A faulty brake pressure sensor N that has failed internally and is outputting a lower-than-expected voltage.; Damaged or corroded wiring between the sensor and the ABS control module, such as a chafed wire, a broken connector pin, or corrosion at the sensor plug.; A poor electrical connection at the sensor or module connector, often caused by water intrusion or loose terminals.; Low brake fluid level or air in the hydraulic system, which can cause the sensor to read pressure outside the expected range.; A failing ABS control module that misinterprets a valid sensor signal or has an internal circuit fault on the sensor input channel.; A short to ground on the sensor signal wire, which pulls the voltage below the normal operating range.; A defective brake pressure sensor ground circuit, which can bias the sensor output low.

DTC codes / C06xx · Brakes, steering and suspension / C064F

C064FBrake Pressure Sensor N Circuit Low

Q: What does code C064F mean?

Brake Pressure Sensor N Circuit Low. C064F means the antilock brake system (ABS) control module has detected a low-voltage condition on the electrical circuit for brake pressure sensor N, which is one of several pressure sensors used to monitor hydraulic brake pressure. The module expects a signal voltage within a specific range, and the voltage it is seeing is below the minimum threshold, so it sets this code and typically disables ABS and stability control.

C064F means the antilock brake system (ABS) control module has detected a low-voltage condition on the electrical circuit for brake pressure sensor N, which is one of several pressure sensors used to monitor hydraulic brake pressure. The module expects a signal voltage within a specific range, and the voltage it is seeing is below the minimum threshold, so it sets this code and typically disables ABS and stability control.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

The ABS warning light and often the traction control or stability control light illuminate on the dashboard.
The brake pedal may feel firmer or require more effort than usual because the ABS module cannot accurately read hydraulic pressure.
ABS and stability control are disabled, so the wheels can lock under hard braking and the vehicle may skid more easily.
A generic scan tool may show no other codes, and the vehicle often drives normally otherwise.
In some vehicles, the electronic parking brake or hill-start assist may also be disabled as a safety precaution.
Often no symptoms besides the warning light, especially if the sensor fault is intermittent or only affects a secondary pressure circuit.

Common causes, most likely first

A faulty brake pressure sensor N that has failed internally and is outputting a lower-than-expected voltage.
Damaged or corroded wiring between the sensor and the ABS control module, such as a chafed wire, a broken connector pin, or corrosion at the sensor plug.
A poor electrical connection at the sensor or module connector, often caused by water intrusion or loose terminals.
Low brake fluid level or air in the hydraulic system, which can cause the sensor to read pressure outside the expected range.
A failing ABS control module that misinterprets a valid sensor signal or has an internal circuit fault on the sensor input channel.
A short to ground on the sensor signal wire, which pulls the voltage below the normal operating range.
A defective brake pressure sensor ground circuit, which can bias the sensor output low.

How to diagnose and fix it

Check the brake fluid level and inspect for leaks; top up or repair the hydraulic system if the level is low.
Inspect the brake pressure sensor N and its connector for corrosion, damage, or loose pins, and clean or repair as needed.
Disconnect the sensor and measure the reference voltage and ground at the connector with the key on; compare to the manufacturer's specification.
Measure the resistance of the sensor signal wire from the sensor connector to the ABS module connector to check for opens or high resistance.
Check for a short to ground on the sensor signal wire using a multimeter, and repair any chafed or pinched wiring.
If the wiring and connectors are good, test the sensor itself by back-probing the signal wire and comparing the voltage to the specified range while applying brake pressure.
If the sensor tests bad, replace it and clear the code; if the sensor tests good but the code persists, diagnose the ABS control module or have it rebuilt/replaced.

What a low brake pressure sensor signal really means

A low brake fluid level is one of the most common causes of this code that people overlook, because the sensor reads pressure that is lower than expected when the system is not fully charged.
The code can be set by a momentary voltage drop during engine cranking, so a weak battery or poor ground connection can trigger it even when the sensor is fine.
Some vehicles use the brake pressure sensor for hill-start assist and adaptive cruise control, so a fault can disable those features even if the brakes feel normal.
A scan tool that only reads generic OBD-II codes may not show this code; you often need an ABS-capable scan tool to see it and to view live pressure sensor data.
Replacing the sensor without checking the wiring and fluid level is a common misdiagnosis, and the new sensor will set the same code if the real problem is a chafed wire or low fluid.

Can I keep driving with C064F?

You can usually drive the vehicle to a repair shop, but avoid hard braking and any situation where you need ABS or stability control, because those systems are disabled. If the brake pedal feels abnormal or the fluid level is low, stop driving and have the vehicle towed to prevent a brake failure.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.