C1700 — Left Rear Sensor Circuit Failure #

Note: The code label may vary depending on the vehicle manufacturer (OEM). Always refer to your service manual for precise terminology.

• Left Rear Wheel Speed Sensor Circuit Failure (Nissan, Infiniti)
• Left Rear ABS Sensor Circuit Malfunction (Toyota, Lexus)
• Left Rear Sensor Electrical Fault (Ford, Mazda)
• Left Rear Wheel Sensor Circuit Error (Subaru)

Summary of DTC C1700 #

DTC C1700 indicates an electrical problem within the circuit of the left rear wheel speed sensor. This sensor is a critical component in the Anti-lock Braking System (ABS), which monitors wheel rotation to optimize braking performance and maintain vehicle stability. When the control module detects an abnormal voltage, open, or short circuit in the left rear sensor wiring, it triggers this code. The issue may result from a faulty sensor, damaged wiring, or connector problems. Prompt diagnosis and repair help maintain optimal braking safety and prevent further system impairment.

Common Symptoms for DTC C1700 #

When C1700 is present, you may notice a range of symptoms affecting your driving safety and ABS performance. These symptoms often appear suddenly and can vary in severity based on the underlying cause. Typical signs include:

• ABS warning light illuminated on the dashboard
• Traction control or stability control warning lights active
• Pulsation or unusual brake pedal feel during braking
• Reduced ABS function (possible wheel lock-up under hard braking)
• Odometer or speedometer may behave erratically

Probable Causes for C1700 #

The most frequent culprits behind C1700 relate to electrical and sensor faults. Understanding the order of likelihood can save valuable diagnostic time. Common causes include:

1. Faulty left rear wheel speed sensor (internal failure or contamination)
2. Damaged or corroded sensor wiring or connectors
3. Broken or loose sensor mounting
4. Open or short circuit in the sensor circuit (wiring harness issues)
5. Malfunctioning ABS control module (less common)

Step-by-Step Diagnostic for C1700 #

Accurate diagnosis is a matter of methodical testing and elimination. Follow this guide to pinpoint the root cause:

• 1. Confirm the code: Use an OBD-II/EOBD scanner to verify the presence of C1700 and check for related ABS codes.
• 2. Visual inspection: Examine the left rear sensor, wiring, and connectors for damage, corrosion, or loose connections.
• 3. Check sensor signal: With a multimeter or oscilloscope, measure sensor voltage and continuity while spinning the wheel.
• 4. Inspect wiring harness: Look for pinched, frayed, or broken wires between the sensor and ABS module.
• 5. Swap test: If possible, swap the left and right rear sensors. If the code moves to the right, the sensor is at fault.
• 6. Test ABS module: If all else checks out, consult OEM procedures to verify ABS control module integrity.

Possible Repairs for C1700 #

Repair actions for C1700 will reflect the diagnosed cause. Always clear the code and retest the system after each repair step:

• Replace a faulty left rear wheel speed sensor
• Repair or replace damaged wiring and corroded connectors
• Secure or replace broken sensor mounting brackets
• Replace the ABS control module (only after confirming all other components are functional)

Is It Safe to Drive With Code C1700? #

It is generally not recommended to drive for extended periods with code C1700 active. While basic braking remains functional, ABS and stability control features may be compromised, increasing the risk of wheel lock-up or loss of traction during sudden stops or slippery conditions. If the ABS warning light is illuminated, exercise extreme caution and seek repairs as soon as possible.

Vehicles Most Commonly Affected by C1700 #

C1700 is a generic code often encountered in vehicles equipped with advanced ABS systems, especially those from Japanese and American manufacturers. The following models are frequently reported with this code:

• Nissan Altima, Murano, Rogue
• Toyota Camry, RAV4, Corolla
• Infiniti G35, FX35
• Mazda 6, CX-5
• Ford Escape, Fusion
• Subaru Outback, Forester

Common Mistakes & Best Practices for C1700 #

Misdiagnosis is a frequent pitfall with ABS sensor codes. Following best practices can prevent wasted time and unnecessary part replacements:

• Assuming the sensor is faulty without checking wiring and connectors first
• Not inspecting for corrosion or damage at the connector pins
• Overlooking the possibility of intermittent wiring faults (wiggle test wires during diagnosis)
• Neglecting to clear the code and retest after repairs
• Always use OEM-spec sensors for best compatibility and performance

Quick FAQ for C1700 #

Having a few key answers at hand makes troubleshooting less daunting:

• Q: Can a DIYer replace a wheel speed sensor?
  
  A: Yes, most sensors are accessible and can be replaced with basic hand tools, but always follow OEM safety precautions and torque specs.
• Q: Will clearing the code fix the problem?
  
  A: No, simply clearing the code does not address the underlying issue. The problem will return unless the root cause is repaired.