AutoCodes – Mercury – B1142 Mercury

B1142 Mercury Code - Ignition Status 1 Signal Invalid

Quick Answer

On vehicles equipped with a conventional ignition switch, fused battery voltage is sent to the ignition switch from Battery. Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch 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: B1142 Mercury indicates Ignition Status 1 Signal Invalid.
Common causes: Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch 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 1,009

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 Feb 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1142 Mercury Description

On vehicles equipped with a conventional ignition switch, fused battery voltage is sent to the ignition switch from Battery. This voltage is then sent to the Body Control Module (BCM) along one of 3 circuits, depending on ignition switch position.
On vehicles equipped with a start/stop switch, fused battery voltage is sent to one set of contacts in the start/stop switch from Battery. When the switch is pressed, this voltage is then sent to the Body Control Module (BCM), the Remote Function Actuator (RFA) module and the PCM. The other set of contacts in the start/stop switch connects the BCM to ground. When the switch is pressed, the BCM detects this ground signal and takes appropriate action.

OBDII Code B1142 Mercury - Ignition Status 1 Signal Invalid - AutoCodes.com — B1142 Mercury Code - Ignition Status 1 Signal Invalid

What does this mean?

What are the Possible Causes of the DTC B1142 Mercury?

Faulty Ignition Switch
Ignition Switch harness is open or shorted
Ignition Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1142 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 B1142 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.

Need more information about the B1142 Mercury code?

Need more information on how to fix the B1142 Mercury code? Get Access to Factory Service Manuals

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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 B1142 Mercury Code

1. What are the common symptoms of OBDII code B1142 Mercury (Ignition Status 1 Signal Invalid)?

- Common symptoms include issues with starting the vehicle, erratic engine performance, and possible stalling.

2. What are the possible causes of OBDII code B1142 Mercury?

- The code B1142 can be triggered by a faulty ignition switch, damaged wiring, or a malfunctioning ignition control module.

3. How can I diagnose the cause of OBDII code B1142 on my Mercury vehicle?

- To diagnose the issue, it is recommended to use an OBDII scanner to retrieve the specific error code and then inspect the ignition system components for any visible damage or wear.

4. What are some repair tips for addressing OBDII code B1142 on a Mercury vehicle?

- Repair tips may include checking and repairing any damaged wiring, replacing the ignition switch or ignition control module if necessary, and clearing the error code with an OBDII scanner.

5. Is it safe to continue driving with OBDII code B1142 Mercury (Ignition Status 1 Signal Invalid) present?

- It is not recommended to continue driving with this code present, as it can lead to potential issues with the vehicle's ignition system and overall performance.

6. Can a DIY enthusiast fix OBDII code B1142 on a Mercury vehicle?

- Depending on the level of expertise, a DIY enthusiast may be able to address the issue by following repair guides and using the necessary tools to diagnose and fix the problem.

7. How much does it typically cost to repair OBDII code B1142 Mercury at a mechanic or dealership?

- The cost of repair can vary depending on the specific cause of the code, but it may range from $100 to $500 or more, including parts and labor.

8. Will resetting the error code make OBDII code B1142 Mercury go away permanently?

- Resetting the error code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear.

9. Are there any recalls or service bulletins related to OBDII code B1142 on Mercury vehicles?

- It is advisable to check with a Mercury dealership or visit the National Highway Traffic Safety Administration (NHTSA) website for any relevant recalls or service bulletins related to this code.

10. How can I prevent OBDII code B1142 from occurring in the future on my Mercury vehicle?

- Regular maintenance of the ignition system, including checking and replacing worn components, can help prevent the recurrence of OBDII code B1142 on your Mercury vehicle.