AutoCodes – Mercury – C1148 Mercury

C1148 Mercury Code - Speed Wheel Sensor RF Coherency Fault

Quick Answer

When the driver stops too fast, and one or more wheels begin to lock up, the ABS system takes over. Common causes include ABS RF Wheel Speed Sensor / Wiring intermittently open/shorted, Tone wheel cracked/slipping on hub/axle/CV shaft, Faulty / intermittent connection at the Anti-Lock Brake Control Module (ABCM or EBCM). 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: C1148 Mercury indicates Speed Wheel Sensor RF Coherency Fault.
Common causes: Common causes include ABS RF Wheel Speed Sensor / Wiring intermittently open/shorted, Tone wheel cracked/slipping on hub/axle/CV shaft, Faulty / intermittent connection at the Anti-Lock Brake Control Module (ABCM or EBCM).
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.

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Code Popularity 1,274

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 17, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1148 Mercury Description

When the driver stops too fast, and one or more wheels begin to lock up, the ABS system takes over. It sees the wheel or wheels slowing down too rapidly by way of wheel speed sensors. When this happens, it shuts off brake fluid to the wheel with the inlet valve/coil, and releases the pressure with an outlet valve/coil. The Wheel Speed Sensor RF is typically found on vehicles with 4 Wheel Anti-Lock Brakes. The ABS system checks to be sure that the sensor electrical circuit is ok every time the key is turned on and the ABS module is powered up. It checks it again once vehicle speed reaches a preset speed (usually 5-15 mph).If there is a problem with the sensor or if the signal from the sensor is erratic, the ABS module will communicate over a data bus to the instrument cluster to turn on the amber Anti-Lock Light and the Red Brake Warning Light, and ABS will be disabled. In this case, the module has checked the right front wheel speed sensor/wiring and found the circuit has an electrical problem. This sets a C1148 in memory.

OBDII Code C1148 Mercury - Speed Wheel Sensor RF Coherency Fault - AutoCodes.com — C1148 Mercury Code - Speed Wheel Sensor RF Coherency Fault

What does this mean?

What are the Possible Causes of the DTC C1148 Mercury?

ABS RF Wheel Speed Sensor / Wiring intermittently open/shorted
Tone wheel cracked/slipping on hub/axle/CV shaft
Faulty / intermittent connection at the Anti-Lock Brake Control Module (ABCM or EBCM)
Faulty Anti-Lock Brake Control Module

How to Fix the DTC C1148 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 does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue being monitored by the manufacturer.
It can occur if:
- The right front hub bearing/brake rotor is bad.
- Can also be set if scan tool software is not updated.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1148 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1148 Mercury Code

1. What does the OBDII code C1148 mean for a Mercury vehicle?

C1148 indicates a "Speed Wheel Sensor RF Coherency Fault," meaning the right front (RF) wheel speed sensor is reporting inconsistent or incorrect data to the ABS module.

2. What are common symptoms of the C1148 code in a Mercury?

Symptoms may include the ABS warning light illuminating, traction control issues, or reduced braking performance in slippery conditions.

3. What causes the C1148 code to appear?

Common causes include a faulty right front wheel speed sensor, damaged wiring or connectors, debris interfering with the sensor, or a malfunctioning ABS module.

4. How can I diagnose the C1148 code on my Mercury?

Start by visually inspecting the right front wheel speed sensor and its wiring for damage or debris. Use an OBDII scanner to verify the code and monitor sensor data for irregularities.

5. Can I drive my Mercury with the C1148 code active?

While the vehicle may still be operable, driving with this code active can compromise ABS and traction control functions, increasing the risk of accidents in certain conditions.

6. How do you fix the C1148 code on a Mercury?

Repairs may include cleaning or replacing the right front wheel speed sensor, repairing damaged wiring, or recalibrating the ABS module if necessary.

7. How much does it cost to fix the C1148 code on a Mercury?

The cost can vary, but replacing a wheel speed sensor typically ranges from $100 to $250, including parts and labor. Additional repairs may increase costs.

8. Can a dirty wheel hub cause the C1148 code?

Yes, debris or rust on the wheel hub can interfere with the wheel speed sensorâ€™s ability to read accurately, triggering the code.

9. Does the C1148 code affect only the ABS system?

Primarily, yes. However, since ABS and traction control systems are intertwined, the C1148 code could also impact traction control functionality.

10. Do I need to reset the ABS system after fixing the C1148 code?

In most cases, the ABS system will clear the code automatically after the issue is resolved, but you may need to use an OBDII scanner to manually clear it.