TORQDEX // POWERTRAIN DTC
Left Rear Wheel Speed Sensor Circuit
The brake control module has detected a fault involving the left-rear wheel-speed sensor signal or circuit.
00 // CODE DEFINITION
What C0045 means
C0045 is commonly associated with the left-rear wheel-speed sensor circuit.
The sensor, wiring, encoder, bearing, connector, or brake control module input may be involved.
01 // COMMON SYMPTOMS
What you may notice
02 // COMMON CAUSES
What can trigger C0045?
Rear wheel-speed sensor fault
The sensor may be damaged or producing an unreliable signal.
Rear sensor harness fault
Road debris, corrosion, or harness damage can interrupt the signal.
Encoder or bearing issue
A damaged tone ring, magnetic encoder, or wheel bearing can create erratic readings.
03 // DRIVEABILITY
Can I keep driving with C0045?
Use caution. A high-severity fault can affect engine, transmission, electrical, or emissions-system operation. If the vehicle is running poorly, overheating, losing oil pressure, flashing the check-engine light, or entering reduced-power mode, avoid continued driving until the cause is diagnosed.
04 // DIAGNOSTIC ORDER
Start here
Review live wheel-speed data
Compare the left-rear signal with the other wheels.
Inspect sensor wiring
Check connectors and exposed harness sections for damage.
Inspect encoder condition
Look for contamination, damage, corrosion, or excessive bearing movement.
Verify circuit integrity
Test the sensor circuit using the correct procedure for the vehicle.
05 // COMMON REPAIR AREAS
Systems commonly involved
These are common areas associated with C0045. Testing should confirm the actual fault before parts are replaced.
Rear wheel-speed sensor fault
The sensor may be damaged or producing an unreliable signal.
Rear sensor harness fault
Road debris, corrosion, or harness damage can interrupt the signal.
Encoder or bearing issue
A damaged tone ring, magnetic encoder, or wheel bearing can create erratic readings.
06 // DIAGNOSTIC PRINCIPLE
Confirm the fault before replacing parts
C0045 identifies a condition detected by the vehicle control system. It does not automatically identify one failed component. Test the affected system before replacing parts.
07 // RELATED TORQDEX DIAGNOSTICS
Related diagnostic guides
Continue troubleshooting by symptom and system. These TorqDex guides cover common diagnostic paths associated with this trouble code.