C0045: Left Rear Wheel Speed Sensor Circuit
9 vehicles · 8 makes · $100-$1,500 repair
Most Reported On
C0045 is an OBD-II diagnostic trouble code meaning “Left Rear Wheel Speed Sensor Circuit.” This is a brake/ABS-system code. Each wheel has a speed sensor that tells the anti-lock brake (ABS), traction control, and stability systems how fast that wheel is turning. C0045 means the ABS module has detected an electrical problem in the circuit for the left rear wheel speed sensor — such as an open, short, or signal that's missing or out of range. As a result you'll typically see the ABS and traction/stability warning lights, and those safety features may be temporarily disabled even though your normal brakes still work. This code is most commonly reported on 2000-2007 Ford Focus, 2011-2023 Chrysler 300, and 2014-2023 GMC Sierra 1500, plus 6 other vehicles, with repair costs ranging from $100 to $1,500.
Common Causes
Typical Repair Cost
Based on 10 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose C0045, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (9)
Unwanted ABS Activation Increasing Stopping Distance
StabiliTrak and ABS False Activation from Wheel Speed Sensors
Unwanted Low-Speed ABS Activation (Corrosion) - Recall 05V379
FAQ
What does C0045 mean?
C0045 stands for "Left Rear Wheel Speed Sensor Circuit." This is a brake/ABS-system code. Each wheel has a speed sensor that tells the anti-lock brake (ABS), traction control, and stability systems how fast that wheel is turning. C0045 means the ABS module has detected an electrical problem in the circuit for the left rear wheel speed sensor — such as an open, short, or signal that's missing or out of range. As a result you'll typically see the ABS and traction/stability warning lights, and those safety features may be temporarily disabled even though your normal brakes still work.
What are the most common causes of C0045?
The most common causes of C0045 are: Failed left rear wheel speed sensor, Damaged, corroded or disconnected sensor wiring/connector, Damaged or contaminated tone/reluctor ring (rust, debris, missing teeth), Excessive air gap between sensor and tone ring, Wheel bearing wear affecting the sensor (on bearing-integrated sensors), Water intrusion or corrosion in the connector, Faulty ABS control module (less common). The specific cause varies by vehicle.
How much does it cost to fix C0045?
Repair costs for C0045 range from $100 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by C0045?
Au7o has documented C0045 across 9 vehicle models from 8 manufacturers: Chevrolet, Chrysler, Ford, GMC, Honda, Jeep, Kia, Nissan.
Sources (12)
- videoYouTube Repair Video: Rear Wheel Bearing Replacement on Ford Focus
- NHTSANHTSA RCSB-19V645: Product Safety Recall N192268490 Increased Brake Pedal Effort
- NHTSANHTSA RMISC-20V055: Frequently Asked Questions for NonCompliance Recall N192268091
- mediaLemon Law Aid: 2019 Chevy Silverado & GMC Sierra Electronic Brake Module Recall
- mediaConsumer Reports: Chevrolet Silverado and GMC Sierra Pickups Recalled Again for Brake System
- RecallNHTSA Recall 20V123000 - Nissan 370Z Brake Actuator Relay Issue
- TSBNissan Technical Service Bulletin NTB14-041: Brake Actuator Relay Replacement Procedure
- NHTSANHTSA Complaints - Avalanche ABS Issues
- NHTSANHTSA Safety Recall SC284UB HECU Fuse Replacement
- ForumRecall for HECU - Kia Optima Forums
- ForumInterim Notice Safety Recall - Kia Forum
- Forumr/JeepGrandWagoneer subreddit - owner discussions including ABS/ESC warning light and wheel speed sensor issues
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.