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Engine-Codes – Generic – B2172

B2172 Code - Inertia Switch Input Circuit Open

Quick Answer

The B2172 diagnostic trouble code (DTC) indicates that there is an open circuit in the inertia switch input circuit. Common causes include Damaged wiring or connectors in the inertia switch circuit, Faulty inertia switch, Corrosion in the circuit. 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
B2172 indicates Inertia Switch Input Circuit Open.
Common causes
Common causes include Damaged wiring or connectors in the inertia switch circuit, Faulty inertia switch, Corrosion in the circuit.
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 B2172 Description

The B2172 diagnostic trouble code (DTC) indicates that there is an open circuit in the inertia switch input circuit. The inertia switch is a safety feature in vehicles that is designed to shut off the fuel pump in the event of a collision or sudden impact. When this switch is triggered, it cuts off fuel supply to prevent fires or explosions.

OBDII Code B2172 - Inertia Switch Input Circuit Open
B2172 Code - Inertia Switch Input Circuit Open

Common Causes of B2172

  1. Damaged wiring or connectors in the inertia switch circuit
  2. Faulty inertia switch
  3. Corrosion in the circuit
  4. Loose connections in the circuit
  5. Impact or collision causing physical damage to the switch or wiring

Symptoms of B2172

  1. Check engine light illuminated
  2. Fuel pump not shutting off after a collision
  3. Vehicle stalling after impact
  4. Fuel leakage in the event of a crash
  5. Inability to start the vehicle after an impact

How to Fix B2172

  1. Begin by inspecting the wiring and connectors in the inertia switch circuit for any signs of damage or corrosion.
  2. Test the inertia switch to determine if it is functioning properly. If faulty, replace the switch with a new one.
  3. Check for loose connections in the circuit and secure them properly.
  4. Clear the DTC from the ECM's memory using a diagnostic tool.
  5. Verify proper operation by testing the system and ensuring that the fuel pump shuts off in the event of a simulated impact.

Cost to Fix B2172

** The cost of repairing the inertia switch input circuit open issue can vary depending on the specific cause of the problem and the vehicle's make and model. On average, the parts for this repair can range from $50 to $150, while labor costs can range from $80 to $150 per hour. In total, the repair could cost anywhere from $150 to $400, including parts and labor. It is recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's specific needs.

What does this mean?

Tech Notes for B2172





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Code B2172 Information for Specific Makes

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 B2172 Code

1. What are the common symptoms of OBDII code B2172 (Inertia Switch Input Circuit Open)?

- Common symptoms include the vehicle stalling or not starting, the check engine light being illuminated, and potential issues with the fuel pump.

2. What can cause the Inertia Switch Input Circuit Open code B2172?

- The code can be triggered by a faulty inertia switch, damaged wiring in the inertia switch circuit, or a loose connection in the circuit.

3. How can I diagnose the Inertia Switch Input Circuit Open problem?

- You can diagnose the issue by inspecting the inertia switch and its wiring for any visible damage, checking for loose connections, and using a multimeter to test for continuity in the circuit.

4. What should I do if my vehicle displays the B2172 OBDII code?

- If your vehicle shows the B2172 code, it's important to have the issue diagnosed and repaired promptly to prevent potential safety hazards or further damage to the vehicle.

5. Can I reset the B2172 code myself after fixing the issue?

- Once the underlying problem causing the B2172 code is fixed, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

6. Is it safe to drive my vehicle with the Inertia Switch Input Circuit Open code?

- It is not recommended to drive your vehicle with the B2172 code, as it can lead to potential fuel delivery issues, stalling, or other safety concerns on the road.

7. How much does it typically cost to repair the Inertia Switch Input Circuit Open issue?

- The cost of repairing the B2172 code can vary depending on the underlying cause, but it may involve replacing the inertia switch, repairing damaged wiring, or fixing loose connections.

8. Can the B2172 code be triggered by other underlying problems in the vehicle?

- While the B2172 code is typically associated with the inertia switch circuit, it's essential to rule out any other potential issues that could be causing the code before proceeding with repairs.

9. Are there any preventive measures I can take to avoid the B2172 code in the future?

- To prevent the B2172 code from occurring, it's essential to regularly inspect the inertia switch and its wiring for any signs of wear or damage and address any issues promptly.

10. Will the B2172 code affect my vehicle's overall performance?

- The B2172 code can impact your vehicle's performance by causing fuel delivery issues, stalling, or preventing the vehicle from starting, so it's crucial to address the problem promptly.

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