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Engine-Codes – Generic – B1370:04

B1370:04 Code - Control Module Ignition ON and Start Circuit Short to Ground

Quick Answer

The diagnostic trouble code B1370:04 indicates that there is a short to ground in the control module ignition ON and start circuit. Common causes include Faulty wiring or connectors in the control module ignition ON and start circuit, Corrosion or damage to the wiring harness, Short circuit caused by water intrusion. 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
B1370:04 indicates Control Module Ignition ON and Start Circuit Short to Ground.
Common causes
Common causes include Faulty wiring or connectors in the control module ignition ON and start circuit, Corrosion or damage to the wiring harness, Short circuit caused by water intrusion.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code B1370:04 Description

The diagnostic trouble code B1370:04 indicates that there is a short to ground in the control module ignition ON and start circuit. This means that there is an electrical issue in the circuit that controls the ignition and starting functions of the vehicle. When this circuit is shorted to ground, it can cause issues with starting the vehicle, as well as potentially affect other systems that rely on the ignition and start circuit.

OBDII Code B1370:04 - Control Module Ignition ON and Start Circuit Short to Ground
B1370:04 Code - Control Module Ignition ON and Start Circuit Short to Ground

Common Causes of B1370:04

  1. Faulty wiring or connectors in the control module ignition ON and start circuit.
  2. Corrosion or damage to the wiring harness.
  3. Short circuit caused by water intrusion.
  4. Issues with the control module itself.
  5. Faulty ignition switch.

Symptoms of B1370:04

  1. Vehicle fails to start or starts intermittently.
  2. Engine stalling or shutting off unexpectedly.
  3. Check engine light illuminated on the dashboard.
  4. Electrical issues such as power windows or radio not working properly.

How to Fix B1370:04

  1. Diagnose the exact location of the short to ground using a multimeter and wiring diagram.
  2. Inspect the wiring harness and connectors for any signs of damage or corrosion.
  3. Repair or replace any damaged wiring or connectors.
  4. Check the control module for any faults and replace if necessary.
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved.

Cost to Fix B1370:04

The cost of repairing a control module ignition ON and start circuit short to ground can vary depending on the extent of the damage and the specific components that need to be replaced. On average, this repair can cost between $200 and $500, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to get a few quotes from different shops before proceeding with the repair.

What does this mean?

Tech Notes for B1370:04

B1370:01 Control Module Ignition ON and Start Circuit Short to Battery
B1370:04 Control Module Ignition ON and Start Circuit Short to Ground or Open

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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 B1370:04 Code

1. What are the common symptoms of OBDII code B1370:04?

- Common symptoms include a no-start condition, engine stalling, and potentially a loss of communication with the vehicle's control modules.

2. What could cause the Control Module Ignition ON and Start Circuit Short to Ground?

- This code is usually triggered by a short to ground in the wiring harness, a faulty ignition switch, or a defective control module.

3. How can I diagnose the cause of OBDII code B1370:04?

- Diagnosing this code typically involves performing a thorough visual inspection of the wiring harness, testing the ignition switch, and using a multimeter to check for shorts to ground.

4. Is it safe to continue driving with OBDII code B1370:04 active?

- It is not recommended to drive the vehicle with this code active, as it can lead to potential starting issues and cause further damage to the control modules.

5. Can a DIY enthusiast repair OBDII code B1370:04 at home?

- Depending on the root cause, some DIY enthusiasts may be able to repair this issue at home by following a detailed diagnostic and repair procedure. However, professional assistance may be required for complex cases.

6. How much does it typically cost to repair OBDII code B1370:04?

- The cost of repairing this code can vary significantly depending on the cause of the issue. Simple fixes like repairing a wiring harness may cost less than replacing a control module.

7. Is it necessary to clear the code after repairing OBDII code B1370:04?

- Yes, it is important to clear the code using an OBDII scanner after repairing the underlying issue. This will reset the vehicle's computer and turn off the Check Engine Light.

8. Are there any preventive measures to avoid OBDII code B1370:04 in the future?

- Regular maintenance, such as checking the condition of the wiring harness and ensuring proper electrical connections, can help prevent issues that may trigger this code.

9. Can extreme weather conditions contribute to triggering OBDII code B1370:04?

- Extreme weather conditions can potentially exacerbate existing electrical issues in the vehicle, leading to the triggering of this code. It is important to keep the vehicle well maintained in all weather conditions.

10. How long does it typically take to repair OBDII code B1370:04?

- The repair time for this code can vary depending on the complexity of the issue and the availability of parts. Simple fixes may take a few hours, while more intricate repairs could require a day or more.

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