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P1E28 Honda Code - Brake Fluid Pressure Sensor PU Circuit Low Voltage

Quick Answer

The P1E28 Honda diagnostic trouble code (DTC) specifically refers to the Brake Fluid Pressure Sensor PU Circuit Low Voltage. Common causes include Malfunctioning brake fluid pressure sensor, Damaged wiring or connectors in the PU circuit, Failed ABS module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1E28 Honda indicates Brake Fluid Pressure Sensor PU Circuit Low Voltage.
Common causes
Common causes include Malfunctioning brake fluid pressure sensor, Damaged wiring or connectors in the PU circuit, Failed ABS module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P1E28 Honda Description

The P1E28 Honda diagnostic trouble code (DTC) specifically refers to the Brake Fluid Pressure Sensor PU Circuit Low Voltage. In vehicles equipped with an anti-lock braking system (ABS), the brake fluid pressure sensor plays a crucial role in monitoring the hydraulic pressure within the brake system. This sensor is responsible for sending data to the vehicle's electronic control unit (ECU) to help regulate the ABS operation and ensure optimal braking performance. When the ECU detects a low voltage signal from the brake fluid pressure sensor in the PU (Pressure Up) circuit, it triggers the P1E28 code.

OBDII Code P1E28 Honda - Brake Fluid Pressure Sensor PU Circuit Low Voltage
P1E28 Honda Code - Brake Fluid Pressure Sensor PU Circuit Low Voltage

Common Causes of P1E28 Honda

  1. Malfunctioning brake fluid pressure sensor
  2. Damaged wiring or connectors in the PU circuit
  3. Failed ABS module
  4. Issues with the ECU
  5. Low brake fluid level or contaminated brake fluid

Symptoms of P1E28 Honda

  1. Illumination of the ABS warning light on the dashboard
  2. Loss of ABS functionality during braking
  3. Increased stopping distance or reduced braking effectiveness
  4. Unusual noises or vibrations during braking
  5. Difficulty maintaining vehicle stability under hard braking

How to Fix P1E28 Honda

  1. Begin by conducting a visual inspection of the brake fluid pressure sensor, wiring, and connectors to check for any obvious signs of damage or corrosion.
  2. Use a multimeter to test the voltage output of the brake fluid pressure sensor in the PU circuit to determine if it is within the specified range.
  3. If the sensor is found to be faulty, replace it with a new OEM (Original Equipment Manufacturer) part to ensure proper functionality.
  4. Inspect and repair any damaged wiring or connectors in the PU circuit to restore proper electrical connections.
  5. Clear the DTC codes from the ECU using a diagnostic scan tool and perform a road test to verify that the ABS system is functioning correctly.

Cost to Fix P1E28 Honda

The typical repair costs for addressing a P1E28 Honda DTC can vary depending on the specific cause of the issue and the labor rates charged by auto repair shops. On average, the cost of replacing a brake fluid pressure sensor can range from $150 to $300, including parts and labor. However, additional costs may be incurred if other components such as the ABS module or ECU need to be replaced. It's advisable to consult with a qualified mechanic or dealership to obtain an accurate estimate based on the specific circumstances of the vehicle in question. Keep in mind that diagnostic time and labor rates can vary based on factors such as location, vehicle make and model, and engine type.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1E28 Honda Code

1. What does the OBDII code P1E28 mean on a Honda?

P1E28 indicates a "Brake Fluid Pressure Sensor PU Circuit Low Voltage," meaning the sensor detecting brake fluid pressure is not receiving or sending proper voltage signals.

2. What are the common symptoms of the P1E28 code in a Honda?

Symptoms may include the brake warning light illuminating, reduced brake performance, ABS malfunction, or the vehicle entering a fail-safe or limp mode.

3. What causes the P1E28 code to appear in a Honda?

The code can be triggered by faulty brake fluid pressure sensors, damaged wiring or connectors, low brake fluid levels, or issues with the vehicle’s Electronic Control Unit (ECU).

4. Can I still drive my Honda with a P1E28 code?

It’s not recommended to drive with this code active, as it may indicate compromised braking performance and affect vehicle safety.

5. How do I diagnose the P1E28 code on a Honda?

Start by inspecting the brake fluid level, checking the sensor’s wiring and connectors for damage, and using a multimeter to test the voltage at the sensor.

6. How do I fix the P1E28 code in my Honda?

Repairs may include replacing the brake fluid pressure sensor, repairing or replacing damaged wiring, refilling brake fluid, or recalibrating the ECU.

7. Can low brake fluid cause the P1E28 code?

Yes, low brake fluid levels can cause the sensor to read incorrect pressures, potentially triggering the P1E28 code.

8. How much does it cost to fix the P1E28 code on a Honda?

Repair costs vary, but replacing a brake fluid pressure sensor typically costs $150–$300, depending on parts and labor rates.

9. Can a dead or weak battery cause the P1E28 code?

Yes, a weak or dying battery can result in low voltage to the sensor, potentially triggering this code.

10. Do I need to reset the ECU after fixing the P1E28 code?

Yes, after repairs, it’s necessary to clear the code using an OBDII scanner and test drive the vehicle to ensure the issue is resolved.

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