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2018 Q50 ABS and VDC Lights On - Rough Braking

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Diana O. · rep 0 · May 22, 5:06 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti Q50 3.0t Luxe

Hey everyone, hoping for some insight here. I've got a 2018 Infiniti Q50 3.0t Luxe, and recently the ABS and VDC (Vehicle Dynamic Control) warning lights have come on simultaneously on my dashboard.

When this happens, the braking feels a bit off, almost like the ABS is trying to engage at low speeds even when it shouldn't, or sometimes it just feels rougher than usual. There's no obvious fluid leak or grinding noise, but the pedal feel is definitely different.

I'm wondering if this is a common issue with these Q50s? Could it be something simple like a wheel speed sensor, or am I looking at a more serious ABS module problem? Any advice on what to check first would be greatly appreciated before I take it to the shop.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:06 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a common issue that triggers both the ABS and VDC warning lights on your 2018 Infiniti Q50. These systems are interconnected, so a fault in one often affects the other.

Here are the most common causes and troubleshooting steps:

  1. Wheel Speed Sensors: This is the most frequent culprit. Each wheel has a sensor that monitors its rotational speed. If one fails, becomes dirty, or its wiring is damaged, the ABS/VDC system loses crucial data, triggering the lights. A common OBD-II code for this would be in the C-series, such as C1101 (Right Front Wheel Speed Sensor), C1102 (Left Front Wheel Speed Sensor), C1103 (Right Rear Wheel Speed Sensor), or C1104 (Left Rear Wheel Speed Sensor).
  2. ABS Module Failure: While less common than a sensor issue, the ABS control module itself can fail. This is a more expensive repair. Symptoms might include erratic braking behavior, a firm pedal, or no ABS function at all.
  3. Brake Fluid Level/Pressure: Although less likely to trigger both lights without other symptoms, extremely low brake fluid can affect system pressure. However, this usually triggers a separate brake warning light.
  4. Wiring Issues: Damaged or corroded wiring to the wheel speed sensors or the ABS module can also cause intermittent or permanent faults.

When to see a shop:

  • Immediate Action: If your braking performance feels significantly compromised, or if the pedal feels spongy or excessively hard, do not delay. Drive cautiously to the nearest reputable repair shop.
  • Diagnostic Scan: The first step for any professional will be to connect an advanced diagnostic scanner to read the specific C-codes stored in the ABS module. This will pinpoint the exact sensor or circuit that is malfunctioning.
  • Inspection: A technician will visually inspect the wheel speed sensors, their wiring harnesses, and the ABS module for any signs of damage, corrosion, or loose connections.
  • Component Replacement: Depending on the diagnosis, the faulty wheel speed sensor, wiring, or in rarer cases, the ABS module itself will need to be replaced.

Ignoring these warning lights can compromise your vehicle's safety features, especially in emergency braking or slippery conditions. It's best to address this promptly.

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