AutoCodes – Mercury – C1123 Mercury

C1123 Mercury Code - Vehicle Speed Sensor Input Short to Battery

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Vehicle Speed Sensor. Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness is open or shorted, Vehicle Speed Sensor circuit poor electrical connection. 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: C1123 Mercury indicates Vehicle Speed Sensor Input Short to Battery.
Common causes: Common causes include Faulty Vehicle Speed Sensor, Vehicle Speed Sensor harness is open or shorted, Vehicle Speed Sensor circuit poor electrical connection.
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 1,765

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 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1123 Mercury Description

The Anti-Lock Brake System (ABS) Module monitors the Vehicle Speed Sensor. The ABS Module sets the OBDII code when the Vehicle Speed Sensor is not to factory specifications.

OBDII Code C1123 Mercury - Vehicle Speed Sensor Input Short to Battery - AutoCodes.com — C1123 Mercury Code - Vehicle Speed Sensor Input Short to Battery

What does this mean?

What are the Possible Causes of the DTC C1123 Mercury?

Faulty Vehicle Speed Sensor
Vehicle Speed Sensor harness is open or shorted
Vehicle Speed Sensor circuit poor electrical connection

How to Fix the DTC C1123 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 C1123 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 C1123 Mercury Code

1. What are the common symptoms of an OBDII code C1123 Mercury?

The common symptoms of OBDII code C1123 Mercury, indicating a Vehicle Speed Sensor Input Short to Battery, may include issues with the speedometer, cruise control malfunction, and the illumination of the check engine light.

2. What are the possible causes of OBDII code C1123 Mercury?

Possible causes of OBDII code C1123 Mercury can include a faulty vehicle speed sensor, damaged wiring or connectors related to the speed sensor, or a short circuit in the speed sensor circuit.

3. How can I diagnose the OBDII code C1123 Mercury at home?

You can diagnose the OBDII code C1123 Mercury at home using an OBDII scanner to retrieve the specific trouble code, inspecting the vehicle speed sensor and its connections for any visible damage, and checking the wiring for shorts or open circuits.

4. Can I continue driving my vehicle with OBDII code C1123 Mercury?

It is not recommended to drive your vehicle with OBDII code C1123 Mercury, as it can affect the speedometer accuracy and potentially lead to other issues related to speed sensor input.

5. How can I repair OBDII code C1123 Mercury?

To repair OBDII code C1123 Mercury, you may need to replace the faulty vehicle speed sensor, repair or replace damaged wiring or connectors, and clear the trouble code with an OBDII scanner.

6. Is it necessary to reset the ECU after repairing OBDII code C1123 Mercury?

After repairing OBDII code C1123 Mercury, it is recommended to reset the ECU using an OBDII scanner to clear the trouble code and ensure that the issue has been resolved.

7. Can weather conditions affect OBDII code C1123 Mercury?

Extreme weather conditions, such as excessive heat or moisture, can potentially affect the vehicle speed sensor and lead to OBDII code C1123 Mercury due to increased risk of sensor damage or wiring corrosion.

8. How much does it cost to fix OBDII code C1123 Mercury at a repair shop?

The cost to fix OBDII code C1123 Mercury at a repair shop can vary depending on the labor rates, parts needed for repair, and the specific cause of the issue, but it may range from $100 to $300 or more.

9. Will OBDII code C1123 Mercury cause my vehicle to fail an emissions test?

OBDII code C1123 Mercury may cause your vehicle to fail an emissions test, as it indicates a problem with the vehicle speed sensor input, which can impact the overall performance and emissions output of the vehicle.

10. How can I prevent OBDII code C1123 Mercury from occurring in the future?

To prevent OBDII code C1123 Mercury from occurring in the future, regularly inspect and maintain the vehicle speed sensor and its wiring, avoid driving through deep water or harsh conditions that can damage the sensor, and address any related issues promptly to prevent further damage.