AutoCodes – Generic – B1A7D

B1A7D Code - Start Button

Quick Answer

Any time the Start/Stop Button is pressed, the Radio Frequency Hub (RF Hub) will check the Security K Line Communication circuit and the Ignition Switch Sense circuit. 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: B1A7D indicates Start Button.
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 4,741

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 14, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1A7D Description

Any time the Start/Stop Button is pressed, the Radio Frequency Hub (RF Hub) will check the Security K Line Communication circuit and the Ignition Switch Sense circuit. It samples these circuits every 10ms. while the button is pressed. If these two circuits do not match, during a button press, this code will set or if the Security K Line Communication circuit and the Ignition Switch Position Signal circuit match, during a button press, but are On for longer than 25 seconds.

OBDII Code B1A7D - Start Button - AutoCodes.com — B1A7D Code - Start Button

What does this mean?

What are the Possible Causes of the DTC B1A7D?

Faulty Ignition Switch
Ignition Switch harness is open or shorted
Ignition Switch circuit poor electrical connection
Faulty Keyless Ignition Nod (KIN)
Faulty Ignition Node Module (IGNM)

How to Fix the DTC B1A7D?

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

B1A7D-01 START BUTTON GENERAL ELECTRICAL FAILURE
B1A7D-2A START BUTTON STUCK

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1A7D 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 B1A7D code?

Need more information on how to fix the B1A7D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1A7D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1A7D Chrysler — Start Button
B1A7D Dodge — Start Button
B1A7D Jeep — Start Button
B1A7D RAM — Start Button

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 B1A7D Code

1. What does OBDII code B1A7D for the Start Button indicate?

This code typically indicates a malfunction in the start button circuit.

2. What are the common symptoms of OBDII code B1A7D?

Common symptoms include the start button not working, difficulty starting the vehicle, or the engine not turning over.

3. What are the possible causes of OBDII code B1A7D?

Possible causes may include a faulty start button, wiring issues in the start button circuit, or a problem with the start button module.

4. How can I diagnose the issue related to OBDII code B1A7D?

Diagnosing this issue may involve checking the wiring connections to the start button, testing the start button itself, and using a diagnostic tool to read the code and gather more information.

5. Can I still drive my vehicle with OBDII code B1A7D present?

It is not recommended to drive the vehicle with this code present, as it may lead to unpredictable starting issues or potential stalling.

6. How can I repair OBDII code B1A7D related to the Start Button?

Repair options may include replacing the start button, repairing any damaged wiring, or recalibrating the start button module.

7. Is it possible to reset OBDII code B1A7D without fixing the underlying issue?

While you can clear the code temporarily, it is important to address the root cause to prevent further problems.

8. Can a DIY enthusiast fix OBDII code B1A7D at home?

Depending on your skill level and access to tools, you may be able to troubleshoot and repair this issue at home, but professional help is recommended for complex electrical systems.

9. How much does it cost to repair OBDII code B1A7D in a professional auto repair shop?

The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. How often does OBDII code B1A7D related to the Start Button occur in vehicles?

This specific code may not be as common as other OBDII codes, but it can still occur in vehicles with start button systems experiencing issues.

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