AutoCodes – Generic – B12CB

B12CB Code - Start/Stop Eco-Start Enable Button Circuit Short To Ground

Quick Answer

The stop-start disable button is a momentary contact switch. Common causes include Faulty Start/Stop Button, Start/Stop Button harness is open or shorted, Start/Stop Button 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: B12CB indicates Start/Stop Eco-Start Enable Button Circuit Short To Ground.
Common causes: Common causes include Faulty Start/Stop Button, Start/Stop Button harness is open or shorted, Start/Stop Button 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 3,036

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 Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B12CB Description

The stop-start disable button is a momentary contact switch. It is normally open, Controlled Area Network (CAN) signal low. Closed (button being pushed) is CAN signal high. The Front Controls Interface Module reads the switch status and sends it over CAN to the Powertrain Control Module (PCM). If the button is stuck open, there are no low to high transitions. Since the PCM does not recognize a button push, stop-start will not be disabled if requested by the customer. If the button is stuck closed, there are no low to high transitions. Since the PCM does not recognize a button push, stop-start will not be disabled if requested by the customer.

OBDII Code B12CB - Start/Stop Eco-Start Enable Button Circuit Short To Ground - AutoCodes.com — B12CB Code - Start/Stop Eco-Start Enable Button Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B12CB?

Faulty Start/Stop Button
Start/Stop Button harness is open or shorted
Start/Stop Button circuit poor electrical connection

How to Fix the DTC B12CB?

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 B12CB 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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Need Help with the Code?

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Information for Specific Makes

B12CB Ford — Start/Stop Eco-Start Enable Button Circuit Short To Ground
B12CB Lincoln — Start/Stop Eco-Start Enable Button Circuit Short To Ground
B12CB Mercury — Start/Stop Eco-Start Enable Button Circuit Short To Ground

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 B12CB Code

1. What are the common symptoms of OBDII code B12CB?

The common symptoms of OBDII code B12CB, Start/Stop Eco-Start Enable Button Circuit Short To Ground, include issues with the start/stop system not functioning properly, the vehicle not turning off when the button is pressed, or the start/stop button not responding.

2. What are the possible causes of OBDII code B12CB?

Possible causes of OBDII code B12CB include a short circuit to ground in the Eco-Start Enable Button circuit, damaged wiring or connectors related to the button, or a faulty start/stop button itself.

3. How can I diagnose OBDII code B12CB?

Diagnosing OBDII code B12CB involves using a scan tool to retrieve the fault code, inspecting the wiring and connectors related to the start/stop button, and performing continuity and resistance tests to pinpoint the location of the short circuit.

4. Can I still drive my vehicle with OBDII code B12CB present?

It is not recommended to drive your vehicle with OBDII code B12CB present, as it may lead to further electrical issues or potential safety hazards related to the start/stop system.

5. How can I repair OBDII code B12CB?

To repair OBDII code B12CB, you will need to locate and repair the short circuit to ground in the Eco-Start Enable Button circuit. This may involve repairing or replacing damaged wiring, connectors, or the start/stop button itself.

6. Can OBDII code B12CB cause other problems in my vehicle?

While OBDII code B12CB specifically relates to the Start/Stop Eco-Start Enable Button Circuit Short To Ground, unresolved electrical issues can potentially lead to other problems in your vehicle over time if left unaddressed.

7. Are there any safety concerns associated with OBDII code B12CB?

Since OBDII code B12CB involves a short circuit to ground in the start/stop system, there may be safety concerns related to the proper functioning of this system, especially in emergency situations where the vehicle needs to be turned off quickly.

8. Is OBDII code B12CB a common issue in certain vehicle models?

OBDII code B12CB may be more common in vehicles equipped with start/stop systems, as this code specifically pertains to the Eco-Start Enable Button circuit. However, the frequency of occurrence can vary between different vehicle models.

9. Can I reset OBDII code B12CB on my own?

While you can clear the fault code using a scan tool, it is important to diagnose and repair the underlying issue causing OBDII code B12CB to prevent it from reoccurring.

10. How can I prevent OBDII code B12CB from happening in the future?

To prevent OBDII code B12CB from happening in the future, regularly inspect and maintain the wiring, connectors, and components related to the start/stop system in your vehicle to ensure they are in good condition and free of damage.