C1704 — Right Rear Sensor Circuit Fault #

The code label may vary depending on the vehicle manufacturer.

• Right Rear Wheel Speed Sensor Circuit Malfunction (Nissan)
• RR Sensor Circuit Failure (Toyota, Lexus)
• Right Rear ABS Sensor Circuit Fault (Ford)
• Right Rear Wheel Sensor Electrical Issue (Kia, Hyundai)

Summary for code C1704 #

C1704 is a diagnostic trouble code (DTC) that indicates a detected fault in the electrical circuit associated with the right rear wheel speed sensor. This sensor is a crucial component of the Anti-lock Braking System (ABS), which helps regulate brake pressure to prevent wheel lockup during sudden or hard braking. When the vehicle’s ABS control module (the computer overseeing brake safety functions) identifies an irregularity—such as an open, short, or erratic signal—from the right rear sensor circuit, it will trigger the C1704 code. Depending on the OEM (Original Equipment Manufacturer), the precise wording may change, but the essential meaning remains the same: something’s wrong with the electrical path to or from the right rear wheel speed sensor. Prompt diagnosis is recommended, as your ABS and related safety features may be affected.

Frequent symptoms for code C1704 #

When your vehicle logs a C1704 code, you’ll often notice that some safety and handling aids aren’t operating as expected. Imagine your car’s ABS as a vigilant co-pilot—if it loses sight of one wheel, it can’t guide you safely in slippery conditions. Here are the most common symptoms:

• ABS warning light illuminated on the dashboard
• Traction control or stability control warning lights
• Loss of anti-lock braking function (wheels may lock during hard braking)
• Unusual braking behavior or noises
• Intermittent or persistent warning chimes

Probable causes for code C1704 #

The electrical circuit for a wheel speed sensor is exposed to the elements and frequent movement. Over time, connections can loosen, wires may break, or the sensor itself may fail. Here’s what typically triggers this code, listed from most to least frequent:

1. Damaged or corroded sensor wiring/connectors: Moisture, salt, and road debris can damage the wiring harness or corrode the electrical terminals.
2. Faulty right rear wheel speed sensor: The sensor element can fail due to age, impact, or internal short circuits.
3. Loose or disconnected sensor plug: Vibration or impact can cause the connector to back out, interrupting the signal.
4. Electrical short or open circuit in the harness: Pinched, cut, or broken wires can disrupt communication.
5. Malfunctioning ABS control module (rare): The module itself may fail to interpret the sensor signal.

Step-by-step diagnosis for code C1704 #

Diagnosing a C1704 code is a methodical process, much like following a map through a forest—you want to check each path before moving on. Here’s how a technician would typically approach it:

• Verify the code with a professional scan tool and check for related codes.
• Visually inspect the right rear wheel speed sensor and its wiring for visible damage, disconnections, or corrosion.
• Unplug the sensor and check the connector for bent pins, corrosion, or moisture.
• Test the resistance of the sensor with a multimeter (refer to OEM specifications for correct values).
• Check the sensor circuit continuity between the sensor and the ABS control module.
• If all wiring and the sensor appear serviceable, use a scan tool to monitor real-time wheel speed sensor data while spinning the wheel by hand.
• If still unresolved, check for software updates or faults in the ABS control module itself.

Possible repairs for code C1704 #

Once the root cause is identified, repair is usually straightforward. Think of it as patching up the weak link in a chain—fix the break, and the system regains its strength. Typical repairs include:

• Repairing or replacing damaged or corroded wiring and connectors
• Installing a new right rear wheel speed sensor
• Cleaning and securing the sensor connector
• Repairing or replacing the ABS module (rare and only after all other options are exhausted)
• Clearing the code and performing a road test to confirm repair

Is it safe to drive with code C1704? #

Driving with a C1704 code is possible, but caution is advised. Your basic brakes will still function because the hydraulic system operates independently of the ABS. However, anti-lock braking, traction control, and stability control systems may be disabled. This means you’re at higher risk of wheel lockup or loss of control in slippery or emergency situations. If you must drive, do so with extra caution, and avoid aggressive braking. Ideally, have your vehicle inspected and repaired as soon as possible to restore full safety features.

Vehicles most commonly affected by code C1704 #

While C1704 is a generic (non-manufacturer-specific) code, some brands and models report it more frequently, particularly those using similar wheel speed sensor designs. Here are examples of vehicles where this code is often seen:

• Nissan Altima, Maxima, Rogue
• Toyota Camry, Highlander, RAV4
• Ford F-150, Explorer, Escape
• Kia Sorento, Forte, Optima
• Hyundai Sonata, Santa Fe, Elantra

Common mistakes and best practices for code C1704 #

Misdiagnosis can lead to unnecessary repairs and headaches. Many times, the issue is a simple wiring problem rather than a failed sensor. Here’s what to avoid—and what to do instead:

• Don’t replace the sensor without checking the wiring first.
• Don’t ignore connector corrosion or water intrusion—clean and dry thoroughly.
• Always clear the code after repair and verify that it does not return.
• Use OEM (Original Equipment Manufacturer) parts when possible for best reliability.
• Double-check related codes that might point to a larger system issue.

Quick FAQ for code C1704 #

Here are answers to the most common questions about this code:

• Q: Can a worn wheel bearing cause C1704?
  A: Indirectly, yes. Excessive play in the wheel bearing can affect the sensor’s ability to read the wheel’s rotation, triggering a circuit fault. However, the primary cause is usually electrical.
• Q: Do I need special tools to fix this code?
  A: For diagnosis, you’ll need a basic multimeter and ideally an OBD-II scan tool. Repairs may require simple hand tools and, sometimes, a replacement sensor.