When a semi truck refuses to start, it can bring your route to a grinding halt and cost time and money. In such a situation, our team at Billy Bob’s Repair & Tire can come to you to diagnose and resolve the issue. Here are four common reasons that semi trucks fail to start.

Dead or Weak Battery

One of the most common reasons for a no-start condition in a semi truck is a dead or weak battery. Batteries lose their charge over time, especially in extreme temperatures. Corroded terminals, loose connections, or an aging battery can prevent the electrical system from functioning properly. If the truck makes a clicking noise but won’t start, the battery is a likely suspect.

Faulty Starter Motor

The starter motor is responsible for cranking the engine, and if it’s not functioning properly, the engine won’t turn over. Symptoms of a bad starter motor include a grinding noise, complete silence when turning the key, or intermittent starting issues. Over time, wear and tear can cause the starter to fail, leaving the truck immobile.

Fuel System Problems

Without a steady supply of fuel, a diesel engine can’t start. Common issues include clogged fuel filters, air in the fuel lines, and a faulty fuel pump. Signs of an emerging fuel system issue include inconsistent acceleration, poor fuel-efficiency, and difficult starting. A disruption in the fuel delivery system can prevent combustion, keeping the engine from firing up.

Ignition Switch Issues

If the ignition switch fails, it can prevent the truck from starting even if the battery and starter are in good shape. A worn ignition switch may cut off power to the starter motor and fuel system. Drivers may notice that turning the key doesn't produce any response, which can indicate a failing switch.

24/7 Mobile Semi Truck Repair in San Antonio, TX

For roadside semi truck repair in San Antonio and the surrounding area, contact Billy Bob’s Repair & Tire at (210) 796-3891. We can expertly handle your commercial vehicles’ repair needs. Feel free to give us a call and we’ll arrive ASAP to get you back on the road!