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Engine-Codes – RAM – B1820 RAM

B1820 RAM Code - Hood Ajar Input Circuit High

Quick Answer

The B1820 RAM diagnostic trouble code (DTC) refers to the Hood Ajar Input Circuit High. Common causes include Faulty hood ajar sensor, Damaged wiring or connectors in the hood ajar circuit, Corrosion or debris interfering with the hood ajar sensor. 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
B1820 RAM indicates Hood Ajar Input Circuit High.
Common causes
Common causes include Faulty hood ajar sensor, Damaged wiring or connectors in the hood ajar circuit, Corrosion or debris interfering with the hood ajar sensor.
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 15, 2024
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Code B1820 RAM Description

The B1820 RAM diagnostic trouble code (DTC) refers to the Hood Ajar Input Circuit High. This code indicates that there is a high voltage condition detected in the circuit responsible for monitoring the status of the hood latch. In modern vehicles, the hood ajar sensor plays a crucial role in ensuring the safety and security of the vehicle. When the hood is not properly closed, the sensor sends a signal to the vehicle's computer system, which can trigger warning lights on the dashboard and potentially affect other systems.

OBDII Code B1820 RAM - Hood Ajar Input Circuit High
B1820 RAM Code - Hood Ajar Input Circuit High

Common Causes of B1820 RAM

  1. Faulty hood ajar sensor.
  2. Damaged wiring or connectors in the hood ajar circuit.
  3. Corrosion or debris interfering with the hood ajar sensor.
  4. Body control module malfunction.
  5. Impact or damage to the hood latch mechanism.

Symptoms of B1820 RAM

  1. Hood ajar warning light illuminated on the dashboard.
  2. Inability to engage certain vehicle systems due to failsafe mode.
  3. Audible warning chime indicating the hood is open when it is not.
  4. Intermittent issues with the hood ajar sensor, such as false alarms or inconsistent readings.

How to Fix B1820 RAM

  1. Begin by visually inspecting the hood ajar sensor, wiring, and connectors for any obvious signs of damage or corrosion.
  2. Use a multimeter to test the voltage output of the hood ajar sensor to determine if it is within the expected range.
  3. If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  4. Check and repair any damaged wiring or connectors in the hood ajar circuit.
  5. If the issue persists, further diagnostics may be needed to identify any underlying problems with the body control module or other related components.

Cost to Fix B1820 RAM

The typical repair costs for addressing the B1820 RAM code can vary depending on the specific cause of the issue and the make and model of the vehicle. In general, replacing a hood ajar sensor can cost between $100 and $200, including parts and labor. If the problem is related to wiring or connectors, additional labor may be required, potentially increasing the total cost. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your specific circumstances.

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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 B1820 RAM Code

1. What are the common symptoms of OBDII code B1820 RAM for the Hood Ajar Input Circuit High?

- Common symptoms include the hood warning light staying illuminated, false hood open warnings, and potential issues with the vehicle's security system.

2. What are the possible causes of the Hood Ajar Input Circuit High code B1820 RAM?

- The code can be triggered by a faulty hood latch sensor, damaged wiring in the hood ajar circuit, or a malfunctioning body control module.

3. How can I diagnose the source of the Hood Ajar Input Circuit High code B1820 RAM?

- You can start by visually inspecting the hood latch sensor and its wiring for any visible damage. Using a multimeter to test the sensor's continuity and resistance can help pinpoint the issue.

4. What are some repair tips for resolving the B1820 RAM code related to the hood ajar input circuit high?

- Ensure the hood is securely closed and latched properly. Check and repair any damaged wiring in the hood ajar circuit. Replace the hood latch sensor if it is found to be faulty.

5. Can the B1820 RAM code for the Hood Ajar Input Circuit High affect the vehicle's overall performance?

- While this code is more related to the hood sensor system and security warnings, it may not directly impact the vehicle's performance but could cause inconvenience with false alerts.

6. Is it safe to continue driving with the B1820 RAM code indicating a high input circuit for the hood ajar sensor?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to avoid potential security system malfunctions or persistent warning lights.

7. How much does it typically cost to repair the B1820 RAM code for the Hood Ajar Input Circuit High?

- The cost of repair can vary depending on the exact cause of the issue. Replacing a hood latch sensor or repairing wiring may cost anywhere from $50 to $200, including labor.

8. Can I reset the B1820 RAM code for the Hood Ajar Input Circuit High on my own?

- Yes, you can reset the code using an OBDII scanner. However, it is important to address the underlying issue causing the code to prevent it from reoccurring.

9. Are there any preventive maintenance measures to avoid encountering the B1820 RAM code for the Hood Ajar Input Circuit High in the future?

- Regularly inspecting the hood latch sensor and its wiring for any signs of wear or damage can help prevent issues related to the hood ajar input circuit.

10. Will fixing the B1820 RAM code related to the Hood Ajar Input Circuit High require a visit to a professional mechanic?

- While some DIY enthusiasts may be able to address the issue themselves by replacing components or repairing wiring, consulting a professional mechanic for accurate diagnosis and repair is recommended for those less experienced.

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