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2016 Sonata Sport - ABS & ESC Lights On, C1202 Code

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Mike T. · rep 0 · May 25, 1:59 AM · 1 replies · solved · Question

Vehicle: 2016 Hyundai Sonata Sport

Hello everyone,

I'm having an issue with my 2016 Hyundai Sonata Sport, with about 95,000 miles. Both the ABS warning light and the Electronic Stability Control (ESC) warning light have come on on my dashboard. They came on simultaneously.

I hooked up my scanner and it's pulling a C1202 code, which points to a 'Wheel Speed Sensor Front Left Circuit Malfunction'. Sometimes, my speedometer also acts a bit erratic, especially at lower speeds.

Is this a common problem for this generation of Sonata? What's involved in replacing a wheel speed sensor, and is it something I could tackle myself, or should I definitely take it to a shop? Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:59 AM

0

ClearTheCode admin answer:

The C1202 code (Wheel Speed Sensor Front Left Circuit Malfunction) is a very specific diagnostic trouble code that directly relates to your ABS and ESC lights being on. The erratic speedometer at low speeds is also a strong indicator, as the speedometer often relies on wheel speed sensor input.

  1. Understanding the Problem:

    • The wheel speed sensor monitors the rotational speed of each wheel and sends this data to the ABS control module. This information is crucial for the ABS (Anti-lock Braking System) and ESC (Electronic Stability Control) systems to function correctly.
    • When the control module detects an irregular signal or no signal from a specific sensor (in your case, the front left), it disables the related systems and triggers the warning lights.
    • A 'circuit malfunction' can mean the sensor itself is faulty, the wiring to the sensor is damaged, or the connection is poor.

  2. Common Causes for C1202:

    • Faulty Wheel Speed Sensor: The sensor itself can fail due to internal electrical issues, corrosion, or physical damage.
    • Damaged Wiring Harness: The wiring leading to the sensor can get chafed, cut, or corroded, especially where it's exposed near the wheel.
    • Corroded Connector: The electrical connector at the sensor or further up the harness can suffer from corrosion, leading to a poor connection.
    • Damaged Tone Ring/Reluctor Wheel: While less common for a 'circuit malfunction' code, a damaged or dirty tone ring (the toothed wheel the sensor reads) can also cause erratic readings.

  3. Diagnostic & Repair Steps:

    • Visual Inspection: Start by visually inspecting the front left wheel speed sensor and its wiring. Look for any obvious signs of damage, cuts, or corrosion on the wire and connector. Also, check for debris or damage to the tone ring.
    • Sensor Replacement: If the wiring looks good, the most common fix is to replace the faulty wheel speed sensor. It's typically held in place by one or two bolts and connects to a harness. This is often a DIY-friendly repair for those comfortable working under the car and removing the wheel.
    • Clear Codes: After replacement, clear the codes and test drive the vehicle to ensure the lights stay off and the speedometer functions correctly.

  4. When to See a Shop:

    • If, after replacing the sensor, the problem persists, indicating a deeper wiring issue or a problem with the ABS control module itself.
    • If you're uncomfortable working with vehicle components, especially brake-related systems.
    • If the visual inspection reveals extensive wiring damage that you're not equipped to repair.
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