AutoCodes – Jeep – B1820 Jeep

B1820 Jeep 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 Jeep 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 9,328

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

What does this mean?

What are the Possible Causes of the DTC B1820 Jeep?

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 Jeep?

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 Jeep 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.

Need more information about the B1820 Jeep code?

Need more information on how to fix the B1820 Jeep code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1820 Jeep code diagnosed by a professional: Find a repair shop in your area

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 Jeep Code

1. What are common symptoms of OBDII code B1820 Jeep (Hood Ajar Input Circuit High)?

The common symptoms include the hood warning light staying illuminated, the hood not latching properly, and potential issues with the vehicle's alarm system.

2. What are the possible causes of OBDII code B1820 Jeep (Hood Ajar Input Circuit High)?

Possible causes include a faulty hood ajar switch, damaged wiring related to the hood ajar circuit, or a malfunctioning body control module.

3. How can I diagnose the issue related to OBDII code B1820 Jeep (Hood Ajar Input Circuit High)?

You can diagnose the problem by visually inspecting the hood ajar switch and its wiring, testing the switch for continuity, and using a scan tool to check for trouble codes in the body control module.

4. Can I drive my Jeep with OBDII code B1820 (Hood Ajar Input Circuit High) without causing further damage?

While it may be possible to drive the vehicle with this code, it is not recommended as it can lead to safety issues, false alarms, and potential problems with the vehicle's security system.

5. How can I repair OBDII code B1820 Jeep (Hood Ajar Input Circuit High)?

Repair options include replacing the hood ajar switch, repairing or replacing damaged wiring, or reprogramming the body control module if necessary.

6. Is it safe to manually override the hood ajar switch to clear the OBDII code B1820?

Manually overriding the hood ajar switch is not recommended as it can compromise the vehicle's safety features and may not resolve the underlying issue causing the code.

7. Will resetting the vehicle's computer clear the OBDII code B1820 Jeep (Hood Ajar Input Circuit High)?

Resetting the computer may temporarily clear the code, but it is important to diagnose and repair the root cause of the issue to prevent the code from reoccurring.

8. Can extreme weather conditions affect the hood ajar switch and trigger OBDII code B1820?

Yes, extreme weather conditions such as high humidity or temperature variations can affect the hood ajar switch and contribute to triggering the OBDII code B1820.

9. How long does it typically take to repair OBDII code B1820 Jeep (Hood Ajar Input Circuit High)?

The repair time can vary depending on the specific cause of the issue, but it may take anywhere from 30 minutes to a few hours to diagnose and fix the problem.

10. Can a DIY enthusiast repair OBDII code B1820 (Hood Ajar Input Circuit High) or should I take my Jeep to a professional mechanic?

While some simple repairs like replacing the hood ajar switch may be done by a DIY enthusiast, it is recommended to consult a professional mechanic for accurate diagnosis and repair of complex issues related to this OBDII code.