AutoCodes – RAM – B1820 RAM

B1820 RAM Code - Hood Ajar Input Circuit High

Quick Answer

The Totally Integrated Power Module (TIPM) monitors the Hood Ajar Switch Sense Circuit. Common causes include Faulty Hood Ajar Switch Sense, Hood Ajar Switch Sense harness is open or shorted, Hood Ajar Switch Sense 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: B1820 RAM indicates Hood Ajar Input Circuit High.
Common causes: Common causes include Faulty Hood Ajar Switch Sense, Hood Ajar Switch Sense harness is open or shorted, Hood Ajar Switch Sense 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 2,046

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 Jul 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1820 RAM Description

The Totally Integrated Power Module (TIPM) monitors the Hood Ajar Switch Sense Circuit. When the Totally Integrated Power Module senses 12 volts on the Hood Ajar Switch Sense circuit for over 10 seconds, this Diagnostic Trouble Code (DTC) will set.

OBDII Code B1820 RAM - Hood Ajar Input Circuit High - AutoCodes.com — B1820 RAM Code - Hood Ajar Input Circuit High

What does this mean?

What are the Possible Causes of the DTC B1820 RAM?

Faulty Hood Ajar Switch Sense
Hood Ajar Switch Sense harness is open or shorted
Hood Ajar Switch Sense circuit poor electrical connection
Faulty Totally Integrated Power Module (TIPM)

How to Fix the DTC B1820 RAM?

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 B1820 RAM 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.

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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.