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2019 Pacifica Battery Draining Fast & Charging Light On

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

Vehicle: 2019 Chrysler Pacifica Touring

My 2019 Chrysler Pacifica Touring has been acting up lately. The battery seems to drain overnight, and the "Battery" light on the dash comes on intermittently while driving. I've had to jump-start it a few times this week. I replaced the battery about a year ago, so I'm wondering if it's the alternator or something else.

Could a parasitic draw be causing this, or is it more likely an issue with the charging system itself? I'm trying to avoid an expensive diagnostic if it's something I can check myself.

Any ideas or common problems with the Pacifica's electrical system that might explain this?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

This sounds like a classic charging system or parasitic draw issue. Given that the battery light is coming on, the charging system is the primary suspect.

Possible Causes:

  1. Failing Alternator: Even if the battery is relatively new, a weak or failing alternator won't properly recharge it, leading to a drained battery and the dashboard warning light.
  2. Parasitic Draw: Something in the vehicle is staying on and drawing power even when the car is off. Common culprits include faulty modules (e.g., infotainment, body control module), glove box lights, or aftermarket accessories.
  3. Battery Terminal Corrosion/Loose Connections: While less likely if the battery was recently replaced, always check for clean, tight connections at the battery terminals.
  4. Faulty Battery (rare but possible): A new battery can still be defective.
  5. Wiring Issues: Damaged or corroded wiring in the charging circuit can cause intermittent problems.

Diagnostics & Next Steps:

  1. Check Battery Voltage: With the engine off, the battery should read around 12.6V. With the engine running, it should be between 13.5V and 14.7V. If it's not, the alternator isn't charging properly.
  2. OBD-II Scan: A diagnostic scan might reveal codes related to the charging system, such as:
    • P0562: System Voltage Low
    • P0622: Generator Field Control Circuit Malfunction
    • P0625: Generator Field Terminal Circuit Low
  3. Perform a Parasitic Draw Test: This involves connecting a multimeter in series with the battery's negative terminal and checking for current draw when the car is off. You'll then pull fuses one by one to isolate the circuit causing the draw. This can be time-consuming but effective.
  4. Inspect Alternator Wiring: Look for any frayed, corroded, or loose wires connected to the alternator.

When to See a Shop:

If basic checks confirm a charging system issue (low voltage with the engine running) or if you're uncomfortable performing a parasitic draw test, it's best to take your Pacifica to a qualified mechanic. A failing alternator needs to be replaced, and complex parasitic draws can be difficult to diagnose without specialized tools and expertise. Continuing to drive with a faulty charging system can leave you stranded or damage other electrical components.

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