C1222 Mercury Code - Speed Wheel Mismatch
Quick Answer
The ABS module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. Common causes include Wheels or tires mismatch, Faulty Wheel Speed Sensor, Wheel Speed Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1222 Mercury indicates Speed Wheel Mismatch.
- Common causes
- Common causes include Wheels or tires mismatch, Faulty Wheel Speed Sensor, Wheel Speed Sensor harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code C1222 Mercury Description
The active wheel speed sensor generates a signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage to all of the wheel speed sensors through their circuitry to determine if they are functional.
The ABS module continuously monitors and compares the rotational speed of each wheel and when it detects an impending wheel lock, modulates brake pressure to the appropriate brake caliper. This is accomplished by triggering the hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected wheel returns to normal speed, the ABS module returns the solenoid valves to their normal position and normal (base) braking resumes.
What are the Possible Causes of the DTC C1222 Mercury?
- Wheels or tires mismatch
- Faulty Wheel Speed Sensor
- Wheel Speed Sensor harness is open or shorted
- Wheel Speed Sensor circuit poor electrical connection
How to Fix the DTC C1222 Mercury?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1222 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about C1222 Mercury Code
1. What does the OBDII code C1222 mean on a Mercury vehicle?
C1222 indicates a "Speed Wheel Mismatch," meaning the vehicle's ABS module has detected inconsistent wheel speed readings from one or more wheel speed sensors.
2. What are the common symptoms of the C1222 code in a Mercury?
Symptoms include an illuminated ABS or traction control warning light, reduced traction control or ABS functionality, and, in some cases, uneven braking or handling.
3. What causes the C1222 code to appear on a Mercury?
The code can be caused by a faulty wheel speed sensor, damaged or dirty sensor wiring, mismatched tire sizes, or issues with the ABS module.
4. Can mismatched tire sizes trigger the C1222 code?
Yes, mismatched tire sizes or uneven tire wear can cause inconsistent wheel speed readings, which may trigger the C1222 code.
5. How is the C1222 code diagnosed on a Mercury?
A technician will use a scan tool to confirm the code, inspect the wheel speed sensor and wiring for damage, check the tires for mismatched sizes or wear, and test the ABS module if needed.
6. Can I drive my Mercury with the C1222 code active?
While the vehicle may still be drivable, the ABS and traction control systems may not function properly, which could affect safety in slippery or emergency braking situations.
7. How do you fix the C1222 code on a Mercury?
Repairs may include replacing a faulty wheel speed sensor, repairing damaged wiring, cleaning debris around the sensors, ensuring tire sizes match, or recalibrating the ABS module.
8. How much does it cost to repair the C1222 code on a Mercury?
Repair costs vary but typically range from $100 to $300 for sensor or wiring repairs. ABS module issues or mismatched tires may increase costs.
9. Can dirty wheel speed sensors cause the C1222 code?
Yes, dirt, debris, or corrosion on the wheel speed sensors can interfere with their readings and trigger the C1222 code.
10. Will clearing the C1222 code with a scan tool fix the issue?
Clearing the code may turn off the warning light temporarily, but it won’t resolve the underlying problem. Proper diagnosis and repair are needed to prevent the code from returning.
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