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2018 Model 3 "Reduced Power" Warning and Limp Mode

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Ryan M. · rep 0 · May 22, 5:18 AM · 1 replies · solved · Question

Vehicle: 2018 Tesla Model 3 Long Range

Hey everyone,

My 2018 Tesla Model 3 Long Range suddenly displayed a "Reduced Power" warning on the screen while I was driving yesterday. The car immediately felt sluggish, like it went into a limp mode. I couldn't accelerate properly, and it felt pretty unsafe.

I managed to get it home, but the warning is still there. I've tried a soft reset (holding both scroll wheels) but it didn't clear the message. Has anyone experienced this with their Model 3? What could be causing this sudden power reduction?

I'm worried about driving it again. Any advice on what I should check or if this is a common issue?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:18 AM

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ClearTheCode admin answer:

Experiencing a "Reduced Power" warning and limp mode in your Tesla can be concerning. This typically indicates the vehicle's onboard computer has detected an issue that requires limiting performance to prevent further damage.

Here are common causes and steps you can take:

  1. Check 12V Battery: While Teslas are electric, they still rely on a traditional 12V battery for powering control systems. A weak or failing 12V battery can cause a myriad of seemingly unrelated errors, including power limitations. You might need to have it tested or replaced.
  2. Software Glitch: Sometimes, a deep software glitch can trigger these warnings. Try a full power cycle: park the car, ensure it's off, and leave it for a few minutes before restarting. If the issue persists after a soft reset, a full power cycle might be necessary.
  3. Drive Unit or Inverter Issue: The drive unit (motor) or its associated inverter could be experiencing a fault. This could range from a sensor malfunction to an internal component failure. These issues often trigger specific internal diagnostic codes.
  4. Battery Management System (BMS) Fault: The high-voltage battery pack's management system is crucial. If the BMS detects an imbalance, overheating, or another critical fault within the battery, it will limit power to protect the pack.
  5. High Voltage Contactor Issues: Less common, but issues with the main high-voltage contactors that connect the battery to the rest of the powertrain can also cause power limitations.

When to See a Shop:

  • If the "Reduced Power" warning persists after a soft reset and a full power cycle.
  • If you notice any unusual noises, smells, or other symptoms accompanying the warning.
  • If the vehicle is unsafe to drive due to severe power limitation.

It's highly recommended to schedule a service appointment with Tesla as soon as possible. They have proprietary diagnostic tools to read the specific internal error codes and pinpoint the exact cause of the problem. Driving with a persistent "Reduced Power" warning could potentially lead to further damage.

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