AutoCodes – Generic – B1557

B1557 Code - Ignition Run/Start Circuit Short To Battery

Quick Answer

The Body Control Module (BCM) monitors the Ignition Switch. 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: B1557 indicates Ignition Run/Start Circuit Short To Battery.
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 10,493

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 May 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1557 Description

The Body Control Module (BCM) monitors the Ignition Switch. The BCM sets the OBDII code when the Ignition Switch is not to factory specifications.

OBDII Code B1557 - Ignition Run/Start Circuit Short To Battery - AutoCodes.com — B1557 Code - Ignition Run/Start Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1557?

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 B1557?

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 B1557 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 B1557 code?

Need more information on how to fix the B1557 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1557 code diagnosed by a professional: Find a repair shop in your area

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 B1557 Code

1. What are the common symptoms of OBDII code B1557 - Ignition Run/Start Circuit Short To Battery?

- Common symptoms include difficulty starting the vehicle, stalling or rough idling, and the engine not turning off properly.

2. What are the potential causes of OBDII code B1557?

- The code B1557 can be caused by a short circuit between the ignition run/start circuit and the battery, faulty wiring or connectors, or a malfunctioning ignition switch.

3. How can I diagnose OBDII code B1557?

- Diagnosing code B1557 involves using a scan tool to retrieve the code and examining the wiring and connectors in the ignition run/start circuit for any signs of damage or short circuits.

4. Is it safe to continue driving with OBDII code B1557 present?

- It is not recommended to continue driving with code B1557 present, as it can lead to further electrical issues or potential safety hazards while operating the vehicle.

5. How can I repair OBDII code B1557 - Ignition Run/Start Circuit Short To Battery?

- To repair code B1557, you will need to locate and repair the short circuit between the ignition run/start circuit and the battery, replace any faulty wiring or connectors, and ensure the ignition switch is functioning properly.

6. Can a DIY enthusiast fix OBDII code B1557 at home?

- Depending on your experience and skill level with automotive electrical systems, it may be possible to fix code B1557 at home. However, it is recommended to consult a professional if you are unsure or unfamiliar with electrical diagnostics and repairs.

7. Will resetting the OBDII system clear code B1557?

- Simply resetting the OBDII system will not fix the underlying issue causing code B1557. It may temporarily clear the code, but it will likely reappear until the root cause is identified and repaired.

8. How much does it typically cost to repair OBDII code B1557 at a mechanic or dealership?

- The cost of repairing code B1557 can vary depending on the extent of the damage and the specific repairs needed. It is advisable to obtain quotes from different mechanics or dealerships for an accurate estimate.

9. Are there any preventative maintenance tips to avoid OBDII code B1557 in the future?

- Regularly inspecting the wiring and connectors in the ignition system, addressing any electrical issues promptly, and avoiding overloading the electrical system can help prevent code B1557 from occurring in the future.

10. Can OBDII code B1557 cause other problems in the vehicle if left unresolved?

- Yes, if left unresolved, code B1557 can lead to further electrical issues, affect the vehicle's overall performance, and potentially cause damage to other electrical components in the vehicle.