AutoCodes – RAM – B128E RAM

B128E RAM 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 RAM 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 3,588

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

What does this mean?

What are the Possible Causes of the DTC B128E RAM?

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 RAM?

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 RAM 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.

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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 B128E RAM Code

What does the OBDII code B128E on a RAM indicate?

The OBDII code B128E indicates a fault with Park Assist Sensor 1 in RAM vehicles. This sensor is part of the system that helps the driver detect obstacles while parking.

What are common symptoms of the B128E code in a RAM?

Common symptoms include the park assist system not functioning, an illuminated check engine light, and possible audible warnings when attempting to use the park assist feature.

What causes the B128E code to be triggered in a RAM?

The B128E code can be triggered by several issues including a faulty park assist sensor, damaged wiring or connectors related to the sensor, or obstructions blocking the sensorâ€™s field of view.

How can I troubleshoot the B128E code in my RAM?

To troubleshoot the B128E code, start by visually inspecting the park assist sensor and its wiring for any visible damage or obstructions. Clean the sensor if it's dirty or obstructed. If no physical issues are detected, further diagnosis with a scan tool and electrical testing might be necessary.

Can I drive my RAM with the B128E code active?

While you can still drive your RAM with the B128E code active, the park assist feature may not function properly. It's advisable to have the issue addressed to ensure full functionality of all safety features.

What repairs can fix the B128E code?

Repairs that can fix the B128E code include replacing the faulty park assist sensor, repairing or replacing damaged wiring or connectors, and removing any obstructions that interfere with the sensorâ€™s operation.

Is it expensive to fix the B128E code in a RAM?

The cost to repair the B128E code can vary. If the issue is due to a faulty sensor, replacement costs depend on the sensor and labor charges. However, if the problem is related to wiring or connectors, the repair might be less expensive unless extensive work is needed.

How important is it to clear the B128E code from a RAM?

Clearing the B128E code is important for maintaining the functionality and effectiveness of the park assist system, which is a key safety feature in your vehicle. Ignoring this code could lead to decreased assistance when parking, increasing the risk of a collision.