AutoCodes – GMC – B0959 2018 GMC Sierra

B0959 2018 GMC Sierra 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 2018 GMC Sierra 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 230

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 2018 GMC Sierra 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 2018 GMC Sierra - Parking Assist Rear Sensor Left Middle Circuit - AutoCodes.com — B0959 2018 GMC Sierra Code - Parking Assist Rear Sensor Left Middle Circuit

What does this mean?

What are the Possible Causes of the DTC B0959 2018 GMC Sierra?

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 2018 GMC Sierra?

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 2018 GMC Sierra 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 B0959 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code B0959 in a 2018 GMC Sierra related to the Parking Assist Rear Sensor Left Middle Circuit?

- The common symptoms may include issues with the parking assist system, such as malfunctioning or inaccurate readings from the rear sensor on the left side in the middle position.

2. What are the possible causes of OBDII code B0959 in a 2018 GMC Sierra?

- The code B0959 in a 2018 GMC Sierra is typically caused by a fault in the wiring, connectors, or the rear sensor itself in the left middle position of the parking assist system.

3. How can you diagnose the Parking Assist Rear Sensor Left Middle Circuit issue in a 2018 GMC Sierra?

- To diagnose the problem, you can use an OBDII scanner to retrieve the specific trouble code (B0959) and then visually inspect the wiring, connectors, and sensor in the left middle position for any visible damage.

4. What are some repair tips for addressing OBDII code B0959 in a 2018 GMC Sierra?

- Repair tips may include checking and repairing any damaged wiring or connectors associated with the rear sensor in the left middle position, and if necessary, replacing the faulty sensor itself.

5. Can I drive my 2018 GMC Sierra with OBDII code B0959 related to the Parking Assist Rear Sensor Left Middle Circuit?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the parking assist system.

6. How much does it typically cost to repair OBDII code B0959 in a 2018 GMC Sierra?

- The cost of repairing OBDII code B0959 can vary depending on the extent of the damage and whether you choose to do the repairs yourself or take the vehicle to a professional mechanic. Costs may include parts and labor.

7. Are there any recalls or technical service bulletins related to OBDII code B0959 in a 2018 GMC Sierra?

- It's recommended to check with a GMC dealership or visit the NHTSA website to see if there are any recalls or technical service bulletins related to this specific OBDII code for your vehicle.

8. Can extreme weather conditions affect the performance of the Parking Assist Rear Sensor Left Middle Circuit in a 2018 GMC Sierra?

- Extreme weather conditions such as heavy rain, snow, or extreme temperatures can potentially impact the performance of the parking assist system, including the rear sensor in the left middle position.

9. Is it possible to reset the OBDII code B0959 in a 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the trouble code with an OBDII scanner, it is important to address the underlying issue causing the code (such as wiring or sensor problems) to prevent it from reoccurring.

10. How can I prevent OBDII code B0959 related to the Parking Assist Rear Sensor Left Middle Circuit from occurring in my 2018 GMC Sierra?

- Regularly inspecting and maintaining the parking assist system, including the rear sensors and wiring, can help prevent issues like code B0959 from occurring.