PCM vs ECM vs ECU vs TCM (What’s the Difference?)

PCM vs ECM vs ECU vs TCM

Before vehicle computers were invented, cars and trucks used a system of mechanical and pneumatic devices to manage systems such as valve timing and idle speed.  Now, modern vehicles have a complex system of sensors and actuators connected to computers which enable the vehicles to perform well and efficiently. These electronics are confusing enough without … Read more

6 Symptoms of Bad Spark Plugs (and Replacement Cost)

bad spark plugs

Spark plugs are crucial components to an internal combustion engine. Without them, there would be nothing to ignite fuel within the combustion chamber. It’s no surprise that dirty or fouled spark plugs are a common cause for many engine issues. Here you’ll learn how a spark plug works as well as common symptoms of a … Read more

7 Symptoms of a Bad MAP Sensor (and Replacement Cost)

bad map sensor symptoms

A MAP sensor, or manifold absolute pressure sensor, is a type of engine sensor that measures the amount of air pressure present in a vehicle’s intake manifold. This pressure reading is used along with engine speed (measured in revolutions per minute, or RPM) to determine engine load, which allows the vehicle’s engine control unit (ECU) … Read more

6 Symptoms of a Bad PCM (and Replacement Cost)

bad PCM symptoms

The Powertrain Control Module (PCM) is a sophisticated piece of machinery. It receives data from a range of sensors. The Engine Control Module (ECM) and the Transmission Control Module (TCM) are both examples of systems that the PCM monitors. Remarkably, the PCM also analyzes the data it collects. It uses that information to control the … Read more

8 Symptoms of a Bad Voltage Regulator (and Replacement Cost)

bad voltage regulator symptoms

With a vehicle, there’s a lot of power under the hood. We’re not talking strictly about horsepower, but rather energy output in general. The energy that the car needs is supplied by the fuel and by the battery. You need plenty of power to keep the engine running. For smaller systems in the vehicle, you … Read more

5 Symptoms of a Bad ECU (and Replacement Cost)

bad ECU symptoms

The engine control unit (ECU), also referred to as the engine control module (ECM), is an electronic module that controls the function of the engine. This is done through a series of electronic components and sensors which compute data back to the engine. Based on what this data indicates, the engine will perform a specific … Read more

9 Causes of a Car Battery Light On While Driving

car battery light on while driving

When driving, it’s always important to pay attention to the signals your car is sending you. Many of these can be seen as glowing little symbols on the dashboard. But what should you do if the battery warning light comes on? Most modern vehicles have a 12 volt battery. Electric vehicles usually have one of … Read more