AutoCodes – RAM – B2874 RAM

B2874 RAM Code - Right Reverse Lamp 2 Control Circuit Short

Quick Answer

The Body Control Module (BCM) receives a communication network message from the Steering Column Control Module (SCCM) requesting turn signal lamp illumination. Common causes include Faulty Right Rear Turn Lamp Driver, Right Rear Turn Lamp Driver harness is open or shorted, Right Rear Turn Lamp Driver 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: B2874 RAM indicates Right Reverse Lamp 2 Control Circuit Short.
Common causes: Common causes include Faulty Right Rear Turn Lamp Driver, Right Rear Turn Lamp Driver harness is open or shorted, Right Rear Turn Lamp Driver 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 703

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 Feb 18, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B2874 RAM Description

The Body Control Module (BCM) receives a communication network message from the Steering Column Control Module (SCCM) requesting turn signal lamp illumination. When this bus message is received, the BCM provides a pulsed voltage output through the rear turn signal control circuit. The rear turn signal control circuit connects to the Turn Signal Lamps. The Diagnostic Trouble Code (DTC) sets when the Body Control Module (BCM) detects a low condition on the Right Rear Turn Lamp Driver circuit.

OBDII Code B2874 RAM - Right Reverse Lamp 2 Control Circuit Short - AutoCodes.com — B2874 RAM Code - Right Reverse Lamp 2 Control Circuit Short

What does this mean?

What are the Possible Causes of the DTC B2874 RAM?

Faulty Right Rear Turn Lamp Driver
Right Rear Turn Lamp Driver harness is open or shorted
Right Rear Turn Lamp Driver circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B2874 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

B2874-11 RIGHT REVERSE LAMP 2 CONTROL CIRCUIT SHORT TO GROUND
B2874-15 RIGHT REVERSE LAMP 2 CONTROL CIRCUIT SHORT TO BATTERY OR OPEN

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2874 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 B2874 RAM Code

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

The B2874 code indicates a problem in the Right Reverse Lamp 2 Control Circuit, typically due to a short in the wiring or component failure.

2. What are the symptoms of a B2874 code on a RAM?

Symptoms include the right reverse lamp not functioning, dim or flickering light output, or a warning light on the dashboard.

3. What causes the B2874 code to appear?

Common causes include damaged wiring, a short circuit, a faulty bulb, a defective lamp housing, or a malfunctioning Body Control Module (BCM).

4. Can a bad bulb cause the B2874 code on a RAM?

Yes, a defective or improperly installed reverse lamp bulb can trigger the B2874 code.

5. How do I diagnose a B2874 code on my RAM vehicle?

Start by checking the reverse lamp bulb and socket for damage. Inspect wiring for shorts or corrosion, and use a multimeter to test the circuit.

6. Is the B2874 code serious?

While it wonâ€™t affect drivability, it can impair reverse lighting, which is a safety concern, especially at night or in low-visibility conditions.

7. How do I fix the B2874 code on a RAM?

Repair or replace damaged wiring, check and replace the bulb if needed, clean corroded connections, and reset the code with an OBDII scanner.

8. Can the B2874 code be cleared without fixing the issue?

You can clear the code temporarily with a scanner, but it will return if the underlying issue isnâ€™t resolved.

9. Could a faulty Body Control Module (BCM) cause the B2874 code?

Yes, although itâ€™s less common, a malfunctioning BCM could disrupt the reverse lamp circuit and trigger the code.

10. Do I need professional help to fix the B2874 code on my RAM?

If basic troubleshooting like replacing the bulb or repairing wiring doesnâ€™t resolve the issue, consulting a professional mechanic with electrical expertise is recommended.