How is fault code C0045 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Plug in a scanner and read the lot, not just C0045. If you've also got a hub-bearing rumble or other wheel codes, that points you at the tone ring rather than the sensor 2. Get the car up on a ramp or axle stands and eyeball the left rear sensor, the cable run, and the connector. You're hunting for green corrosion, split insulation, or a connector full of water 3. Unplug the sensor and measure its resistance against the workshop figure. Most are passive sensors reading somewhere around 1k to 2k ohms; open or shorted means a dead sensor 4. Check the tone ring by slowly turning the wheel by hand and watching live data, or just inspect it for rust, cracks, or missing teeth. A flatlining signal with a good sensor usually means the ring 5. Spin the wheel and watch the left rear speed in live data against the other three. Drops to zero or spikes that don't match the others confirm where the fault sits 6. Clear the codes and road test. Take it up to a steady speed and brake a few times so the

Left Rear Wheel Speed Sensor

Jump to the fix

Severity

High

Can I keep driving?

Avoid extended driving; visit a service soon.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Plug in a scanner and read the lot, not just C0045. If you've also got a hub-bearing rumble or other wheel codes, that points you at the tone ring rather than the sensor 2. Get the car up on a ramp or axle stands and eyeball the left rear sensor, the cable run, and the connector.

CChassis
0Generic code
0Chassis / ABS
45Sequence number

What does it mean?

C0045 is a Chassis (ABS, traction control, steering) fault code. It indicates: Left Rear Wheel Speed Sensor Circuit . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

Related Similar Codes

This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.