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DTC codes / C06xx · Brakes, steering and suspension / C064E

C064EBrake Pressure Sensor N Circuit High

C064E means the antilock braking system (ABS) control module has detected an abnormally high voltage on the signal circuit for brake pressure sensor N, one of several pressure sensors used to monitor hydraulic brake pressure. The module expects the sensor's output to stay within a defined voltage window, and a reading above that window sets this code.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • The ABS warning light is illuminated on the dashboard, often accompanied by the traction control and stability control lights.
  • The brake pedal may feel firmer or less responsive than normal because the ABS module cannot accurately judge hydraulic pressure.
  • ABS and stability control functions are disabled, so the system will not intervene during hard braking or loss of traction.
  • A generic scan tool may show the code as current or history, and some vehicles display a 'Service Brake System' message.
  • Often no symptoms besides the warning light, especially if the fault is intermittent or only affects a secondary pressure sensor.
  • In some cases, the cruise control or hill-start assist may be inhibited because those systems rely on brake pressure data.

Common causes, most likely first

  1. A faulty brake pressure sensor N that is internally shorted to a higher voltage reference.
  2. A short to voltage on the sensor's signal wire, often caused by chafed insulation against a nearby power wire.
  3. Corroded or loose terminals at the sensor connector or at the ABS control module connector.
  4. A defective ABS control module with an internal fault in the sensor input circuit.
  5. A poor ground connection for the sensor or the ABS module, which can skew the reference voltage.
  6. Aftermarket accessories or wiring repairs that have tapped into the sensor circuit and introduced a voltage offset.

How to diagnose and fix it

  1. Connect a scan tool and record all ABS codes and live data for brake pressure sensor N to confirm the high voltage reading.
  2. Visually inspect the sensor connector and the wiring harness for damage, corrosion, or loose pins, and repair as needed.
  3. Measure the sensor's reference voltage and signal voltage with a digital multimeter (DMM) at the connector, comparing to the manufacturer's specification.
  4. Disconnect the ABS module and check the signal wire for a short to voltage using a DMM, repairing any chafed or shorted wiring.
  5. Perform a resistance and voltage-drop test on the sensor's ground circuit to rule out a bad ground.
  6. If the wiring and grounds are good, substitute a known-good sensor or perform a sensor sweep test to verify the sensor's output.
  7. If the sensor and wiring check out, diagnose or replace the ABS control module as the last step.

Why brake pressure sensor N codes mislead

  • A high voltage reading on a pressure sensor circuit is often caused by a short to voltage in the harness rather than a failed sensor, so technicians who replace the sensor first frequently see the code return.
  • The ABS module may set this code intermittently if the sensor signal spikes during hard braking or when the vehicle hits a bump, which can make it hard to reproduce in the shop.
  • Some vehicles use a shared reference voltage for multiple pressure sensors, so a fault in one sensor's wiring can affect the readings of others and set related codes.
  • A weak battery or charging system that produces voltage spikes can cause the ABS module to log a high voltage code even when the sensor circuit itself is healthy.
  • After a collision repair or suspension work, a pinched or stretched sensor harness is a common cause that is easily overlooked during a visual inspection.

Can I keep driving with C064E?

You can usually drive the vehicle with this code because the base brakes remain functional, but ABS and stability control are disabled, so avoid hard braking, slippery surfaces, and towing until the fault is repaired. If the brake pedal feels abnormal or the warning light is accompanied by a red brake warning, stop driving and have the system inspected immediately.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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