The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2021 Chrysler 300S Headlight Flickering and Random Electrical Glitches

0

Mike T. · rep 0 · May 25, 4:24 AM · 1 replies · solved · Question

Vehicle: 2021 Chrysler 300S

My 2021 Chrysler 300S has developed some really strange electrical problems. The headlights, particularly the LED DRLs, will sometimes flicker noticeably while driving. It's not constant, but it's happening more often.

On top of that, I've had a few instances where random warning lights briefly flash on the dash (like ABS or Traction Control), and once the wipers even cycled on their own for a second. It feels like there's some kind of electrical short or bad ground somewhere. Has anyone experienced similar widespread electrical weirdness in their newer 300? What could be the culprit here?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:24 AM

0

ClearTheCode admin answer:

Random electrical glitches like flickering lights and spurious warning messages often point to a foundational electrical issue rather than multiple individual component failures. This could be a grounding problem, voltage irregularity, or a fault within a central control module.

  1. Battery and Alternator Check: Start with the basics. Have your vehicle's 12V battery and alternator tested. A weak battery or an alternator that's failing to maintain consistent voltage can cause all sorts of electrical gremlins in modern, highly computerized vehicles.
  2. Inspect Battery Terminals and Grounds: Visually inspect both battery terminals for corrosion and ensure they are tightly secured. Also, check major ground points on the chassis and engine block. Loose or corroded ground connections can cause erratic electrical behavior as modules struggle to get a stable reference voltage.
  3. Check for OBD-II Codes: Even if the warning lights flash briefly, the Body Control Module (BCM) or other modules might store 'history' codes. Use an advanced scanner to check for codes in all modules, not just the engine. Look for codes related to undervoltage, communication errors (U-codes), or specific module faults.
  4. Wiring Harness Inspection: While difficult for a DIYer, sometimes a damaged or pinched wiring harness can cause intermittent shorts or open circuits. Pay attention to areas where wiring passes through firewalls or near moving parts.
  5. Module Issues: The Body Control Module (BCM) or Totally Integrated Power Module (TIPM – though less prevalent in newer models, its functions are still integrated) controls many of these systems. A failing BCM could be sending incorrect signals or experiencing internal faults.

Common Causes:

  • Weak or failing vehicle battery.
  • Faulty alternator or voltage regulator.
  • Loose or corroded ground connections.
  • Intermittent short circuits in wiring.
  • Failing Body Control Module (BCM).

When to See a Shop: Given the widespread and intermittent nature of these issues, it's highly recommended to take your 2021 Chrysler 300S to a Chrysler dealership or a specialist automotive electrical shop. Diagnosing such problems requires specialized diagnostic tools (like WiTech) to monitor live data from various modules and accurately pinpoint the source of voltage fluctuations or communication errors. Trying to chase down an intermittent electrical fault without the right equipment can be very time-consuming and frustrating.

Menu

Help & account