Safety comes first
WrenchPulse is an AI-assisted guide to help you understand what your vehicle is doing. It does not replace a physical inspection or a certified mechanic. Read this before working on your car.
What WrenchPulse is — and what it is not
- It is: an educational tool that helps organize symptoms, OBD2 codes, and hypotheses, and suggests tests before you replace parts.
- It is not: a replacement for a certified mechanic or a physical inspection.
- It is not: a guaranteed diagnosis. AI can be wrong, and you should always verify with tests.
- It is not: a source for dangerous work if you lack the experience and proper tools.
Why we recommend tests before replacing parts
Symptoms and OBD2 codes point to a system, not always to a specific part. Replacing parts “blindly” costs money and time, and the problem often comes back because the real cause was something else. That is why WrenchPulse gives you ranked hypotheses and guided tests: confirm first, replace later.
Is the check engine light flashing?
A flashing check engine light (not steady) indicates an active severe misfire that can damage the catalytic converter within minutes. Slow down, avoid heavy acceleration, and find a safe place to pull over as soon as possible. Do not keep driving long distances. An OBD2 reader can confirm which cylinders are affected (P0300–P030x).
System-by-system warnings
Brakes
Do not drive if the pedal feels soft, you hear metal-on-metal, or the vehicle pulls when braking. Brakes require correct torque and proper bleeding; if you lack experience, take it to a professional.
Steering & suspension
Loud noises, play in the steering wheel, or vibration at highway speed are critical signals. Do not drive long distances before an inspection.
Fuel system
Fuel smell, leaks, or damaged hoses are a fire risk. Do not weld, smoke, or operate power tools near the system. Depressurize the fuel system before opening it.
Electrical system
Disconnect the negative terminal before working on wiring. Never bypass fuses with a larger amperage. Mishandled electrical faults can start fires.
Airbags (SRS)
Do not work on the SRS system without specific training. An accidental deployment can cause serious injury. Wait at least the manufacturer-specified time after disconnecting the battery.
Lifting the vehicle
Always use jack stands on firm, level ground. Never rely on the floor jack alone. Do not work under a car held only by a makeshift ramp.
Working under the car
Chock the opposite wheels, put the transmission in Park or in gear, and confirm the vehicle will not move before putting any part of your body underneath.
High voltage (hybrid/EV)
Orange cables are high voltage and can be lethal. Do not touch them. Service only by certified hybrid/EV technicians.
When to stop and call a professional
- Brakes not responding, pedal to the floor, or brake fluid leaking.
- Sudden loss of steering or loud noise when turning.
- Persistent fuel smell or smoke under the hood.
- Overheating with steam from the hood — do not open a hot radiator.
- Flashing check engine light that will not stop after slowing down.
- Any work involving airbags, hybrid/EV high voltage, or welding near the fuel tank.
- When you do not have the correct safety equipment (jack stands, gloves, eye protection).