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Engine-Codes – RAM – B1668 RAM

B1668 RAM Code - Reverse Lamp Control Circuit High

Quick Answer

The B1668 diagnostic trouble code (DTC) refers to an issue with the Reverse Lamp Control Circuit being detected as high. Common causes include Faulty reverse light switch, Wiring harness issues, Blown fuse in the reverse light circuit. 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
B1668 RAM indicates Reverse Lamp Control Circuit High.
Common causes
Common causes include Faulty reverse light switch, Wiring harness issues, Blown fuse in the reverse light circuit.
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 Sep 10, 2024
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Code B1668 RAM Description

The B1668 diagnostic trouble code (DTC) refers to an issue with the Reverse Lamp Control Circuit being detected as high. In simpler terms, it means that there is a problem with the circuit responsible for controlling the reverse lights on the vehicle. When this code is triggered, it indicates that the powertrain control module (PCM) has detected a voltage signal that is higher than the specified threshold for the reverse lamp control circuit.

OBDII Code B1668 RAM - Reverse Lamp Control Circuit High
B1668 RAM Code - Reverse Lamp Control Circuit High

Common Causes of B1668 RAM

  1. Faulty reverse light switch
  2. Wiring harness issues
  3. Blown fuse in the reverse light circuit
  4. Malfunctioning PCM
  5. Short circuit in the reverse light circuit

Symptoms of B1668 RAM

  1. Reverse lights staying on constantly
  2. Reverse lights not turning on when the vehicle is in reverse
  3. Transmission shifting erratically
  4. Vehicle failing to pass emissions test due to malfunctioning reverse lights

How to Fix B1668 RAM

  1. Begin by inspecting the reverse light switch and wiring harness for any visible damage or corrosion.
  2. Check the fuse for the reverse light circuit and replace if necessary.
  3. Use a multimeter to test the voltage at the reverse light switch and along the circuit to identify any abnormalities.
  4. Replace the reverse light switch if it is found to be faulty, and repair any damaged wiring or connections.
  5. Clear the DTC using a scan tool and test the reverse lights to ensure they are functioning correctly.

Cost to Fix B1668 RAM

The cost of repairing a B1668 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the repair cost for this type of issue can range from $100 to $300, including parts and labor. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to obtain a quote from a reputable auto repair shop before proceeding with the repair.

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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 B1668 RAM Code

1. What are the common symptoms of OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

The common symptoms of code B1668 include the reverse lights staying on constantly, even when the vehicle is not in reverse gear.

2. What causes the OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

The code B1668 is typically caused by a faulty reverse lamp switch, a short circuit in the wiring, or a problem with the Body Control Module (BCM).

3. How can I diagnose the OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

Diagnosing code B1668 involves checking the reverse lamp switch, inspecting the wiring for any shorts or damage, and testing the BCM for proper functionality using a diagnostic scan tool.

4. Can I continue driving with the OBDII code B1668 RAM (Reverse Lamp Control Circuit High) present?

While driving with code B1668 may not pose an immediate safety risk, it is recommended to address the issue promptly to avoid potential electrical problems or safety hazards due to malfunctioning reverse lights.

5. How can I repair the OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

Repairing code B1668 typically involves replacing the faulty reverse lamp switch, repairing any damaged wiring, or reprogramming the BCM if needed.

6. Is it possible to reset the OBDII code B1668 RAM (Reverse Lamp Control Circuit High) without repairing the issue?

Resetting the code without addressing the underlying issue will likely result in the code reappearing once the vehicle is driven and the problem is detected again.

7. Are there any DIY tips for fixing the OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

While some simple wiring checks can be done by DIY enthusiasts, diagnosing and repairing code B1668 may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

8. Can extreme weather conditions cause the OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

Extreme weather conditions can potentially cause electrical issues that may trigger code B1668, such as water damage to wiring or components, so it's important to ensure proper weatherproofing of the vehicle's electrical system.

9. How long does it typically take to repair the OBDII code B1668 RAM (Reverse Lamp Control Circuit High)?

The repair time for code B1668 can vary depending on the specific cause of the issue, but it may take anywhere from 1 to 3 hours for a professional mechanic to diagnose and fix the problem.

10. Can I prevent the OBDII code B1668 RAM (Reverse Lamp Control Circuit High) from occurring in the future?

Regularly inspecting the vehicle's electrical system, including the reverse lamp circuit, and addressing any issues promptly can help prevent code B1668 from occurring in the future.

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