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Electronic Parking Brake Warning on 2020 Nautilus

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Mike T. · rep 0 · May 25, 4:29 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Nautilus Reserve

Hey everyone,

I'm having an issue with my 2020 Lincoln Nautilus Reserve. The electronic parking brake (EPB) warning light has come on, and sometimes it struggles to engage or disengage. A couple of times, it wouldn't release at all, and I had to cycle the ignition a few times before it finally let go. Other times, it engages fine but the light stays on.

I'm worried about getting stuck. Has anyone experienced this with their Nautilus? Is there a common fix or something I can check myself before taking it to the dealership? I'm not seeing any other warning lights, just for the EPB.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:29 AM

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ClearTheCode admin answer:

An intermittent electronic parking brake (EPB) warning and malfunction on your 2020 Lincoln Nautilus is a common concern for vehicles equipped with this system. It can definitely be unsettling when the parking brake doesn't behave as expected.

Here are the most likely causes and recommended steps:

  1. EPB Actuator Motor Failure: The most common cause for these symptoms is a failing electric motor within the EPB caliper assembly. These motors can seize, become intermittent, or fail completely, preventing the parking brake from engaging or disengaging properly. This often triggers a fault code.
  2. Wiring or Connector Issues: Damage to the wiring harness leading to the EPB actuators or corroded/loose connectors can interrupt communication or power, leading to erratic operation and warning lights.
  3. EPB Control Module Fault: Less common, but a fault within the EPB control module itself could cause these issues. This module manages the EPB system.
  4. Low Battery Voltage: Sometimes, a weak 12V battery can cause various electronic systems, including the EPB, to behave erratically due to insufficient voltage during system checks or operation. This is usually accompanied by other electrical gremlins.

Common OBD-II Codes (may vary):

  • C1A55: Parking Brake Motor Circuit Fault
  • C0034: Left Rear Wheel Speed Sensor (if EPB relies on wheel speed data)
  • B1A84: Parking Brake Switch Fault

When to see a shop:

  • Immediate Attention: While you can often still drive the car, an unreliable parking brake is a safety concern, especially when parking on inclines. Get it checked soon.
  • Professional Diagnostics: You'll need a diagnostic scan tool (dealer-level or advanced aftermarket) to read the specific fault codes from the EPB module. Generic OBD-II scanners may not be able to access these manufacturer-specific codes.
  • Component Replacement: Based on the fault codes, the mechanic will likely recommend replacing the faulty EPB actuator/caliper assembly on the affected wheel(s). It's often recommended to replace them in pairs if one side fails due to similar wear.
  • Wiring Inspection: The technician will also inspect the wiring and connectors for any signs of damage or corrosion before condemning a module or actuator.
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