Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer isn't getting a signal from the sensor that tells it how fast the right front wheel is spinning.
The P1777 code indicates that the Controller Area Network (CAN) is not receiving a signal from the front right wheel speed sensor.
The wheel speed sensor is a critical component of the vehicle's anti-lock braking system (ABS) and traction control system. It sends data about the wheel's speed to the vehicle's control modules via the CAN bus. If the control module detects no signal from the sensor, it triggers the P1777 code.
• ABS warning light on
• Traction control warning light on
• Inoperative ABS or traction control
• Faulty wheel speed sensor
• Damaged wiring or connectors
• Faulty ABS control module
CAN: Controller Area Network, a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.
ABS: Anti-lock Braking System, a safety anti-skid braking system used on aircraft and on land vehicles.
• Inspect the wheel speed sensor and wiring for damage.
• Check the sensor's electrical connection.
• Use a multimeter to test the sensor's output signal.
• Replace the faulty wheel speed sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• OBD-II scanner
• Multimeter
• Socket set
$150 - $400
Moderate
• Nissan Altima
• Infiniti G35
• Nissan Maxima
• Regularly inspect wheel speed sensors.
• Ensure connectors are free from corrosion.
• Avoid harsh driving conditions that may damage sensors.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the vehicle inspected by a professional if you notice any warning lights.
Check with the vehicle manufacturer for warranty coverage on sensors.
This code has been reported in vehicles with high mileage or after exposure to harsh driving conditions.
Moderate – While the vehicle is still drivable, the ABS and traction control systems may not function correctly.
Driving without a functioning ABS may increase stopping distances and affect vehicle stability.
• Vehicle must be in motion.
• Diagnostic tool connected to the OBD-II port.
The wheel speed sensor is located near the wheel hub assembly of the front right wheel.
Q: Can I drive with a P1777 code?
A: While you can drive, it's not recommended as the ABS and traction control systems may not work properly.
Q: How do I clear a P1777 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.