The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2021 Ram 1500 Headlights Flickering and Intermittent

0

Mike T. · rep 0 · May 22, 3:34 AM · 1 replies · solved · Question

Vehicle: 2021 Ram 1500 Rebel

Hi all,

I've got a weird problem with my 2021 Ram 1500 Rebel. The headlights (LEDs) have started flickering intermittently, and sometimes one will even go out completely for a few seconds before coming back on. It's not just a dimming; it's a full-on flicker or temporary outage.

It happens randomly, sometimes on rough roads, sometimes just cruising on the highway. I've checked the connections I can see, and they seem fine. It's really concerning, especially driving at night.

Could this be a loose ground, a faulty headlight module, or something with the Body Control Module? Any ideas on what to check or if this is a known issue for the 2021 models?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:34 AM

0

ClearTheCode admin answer:

Flickering or intermittent headlights on a 2021 Ram 1500 Rebel, especially with LED units, can be a complex issue given the integrated nature of modern lighting systems. This isn't just a simple bulb replacement problem.

Common Causes for Headlight Issues:

  • Loose or Corroded Ground Connections: A common culprit for intermittent electrical problems. Poor grounds can cause voltage fluctuations.
  • Faulty Headlight Assembly/Module: The LED headlight units often contain integrated control modules. If one of these fails, it can cause flickering or outages.
  • Wiring Harness Damage: Frayed, pinched, or corroded wires in the headlight circuit.
  • Body Control Module (BCM) Issues: The BCM controls many electrical functions, including lighting. A fault here can send incorrect signals.
  • Voltage Regulator/Alternator Problems: While less common for isolated headlight issues, inconsistent voltage from the charging system can affect all electronics.

Troubleshooting Steps:

  1. Inspect Visible Wiring and Connectors: Carefully check the wiring harness leading to each headlight assembly for any signs of damage, fraying, or loose connections. Ensure the main connector to the headlight unit is securely seated.
  2. Check Battery and Charging System: Ensure your battery is healthy and the alternator is providing stable voltage (around 13.5-14.5V when running). Low or fluctuating voltage can cause issues.
  3. Look for Ground Points: While specific ground points can be hard to locate without a service manual, visually inspect any accessible ground straps or wires connected to the chassis near the headlights.
  4. Scan for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to check for B (Body) codes related to lighting. Examples might include:
    • B1000: Electronic Control Unit Malfunction (general BCM or module fault).
    • B1001: Lighting Control Module Fault (more specific to the headlight unit).
    • B1002: Headlamp Circuit Open/Short.

When to See a Shop:

  • If the issue persists after checking visible connections and the battery.
  • If you're getting specific BCM or lighting module DTCs.
  • If the problem is affecting both headlights or is becoming more frequent.
  • A dealership or an automotive electrical specialist will have advanced diagnostic tools to pinpoint internal headlight module faults, BCM issues, or hidden wiring problems that are difficult to access.
Menu

Help & account