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B2874 Chrysler Code - Right Reverse Lamp 2 Control Circuit Short

Quick Answer

The B2874 diagnostic trouble code (DTC) indicates a fault in the Right Reverse Lamp 2 Control Circuit, specifically a short circuit condition. Common causes include Damaged Wiring: Frayed or damaged wires in the reverse lamp circuit can create a short circuit, Corroded Connectors: Corrosion at the connectors can lead to poor electrical connections, causing shorts, Faulty BCM: A malfunctioning body control module may incorrectly interpret signals, leading to erroneous DTCs. 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
B2874 Chrysler indicates Right Reverse Lamp 2 Control Circuit Short.
Common causes
Common causes include Damaged Wiring: Frayed or damaged wires in the reverse lamp circuit can create a short circuit, Corroded Connectors: Corrosion at the connectors can lead to poor electrical connections, causing shorts, Faulty BCM: A malfunctioning body control module may incorrectly interpret signals, leading to erroneous DTCs.
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 Oct 01, 2024
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Code B2874 Chrysler Description

The B2874 diagnostic trouble code (DTC) indicates a fault in the Right Reverse Lamp 2 Control Circuit, specifically a short circuit condition. This code is specific to Chrysler vehicles and is part of the body control module (BCM) diagnostics. The reverse lamps are crucial for safety, as they illuminate when the vehicle is in reverse, alerting pedestrians and other drivers of the vehicle's movement. A short circuit in this control circuit can lead to the reverse lamps either not functioning at all or remaining illuminated continuously, which can confuse other drivers and pose a safety risk.

OBDII Code B2874 Chrysler - Right Reverse Lamp 2 Control Circuit Short
B2874 Chrysler Code - Right Reverse Lamp 2 Control Circuit Short

Common Causes of B2874 Chrysler

  1. Damaged Wiring: Frayed or damaged wires in the reverse lamp circuit can create a short circuit.
  2. Corroded Connectors: Corrosion at the connectors can lead to poor electrical connections, causing shorts.
  3. Faulty BCM: A malfunctioning body control module may incorrectly interpret signals, leading to erroneous DTCs.
  4. Water Intrusion: Moisture entering the electrical system can cause shorts and corrosion, particularly in the reverse lamp circuit.
  5. Aftermarket Modifications: Improperly installed aftermarket lighting or accessories can interfere with the existing wiring and cause shorts.

Symptoms of B2874 Chrysler

  1. Inoperative Reverse Lights: The right reverse lamp may not illuminate when the vehicle is shifted into reverse.
  2. Constantly Illuminated Reverse Light: The reverse light may remain on even when the vehicle is not in reverse, indicating a short circuit.
  3. BCM Warning Light: The vehicle's dashboard may display a warning light indicating a fault in the lighting system.
  4. Intermittent Electrical Issues: Other electrical components may exhibit erratic behavior due to the short circuit affecting the BCM.
  5. Increased Battery Drain: A continuous short circuit can lead to excessive battery drain, requiring more frequent jump-starts or battery replacements.

How to Fix B2874 Chrysler

  1. Visual Inspection: Begin with a thorough visual inspection of the wiring and connectors associated with the right reverse lamp circuit for any signs of damage or corrosion.
  2. Test the Circuit: Use a multimeter to check for continuity and voltage in the reverse lamp circuit, identifying any shorts or breaks in the wiring.
  3. Repair or Replace Wiring: If damaged wiring is found, repair or replace the affected sections to restore proper circuit integrity.
  4. Inspect the BCM: If no wiring issues are detected, test the BCM for faults and replace it if necessary.
  5. Clear Codes and Test: After repairs, clear the DTCs using a scan tool and perform a test drive to ensure the reverse lamps function correctly and the code does not reappear.

Cost to Fix B2874 Chrysler

The typical repair costs for addressing the B2874 code can vary widely based on the specific issue identified during diagnosis. On average, repairs can range from $100 to $500, depending on whether it involves simple wiring repairs or a more complex BCM replacement. Labor costs can vary significantly; most auto repair shops charge between $80 and $150 per hour. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It's advisable to check local rates for a more precise estimate. Additionally, diagnostic time may add to the overall cost, as technicians will need to spend time identifying the specific cause of the issue before proceeding with repairs.

What does this mean?

Tech Notes for B2874 Chrysler

B2874-11 RIGHT REVERSE LAMP 2 CONTROL CIRCUIT SHORT TO GROUND

B2874-15 RIGHT REVERSE LAMP 2 CONTROL CIRCUIT SHORT TO BATTERY OR OPEN

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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 B2874 Chrysler Code

1. What does the OBDII code B2874 mean on a Chrysler?

The code B2874 indicates a problem with the Right Reverse Lamp 2 Control Circuit, specifically a short to ground, power, or an open circuit.

2. What are common symptoms of the B2874 code?

Symptoms may include the right reverse lamp not illuminating, a warning light on the dashboard, or issues with the vehicle's reverse lighting system.

3. What causes the B2874 code to appear?

Common causes include damaged wiring, corroded connectors, a faulty reverse lamp bulb, or a malfunctioning Body Control Module (BCM).

4. How do I diagnose the B2874 code?

Start by inspecting the right reverse lamp, its wiring, and connectors for damage or corrosion. Use a multimeter to check for continuity and shorts in the circuit.

5. Can I drive my Chrysler with the B2874 code active?

While the vehicle is generally safe to drive, the reverse lights may not work properly, reducing visibility and safety when reversing.

6. How can I fix the B2874 code?

Repairs may include replacing a faulty bulb, repairing or replacing damaged wiring, cleaning corroded connectors, or, in rare cases, replacing the BCM.

7. How much does it cost to fix the B2874 code?

The cost depends on the specific issue, ranging from a few dollars for a bulb replacement to several hundred dollars for wiring repairs or BCM replacement.

8. Can a blown fuse cause the B2874 code?

Yes, a blown fuse in the reverse lamp circuit can cause the code by interrupting power to the right reverse lamp.

9. Will clearing the B2874 code fix the problem?

Clearing the code will only reset the warning temporarily. The underlying issue must be resolved to prevent the code from returning.

10. Do I need a professional mechanic to fix the B2874 code?

If you’re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it yourself. Otherwise, consult a professional mechanic for assistance.

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