AutoCodes – RAM – B1818 RAM

B1818 RAM Code - Rear Passenger Door Ajar Circuit Short

Quick Answer

The Body Control Module (BCM) monitors the Rear Passenger Door Ajar Switch Sense. Common causes include Faulty Door Ajar Switch Sense, Door Ajar Switch Sense harness is open or shorted, Door 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: B1818 RAM indicates Rear Passenger Door Ajar Circuit Short.
Common causes: Common causes include Faulty Door Ajar Switch Sense, Door Ajar Switch Sense harness is open or shorted, Door 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 1,019

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 02, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1818 RAM Description

The Body Control Module (BCM) monitors the Rear Passenger Door Ajar Switch Sense. The BCM sets the OBDII code when it detects a short to ground, short to voltage or open on the Door Ajar Switch Sense circuit.

OBDII Code B1818 RAM - Rear Passenger Door Ajar Circuit Short - AutoCodes.com — B1818 RAM Code - Rear Passenger Door Ajar Circuit Short

What does this mean?

What are the Possible Causes of the DTC B1818 RAM?

Faulty Door Ajar Switch Sense
Door Ajar Switch Sense harness is open or shorted
Door Ajar Switch Sense circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1818 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 does this mean?

Code Tech Notes

B1818-11 REAR PASSENGER DOOR AJAR CIRCUIT SHORT TO GROUND
B1818-15 REAR PASSENGER DOOR AJAR CIRCUIT SHORT TO BATTERY OR OPEN

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1818 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 B1818 RAM Code

1. What are the common symptoms of OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

The common symptoms include the door ajar warning light staying illuminated, interior lights not turning off, and possible issues with power door locks.

2. What are the possible causes of the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

The code may be triggered by a faulty door ajar switch, damaged wiring in the door jamb, a malfunctioning body control module (BCM), or a short circuit in the door ajar circuit.

3. How can I diagnose the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

Diagnosing the issue involves visually inspecting the door ajar switch and wiring harness, testing the switch for continuity, and using a multimeter to check for voltage irregularities in the circuit.

4. Can I drive my vehicle with the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to prevent draining the battery or other electrical malfunctions.

5. How can I repair the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

Repair options include replacing the faulty door ajar switch, repairing or replacing damaged wiring, resetting the BCM, or addressing any short circuits in the system.

6. Is it possible to reset the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short without repairs?

While clearing the code may temporarily turn off the warning light, it is crucial to address the underlying issue to prevent further electrical problems in the vehicle.

7. Can extreme weather conditions cause the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

Extreme temperatures or moisture can potentially damage the door ajar switch or wiring, leading to the circuit short and triggering the fault code.

8. Are there any preventative measures to avoid the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

Regularly checking the door ajar switches and wiring for damage, keeping the door seals clean and lubricated, and addressing any issues promptly can help prevent this code from appearing.

9. How long does it typically take to repair the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short?

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 I use a diagnostic scanner to clear the OBDII code B1818 RAM for Rear Passenger Door Ajar Circuit Short myself?

Yes, a diagnostic scanner can be used to clear the code, but it is important to ensure that the underlying issue is resolved to prevent the code from reappearing.