C1702 — Right Rear Sensor Circuit Short to Vbat #

The label for this diagnostic trouble code (DTC) may vary depending on the vehicle manufacturer.

• Right Rear Wheel Speed Sensor Circuit Short to Battery (Nissan, Infiniti)
• RR Sensor Circuit Short to Vbat (Mazda, Ford, Kia)
• Right Rear ABS Sensor Circuit High Input (Hyundai, Toyota)

Summary of DTC C1702 #

The C1702 code indicates a problem with the right rear wheel speed sensor circuit, specifically a short to Vbat (vehicle battery voltage). This means the vehicle’s electronic control module (ECM) or anti-lock braking system (ABS) controller detects higher-than-expected voltage on the right rear wheel speed sensor wiring. Wheel speed sensors are critical for systems like ABS and traction control, as they monitor each wheel’s rotational speed. If the circuit is shorted to battery voltage, the sensor can’t relay accurate data, potentially disabling safety features. This code is commonly triggered by wiring issues, damaged sensors, or connector problems.

Common Symptoms for DTC C1702 #

When C1702 is present, you’ll likely notice a few telltale signs. The most prominent is the illumination of the ABS warning light, signaling that something’s up with your brake system’s safety net. You may also experience changes in how your ABS or traction control behaves—sometimes, these systems might even turn off for safety reasons. In rare cases, your vehicle’s braking distances could increase if you brake hard on slippery surfaces.

• ABS warning light illuminated on the dashboard
• Traction control or stability control light may appear
• Loss of ABS function (anti-lock brakes disabled)
• Possible loss of traction or stability control assistance
• Intermittent or permanent warning chimes
• No noticeable symptoms in normal driving (but safety systems may be impaired)

Probable Causes of Code C1702 #

If your scan tool points to C1702, the underlying causes usually follow a predictable pattern. Most commonly, this code arises from wiring or connection issues, but it can also stem from sensor failure or, less frequently, module faults. Here’s how they stack up in terms of frequency:

1. Damaged or shorted wiring harness at the right rear wheel speed sensor
2. Corroded, loose, or contaminated electrical connectors at the sensor or ABS module
3. Faulty right rear wheel speed sensor (internally shorted)
4. Water intrusion causing electrical shorts
5. ABS control module malfunction (rare)

Step-by-Step Diagnosis for C1702 #

Diagnosing C1702 doesn’t have to feel like finding a needle in a haystack. With a systematic approach, you can zero in on the culprit quickly and safely. Here’s a proven method used by master technicians:

1. Verify the code and clear any stored DTCs. Test drive to see if the code returns.
2. Visually inspect the right rear wheel speed sensor and its wiring harness for obvious damage, abrasion, or disconnections.
3. Check the sensor’s electrical connector for corrosion, bent pins, or moisture.
4. With the ignition off, disconnect the sensor and measure resistance between the sensor pins using a multimeter (compare to OEM specifications).
5. Check for continuity or shorts between the sensor circuit and battery voltage using a multimeter (key off and on).
6. If wiring checks out, swap the right rear sensor with another wheel (if possible) and see if the code follows the sensor.
7. Inspect the ABS module connector and wiring for signs of water intrusion or damage.
8. If all checks pass, suspect an internal ABS module issue or intermittent wiring fault.

Possible Repairs for C1702 #

Once you identify the root cause of C1702, here’s how you might resolve it. Each fix corresponds directly to the probable causes listed above, so start with the most likely and work your way down:

• Repair or replace damaged wiring harness at the right rear wheel speed sensor
• Clean, tighten, or replace corroded connectors at the sensor or ABS module
• Replace the right rear wheel speed sensor if it fails resistance or continuity tests
• Address water intrusion by drying connectors, resealing, and using dielectric grease
• Replace the ABS control module (only after all other causes are ruled out and per OEM procedures)

Is It Safe to Drive With Code C1702? #

Driving with C1702 is possible but not recommended for extended periods. Here’s why: while your normal braking system will still work, critical safety features like ABS and traction control may be disabled. This means in slippery or emergency situations, your vehicle could skid or lose stability, increasing the risk of an accident. Have the issue diagnosed and repaired promptly to restore full safety functionality.

Vehicles Most Commonly Affected by C1702 #

While C1702 can appear on any vehicle equipped with ABS and advanced wheel speed sensing, certain makes and models are more frequently associated with this code due to design or component vulnerability. These include:

• Nissan Altima, Maxima, Rogue (2005–2020)
• Infiniti G35, QX56, FX35 (2005–2017)
• Mazda 3, Mazda 6, CX-5 (2010–2020)
• Ford Escape, Fusion (2012–2019)
• Kia Sorento, Sportage (2010–2021)
• Hyundai Sonata, Tucson (2011–2020)

Common Mistakes & Best Practices with C1702 #

It’s easy to trip up when tackling a wheel speed sensor code. Here are some pitfalls to avoid and tips to ensure a smooth repair:

• Replacing the sensor before checking wiring/connectors—many faults are wiring-related, not sensor failure.
• Overlooking water intrusion or corrosion at connectors, especially in wet climates.
• Not clearing codes after repairs, which may leave the ABS warning light on.
• Forgetting to verify the repair with a test drive and scan tool check.
• Using non-OEM parts that don’t match original specifications, leading to recurring issues.

Quick FAQ for C1702 #

Even seasoned technicians and curious drivers have questions about this code. Here are some answers to the most common ones:

• Q: Can I just reset the code to turn off the ABS light?
  A: Clearing the code without addressing the cause will only turn the light off temporarily. The problem (and the code) will return as soon as the system detects the fault again.
• Q: Is it expensive to fix C1702?
  A: Repairs can range from a simple wire repair (inexpensive) to sensor replacement or, rarely, an ABS module replacement (more costly). Most C1702 fixes are affordable if addressed early.