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2016 Model X 90D - Inconsistent Regen Braking and occasional 'jerkiness'

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Mike T. · rep 0 · May 25, 4:00 AM · 1 replies · solved · Question

Vehicle: 2016 Tesla Model X 90D

Hi everyone,

I've been experiencing some really inconsistent regenerative braking in my 2016 Model X 90D. Sometimes it feels strong and smooth, but other times it's much weaker, almost like it's not engaging properly, even when the battery isn't full or cold. This has led to a few moments where the car felt 'jerky' or like it wasn't slowing down as expected, especially when lifting off the accelerator.

I've got about 80,000 miles on the odometer. I'm concerned this could be a drivetrain issue affecting the motor's ability to regenerate power, or perhaps a sensor problem. Has anyone else with an older Model X noticed this kind of behavior?

Any insights or similar experiences would be helpful. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:00 AM

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ClearTheCode admin answer:

Inconsistent regenerative braking and a 'jerky' feeling in your 2016 Tesla Model X 90D can be concerning, as regen braking is a core part of the Tesla driving experience and affects both efficiency and safety. This issue can stem from several areas within the drivetrain and control systems.

Here's an overview of potential causes and recommended actions:

  1. Understanding Regenerative Braking: Regen braking relies on the electric motors acting as generators to slow the vehicle and send energy back to the battery. Its effectiveness can be influenced by battery state of charge (full battery limits regen), battery temperature (cold battery limits regen), and software settings.

  2. Potential Causes for Inconsistency:

    • Drive Unit/Motor Control Issues: Problems with the motor's ability to switch effectively between propulsion and generation modes, or issues with the inverter controlling this process, can lead to inconsistent regen.
    • Brake Pedal Position Sensor/Switch: While regen is primarily controlled by lifting off the accelerator, the vehicle's computer still monitors the brake pedal. A faulty sensor here could cause unexpected behavior if the car thinks you're applying the friction brakes when you're not, or vice versa.
    • Accelerator Pedal Position Sensor: An inconsistent signal from the accelerator pedal could confuse the system about your desired input, leading to erratic regen.
    • Software Glitch: Sometimes, a software bug can cause temporary inconsistencies in how the vehicle interprets driver input or manages power flow. Ensure your car is on the latest software version.
    • Battery Degradation/BMS Issues: While a full battery limits regen, if the Battery Management System is misreporting battery capacity or health, it could prematurely limit regen.
    • Internal Diagnostic Codes: Look for alerts like DRV_REG_003 (Regen Performance Degradation), ACCEL_SEN_001 (Accelerator Sensor Fault), or BRAKE_SEN_002 (Brake Sensor Anomaly).

  3. When to See a Shop:

    • Promptly, Especially if Safety is Affected: If the inconsistency is severe enough to affect your ability to safely control the vehicle's deceleration, or if you feel it could lead to an accident, schedule service immediately.
    • For Diagnosis: Even if it's minor, persistent inconsistent regen warrants a visit to Tesla Service. They can run diagnostics to check sensor readings, motor performance, and software integrity. This is not a typical wear-and-tear item and usually indicates an underlying system fault.

Ensure your tire pressures are correct, as uneven tire wear can sometimes subtly affect driving dynamics, though it's less likely to be the primary cause of regen issues.

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