AutoCodes – GMC – B0959 GMC

B0959 GMC Code - Parking Assist Rear Sensor Left Middle Circuit

Quick Answer

The parking assist sensors are 3-wire ultrasonic sensors that are used to determine the distance between the vehicle and an object. Common causes include Faulty Parking Assist Rear Sensor Left Middle, Parking Assist Rear Sensor Left Middle harness is open or shorted, Parking Assist Rear Sensor Left Middle circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0959 GMC indicates Parking Assist Rear Sensor Left Middle Circuit.
Common causes: Common causes include Faulty Parking Assist Rear Sensor Left Middle, Parking Assist Rear Sensor Left Middle harness is open or shorted, Parking Assist Rear Sensor Left Middle circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 5,555

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 02, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0959 GMC Description

The parking assist sensors are 3-wire ultrasonic sensors that are used to determine the distance between the vehicle and an object. The Parking Assist Control Module supplies 12 V to the parking assist sensors via the 12 V reference circuit and provides ground via the low reference circuit. The Parking Assist Control Module triggers the sensors in a sequential loop. After each sensor transmits, the Parking Assist Control Module uses the sensor echo received through the signal circuit to calculate the distance and position of an object. The Diagnostic Trouble Code (DTC) will be set when the Parking Aid Rear Sensor signal to the Parking Assist Control Module is out of specification.

OBDII Code B0959 GMC - Parking Assist Rear Sensor Left Middle Circuit - AutoCodes.com — B0959 GMC Code - Parking Assist Rear Sensor Left Middle Circuit

What does this mean?

What are the Possible Causes of the DTC B0959 GMC?

Faulty Parking Assist Rear Sensor Left Middle
Parking Assist Rear Sensor Left Middle harness is open or shorted
Parking Assist Rear Sensor Left Middle circuit poor electrical connection
Faulty Parking Assist Control Module

How to Fix the DTC B0959 GMC?

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

B0959:01 Parking Assist Rear Sensor Left Middle Circuit Short to Battery
B0959:02 Parking Assist Rear Sensor Left Middle Circuit Short to Ground
B0959:04 Parking Assist Rear Sensor Left Middle Circuit Open
B0959:06 Parking Assist Rear Sensor Left Middle Circuit Low Voltage/Open
B0959:08 Parking Assist Rear Sensor Left Middle Circuit Performance - Signal Invalid
B0959:18 Parking Assist Rear Sensor Left Middle Circuit Low Signal Amplitude
B0959:21 Parking Assist Rear Sensor Left Middle Circuit Incorrect Period
B0959:22 Parking Assist Rear Sensor Left Middle Circuit Too Short Low-Time
B0959:3A Parking Assist Rear Sensor Left Middle Circuit Incorrect Component Installed
B0959:3B Parking Assist Rear Sensor Left Middle Circuit Self-Test Malfunction

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0959 GMC 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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Information for Specific GMC Models

B0959 2014 GMC Sierra — Parking Assist Rear Sensor Left Middle Circuit
B0959 2015 GMC Sierra — Parking Assist Rear Sensor Left Middle Circuit
B0959 2016 GMC Sierra — Parking Assist Rear Sensor Left Middle Circuit
B0959 2017 GMC Sierra — Parking Assist Rear Sensor Left Middle Circuit
B0959 2018 GMC Sierra — Parking Assist Rear Sensor Left Middle Circuit

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 B0959 GMC Code

1. What are the common symptoms of OBDII code B0959 GMC (Parking Assist Rear Sensor Left Middle Circuit)?

- Common symptoms include a malfunctioning or non-responsive rear parking sensor on the left middle side of the vehicle, leading to inaccurate or no distance alerts when parking.

2. What are the possible causes of OBDII code B0959 GMC?

- The code B0959 GMC can be triggered by issues such as a faulty rear parking sensor, damaged wiring or connectors related to the sensor, or a problem with the sensor control module.

3. How can I diagnose the cause of OBDII code B0959 GMC?

- Diagnosing the issue involves inspecting the rear parking sensor on the left middle side of the vehicle for physical damage, checking the wiring and connectors for any signs of wear or corrosion, and using a diagnostic scan tool to communicate with the sensor control module.

4. What are some tips for repairing OBDII code B0959 GMC?

- Repair tips may include replacing the faulty rear parking sensor, repairing or replacing damaged wiring and connectors, and resetting or reprogramming the sensor control module as needed.

5. Can I drive my vehicle with OBDII code B0959 GMC?

- While it may be possible to drive the vehicle with this code, it is recommended to address the issue promptly to ensure the proper functioning of the parking assist system for your safety and convenience.

6. How do I reset the OBDII code B0959 GMC after making repairs?

- After making the necessary repairs, you can reset the OBDII code B0959 GMC using a diagnostic scan tool capable of clearing trouble codes. This will help clear the error code and turn off the Check Engine light.

7. Are there any precautions to take when working on the parking assist system related to OBDII code B0959 GMC?

- It is important to disconnect the vehicle's battery before working on the parking assist system to prevent any electrical damage or short circuits. Additionally, following manufacturer guidelines and using proper tools is recommended.

8. What is the typical cost to repair OBDII code B0959 GMC at a repair shop?

- The cost to repair OBDII code B0959 GMC can vary depending on the specific issue, parts required, labor rates, and location. It is advisable to consult with a trusted mechanic or dealership for an accurate estimate.

9. Can weather conditions affect the triggering of OBDII code B0959 GMC?

- Extreme weather conditions like heavy rain, snow, or extreme temperatures can potentially affect the performance of the rear parking sensor, leading to the triggering of OBDII code B0959 GMC. Regular maintenance and inspection can help prevent such issues.

10. Is it possible to bypass or disable the parking assist system to avoid OBDII code B0959 GMC?

- While it may be possible to bypass or disable the parking assist system temporarily, it is not recommended as it compromises the safety features of the vehicle. It is best to address the underlying issue causing the code.