AutoCodes – Generic – B128E

B128E Code - Park Assist Sensor 1

Quick Answer

The Park Assist Sensors (PTS) are ultrasonic transceivers that are completely controlled by the Park Assist Module. Common causes include Faulty Park Assist Sensor 1, Park Assist Sensor 1 harness is open or shorted, Park Assist Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B128E indicates Park Assist Sensor 1.
Common causes: Common causes include Faulty Park Assist Sensor 1, Park Assist Sensor 1 harness is open or shorted, Park Assist Sensor 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 5,239

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 29, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B128E Description

The Park Assist Sensors (PTS) are ultrasonic transceivers that are completely controlled by the Park Assist Module. The sensors transmit and receive ultrasonic signals. Each sensor has a voltage, signal, and return the circuit to the module. The sensors communicate with the Park Assist Module using a dedicated serial bus communication circuit. The Park Assist Module monitors the PTS Sensor when the vehicle in reverse and during the self-test while the vehicle is in drive between 18 km/h (11 mph) and 40 km/h (25 mph). The Park Assist Module sets the OBDII code when the Park Assist Sensor Signal circuit is not to factory specifications.

OBDII Code B128E - Park Assist Sensor 1 - AutoCodes.com — B128E Code - Park Assist Sensor 1

What does this mean?

What are the Possible Causes of the DTC B128E?

Faulty Park Assist Sensor 1
Park Assist Sensor 1 harness is open or shorted
Park Assist Sensor 1 circuit poor electrical connection
Faulty Park Assist Module

How to Fix the DTC B128E?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B128E-11 PTS SENSOR 1 CIRCUIT SHORT TO GROUND
B128E-12 PTS SENSOR 1 CIRCUIT SHORT TO BATTERY
B128E-25 PTS SENSOR 1 SIGNAL SHAPE / WAVEFORM FAILURE
B128E-92 PTS SENSOR 1 PERFORMANCE OR INCORRECT OPERATION

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B128E code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B128E code?

Need more information on how to fix the B128E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B128E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B128E Chrysler — Park Assist Sensor 1
B128E Dodge — Park Assist Sensor 1
B128E Jeep — Park Assist Sensor 1
B128E RAM — Park Assist Sensor 1

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 B128E Code

1. What does OBDII code B128E "Park Assist Sensor 1" indicate?

- This code indicates a malfunction in the Park Assist Sensor 1, which is part of the vehicle's parking assistance system.

2. What are the common symptoms of OBDII code B128E?

- Common symptoms include erratic or inaccurate readings from the Park Assist Sensor 1, and the parking assistance system may not work properly.

3. What can cause OBDII code B128E to trigger?

- The code can be triggered by a faulty Park Assist Sensor 1, damaged wiring or connectors related to the sensor, or problems with the parking assistance system.

4. How can I diagnose the issue related to OBDII code B128E?

- Diagnosis involves inspecting the Park Assist Sensor 1 for physical damage, checking the wiring and connectors for any issues, and using a diagnostic scanner to retrieve more information about the fault.

5. Can I still drive my vehicle with OBDII code B128E present?

- It is generally safe to drive the vehicle with this code, but you may experience issues with the parking assistance system. It is recommended to address the problem promptly.

6. How do I repair OBDII code B128E?

- Repair may involve replacing the faulty Park Assist Sensor 1, repairing damaged wiring or connectors, or recalibrating the parking assistance system with the help of a professional.

7. Can I reset OBDII code B128E without repairing the issue?

- While you can clear the code with a diagnostic scanner, it is important to address the underlying problem to ensure the proper functioning of the parking assistance system.

8. Are there any DIY tips for troubleshooting OBDII code B128E?

- You can visually inspect the Park Assist Sensor 1 for physical damage, check the wiring for any visible issues, and ensure that the sensor is securely connected.

9. Is it common for the Park Assist Sensor 1 to fail and trigger OBDII code B128E?

- Sensor failures can occur due to various reasons, such as environmental factors, vehicle age, or electrical issues. Regular maintenance can help prevent such failures.

10. How long does it typically take to repair OBDII code B128E?

- The repair time can vary depending on the exact cause of the issue. Simple fixes like replacing a sensor or repairing wiring may take a few hours, while more complex issues could require more time and professional expertise.