these measures do not fix the problem, they will move on to test the itself, as well as its wiring and connectors.
Defective or damaged brake light bulbs are replaced. I guess I will order a new brake light switch, and see if that solves it. Symptoms The cruise control system may fail to engage or disengage when the brake pedal is depressed, the brake lamps on the rear of the vehicle may either remain illuminated or fail to illuminate, the shift interlock system may fail to operate properly, or the engine may stall when the brakes are depressed at highway speeds. Mine initially happened hauling a massive load of firewood. What are the symptoms of the P0504 code? If these measures do not fix the problem, they will move on to test the itself, as well as its wiring and connectors. Replacing wires or connectors for the.
Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another. Thought it might have had something to do with the trailer lights. Common Misdiagnosis Brake lamp bulbs are often replaced in an unsuccessful attempt to repair this condition. What the P0504 code means If a failure occurs in the circuit for the brake light, a number of problems can occur. Then have verified that the switch needs to be replaced. Get a digital multimeter to test voltage and jump wire.
Brake lights are working as they should. This is a safety factor that demands immediate repair. Depressing the brake pedal at highway speeds causes the engine to stall. However, I went to Autozone today and had them scan it. P0504 Description In addition to turning on the stop lamp, the stop lamp switch signals are used for a variety of engine, transmission, and suspension functions as well as being an input for diagnostic checks.