Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble getting information from the sensor that tells how fast the left back wheel is spinning.
The C1212 code indicates a problem with the electronic monitoring of the left rear wheel speed sensor. This sensor is part of the vehicle's anti-lock braking system (ABS) and traction control system.
The C1212 code is triggered when the Electronic Control Module (ECM) detects an issue with the signal from the left rear wheel speed sensor. This sensor provides data that is crucial for the ABS and traction control systems to function correctly. A faulty sensor or wiring issues can cause this code.
• ABS warning light on
• Traction control warning light on
• Erratic braking behavior
• Faulty left rear wheel speed sensor
• Damaged or corroded wiring or connectors
• Faulty ECM
ECM: Electronic Control Module
ABS: Anti-lock Braking System
• Use an OBD-II scanner to confirm the code.
• Inspect the left rear wheel speed sensor and its wiring for damage.
• Test the sensor's electrical output with a multimeter.
• Replace the left rear wheel speed sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$100 - $300
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Regularly inspect wheel speed sensors for damage.
• Keep the vehicle's undercarriage clean to prevent corrosion.
• Perform regular vehicle maintenance checks.
Sensor Issue
• Do not ignore ABS warning lights.
• Drive cautiously until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on ABS components.
Wheel speed sensor issues have been a common problem as vehicles age, often due to exposure to harsh road conditions.
Moderate – While the vehicle is still drivable, ABS and traction control may not function properly.
Driving with a malfunctioning ABS can increase the risk of accidents, especially in slippery conditions.
• Vehicle stationary
• Ignition on
The left rear wheel speed sensor is located near the left rear wheel hub assembly.
Q: Can I drive with code C1212?
A: You can drive, but be cautious as ABS and traction control may not work properly.
Q: How do I reset the ABS light?
A: Fix the underlying issue first, then clear the code with an OBD-II scanner.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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