A C0045 engine code appears when brake pressure sensor B is not up to factory specifications. Pressure sensors are crucial for maintaining optimal vehicle safety and performance—and should therefore be inspected immediately.

Diagnostic trouble codes (DTCs) communicate vehicle issues to car owners. An OBD-II code reader can help you understand what each code means, but you’ll usually need a mechanic to diagnose the official problem.

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What does the engine code C0045 mean?

Definition: Faulty brake pressure sensor B

Brake pressure sensors measure the buildup of gasses and liquids in your wheels—informing the vehicle how much braking force to apply. Each wheel has a single sensor.

The C0045 code will appear if sensor B fails. This sensor is located on the rear-right wheel.

How much will it cost to fix?

Like most

car repairs

, you need to consider the cost of parts and labor. To diagnose and replace a faulty brake pressure sensor, you can expect to pay $75 to $150 on labor alone. The price of a new sensor will range from $50 to $250 depending on the model.

What can cause the C0045 engine code?

Often, a C0045 code results from multiple issues with a vehicle's braking sensor. Here are the most common:

Failing sensor

Bad electrical connection between sensor and circuit

If the code is caused by faulty wiring or shorted circuits, a mechanic may fix the problem at a low cost. However, a defective sensor will need a total replacement.

MORE: Does car insurance cover engine failure?

Common symptoms of the C0045 engine code

Since your vehicle's braking system relies on multiple sensors, it can be difficult to pinpoint the issue based on the symptoms associated with a faulty sensor.

A C0045 will result in the following:

ABS warning light on

Check engine light on

How serious is the C0045 engine code?

A C0045 should never be left unchecked. Your braking pressure sensors are needed to apply the correct amount of pressure when engaging the brake. Driving with even one faulty sensor can be extremely dangerous to yourself and others.

Can I fix the C0045 engine code myself?

It’s unlikely that you’ll be able to fix a C0045 code without professional help. To inspect and diagnose your problem, a mechanic will need to remove your vehicle's wheels—which can be a difficult task without the right equipment.

If you attempt to diagnose the problem on your own, you’ll need to inspect the brake pressure sensor for signs of damage, rust, or corroded connector pins.

MORE: My check engine light is on—what does it mean?

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