C0044: Brake Pressure Sensor "A" (Subfault)

What it means

This code identifies a fault associated with brake pressure sensor A. The specific failure depends on the diagnostic subtype.

How it works

Brake pressure sensor A reports hydraulic pressure to the brake-control system, which uses it when managing anti-lock braking and stability functions. This subfault code points to sensor A or its circuit, but the base code does not specify the electrical or signal failure.

Common causes

Most likely first.

1. Faulty brake pressure sensor
2. Damaged wiring or connector
3. Corrosion at connector
4. Poor sensor power or ground
5. Brake control module fault

Symptoms

• ABS or brake warning light
• Stability control warning
• Reduced stability control
• Unusual braking feel

How to diagnose it

1. Scan the brake-control module and review freeze-frame data, then compare live pressure sensor A data with pedal application and other available brake readings.
2. Inspect sensor A's connector and nearby harness for corrosion, fluid contamination, loose pins, or wire damage.
3. Check the sensor mounting and the surrounding hydraulic area for leakage or physical damage without loosening any brake line.
4. Test sensor A power, ground, and signal circuit against the vehicle wiring diagram and manufacturer's procedure.
5. If the circuit checks out, compare sensor A's reading with the manufacturer's test method to determine whether the sensor or module input is faulty.

Common fixes

• Clean and secure sensor A's electrical connector if contamination or looseness is found.
• Repair damaged sensor A wiring or restore its power or ground.
• Replace brake pressure sensor A if its output fails testing.
• Repair the brake-control module only if its sensor A input is confirmed defective.

Can I keep driving?

ABS and stability control may be reduced, and braking feel may change if pressure data is unreliable. If the brake pedal feels abnormal or a brake warning is on, stop safely and have the vehicle checked before driving further.