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Engine-Codes – Generic – B1846

B1846 Code - Ignition Tamper Circuit Open

Quick Answer

The diagnostic code B1846 refers to an "Ignition Tamper Circuit Open" issue. Common causes include Damaged wiring in the ignition tamper circuit, Faulty ignition tamper module, Malfunctioning ignition switch. 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
B1846 indicates Ignition Tamper Circuit Open.
Common causes
Common causes include Damaged wiring in the ignition tamper circuit, Faulty ignition tamper module, Malfunctioning ignition switch.
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 07, 2024
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Code B1846 Description

The diagnostic code B1846 refers to an "Ignition Tamper Circuit Open" issue. This code indicates that there is an open circuit in the ignition tamper system, which is designed to prevent unauthorized starting of the vehicle. The ignition tamper circuit is a security feature that detects any attempts to tamper with the ignition system, such as hot-wiring the vehicle or using a counterfeit key.

OBDII Code B1846 - Ignition Tamper Circuit Open
B1846 Code - Ignition Tamper Circuit Open

Common Causes of B1846

  1. Damaged wiring in the ignition tamper circuit
  2. Faulty ignition tamper module
  3. Malfunctioning ignition switch
  4. Issues with the vehicle's security system

Symptoms of B1846

  1. Engine cranks but does not start
  2. Security light flashing on the dashboard
  3. Inability to start the vehicle with the key
  4. Loss of power to the ignition system

How to Fix B1846

  1. Diagnose the issue using a diagnostic scanner to confirm the B1846 code
  2. Inspect the wiring in the ignition tamper circuit for any damage or corrosion
  3. Test the ignition tamper module and ignition switch for proper functionality
  4. Replace any faulty components, such as damaged wiring or a malfunctioning ignition tamper module
  5. Clear the diagnostic trouble codes and test the vehicle to ensure the issue has been resolved

Cost to Fix B1846

The typical repair costs for addressing an ignition tamper circuit open issue can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local repair shops for a more accurate estimate. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops often charge less.

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Code B1846 Information for Specific Makes

  • B1846 Lexus — Open In Curtain Shield Squib Left 2nd Step Circuit
  • B1846 Scion — Open In Curtain Shield Squib Left 2nd Step Circuit
  • B1846 Toyota — Open In Curtain Shield Squib Left 2nd Step Circuit
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 B1846 Code

1. What are some common symptoms of OBDII code B1846 (Ignition Tamper Circuit Open)?

- Common symptoms include difficulty starting the vehicle, intermittent stalling, and the ignition system not functioning properly.

2. What can cause the OBDII code B1846 (Ignition Tamper Circuit Open) to trigger?

- The code may be triggered by a loose or damaged wiring connection in the ignition tamper circuit, a faulty ignition tamper module, or issues with the ignition switch.

3. How can I diagnose the cause of OBDII code B1846 (Ignition Tamper Circuit Open)?

- To diagnose the issue, you can use a diagnostic scanner to retrieve the specific trouble code and then inspect the wiring, connectors, and components related to the ignition tamper circuit.

4. What are some repair tips for fixing OBDII code B1846 (Ignition Tamper Circuit Open)?

- Repair tips include checking and repairing any loose or damaged wiring connections, replacing the ignition tamper module if necessary, and ensuring the ignition switch is functioning correctly.

5. Can OBDII code B1846 (Ignition Tamper Circuit Open) be fixed by resetting the vehicle's computer?

- Resetting the vehicle's computer may temporarily clear the code, but if the underlying issue causing the code to trigger is not addressed, the code is likely to return.

6. Is it safe to continue driving with OBDII code B1846 (Ignition Tamper Circuit Open) present?

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

7. How much does it typically cost to repair OBDII code B1846 (Ignition Tamper Circuit Open)?

- The cost of repairing this code can vary depending on the underlying cause and the specific components that need to be replaced, but it may range from $100 to $300 or more.

8. Can I fix OBDII code B1846 (Ignition Tamper Circuit Open) myself, or should I take it to a mechanic?

- If you have experience with automotive electrical systems and diagnostics, you may be able to address the issue yourself. Otherwise, it is recommended to take your vehicle to a qualified mechanic for proper diagnosis and repair.

9. Will OBDII code B1846 (Ignition Tamper Circuit Open) cause my vehicle to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test, as it indicates a malfunction in the ignition tamper circuit that can impact the vehicle's emissions control system.

10. How long does it typically take to repair OBDII code B1846 (Ignition Tamper Circuit Open)?

- The repair time can vary depending on the complexity of the issue and the availability of parts, but it may take anywhere from 1 to 3 hours to diagnose and fix the problem.

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