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Engine-Codes – GMC – B0958 2018 GMC Sierra

B0958 2018 GMC Sierra Code - Parking Assist Rear Sensor Left Corner Circuit

Quick Answer

The B0958 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Parking Assist Rear Sensor Left Corner Circuit. Common causes include Damaged wiring or connectors leading to the rear left corner sensor, Loose or corroded connections in the sensor circuit, Faulty rear left corner sensor. 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
B0958 2018 GMC Sierra indicates Parking Assist Rear Sensor Left Corner Circuit.
Common causes
Common causes include Damaged wiring or connectors leading to the rear left corner sensor, Loose or corroded connections in the sensor circuit, Faulty rear left corner sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 16, 2024
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Code B0958 2018 GMC Sierra Description

The B0958 diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to an issue with the Parking Assist Rear Sensor Left Corner Circuit. This code indicates that there is a malfunction in the circuitry of the rear left corner sensor used for the vehicle's parking assist system. The parking assist system uses sensors located around the vehicle to detect obstacles and provide the driver with alerts to assist in parking maneuvers.

OBDII Code B0958 2018 GMC Sierra - Parking Assist Rear Sensor Left Corner Circuit
B0958 2018 GMC Sierra Code - Parking Assist Rear Sensor Left Corner Circuit

Common Causes of B0958 2018 GMC Sierra

  1. Damaged wiring or connectors leading to the rear left corner sensor.
  2. Loose or corroded connections in the sensor circuit.
  3. Faulty rear left corner sensor.
  4. Water or debris intrusion affecting sensor performance.
  5. Electrical issues within the parking assist system.

Symptoms of B0958 2018 GMC Sierra

  1. Parking assist system not providing alerts for obstacles on the rear left corner of the vehicle.
  2. Inaccurate or inconsistent alerts from the parking assist system.
  3. Parking assist system error message or warning light on the dashboard.
  4. Difficulty parking or maneuvering the vehicle in tight spaces due to lack of sensor functionality.

How to Fix B0958 2018 GMC Sierra

  1. Begin by visually inspecting the wiring and connectors leading to the rear left corner sensor for any signs of damage or corrosion.
  2. Test the sensor and its connections using a multimeter to check for continuity and proper voltage.
  3. Replace the rear left corner sensor if it is found to be faulty or damaged.
  4. Clear the DTC from the vehicle's computer using a diagnostic scan tool.
  5. Test the parking assist system to ensure proper functionality after the repair.

Cost to Fix B0958 2018 GMC Sierra

The cost of repairing a Parking Assist Rear Sensor Left Corner Circuit issue can vary depending on the specific cause of the problem and the cost of parts and labor. In general, the cost of replacing a sensor and addressing wiring issues can range from $200 to $500. However, additional diagnostic time and labor costs may apply, with total repair costs potentially exceeding $500. It's recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.

What does this mean?

Tech Notes for B0958 2018 GMC Sierra

B0958:01 Parking Assist Rear Sensor Left Corner Circuit Short to Battery

B0958:02 Parking Assist Rear Sensor Left Corner Circuit Short to Ground

B0958:04 Parking Assist Rear Sensor Left Corner Circuit Open

B0958:06 Parking Assist Rear Sensor Left Corner Circuit Low Voltage/Open

B0958:08 Parking Assist Rear Sensor Left Corner Circuit Performance - Signal Invalid

B0958:18 Parking Assist Rear Sensor Left Corner Circuit Low Signal Amplitude

B0958:21 Parking Assist Rear Sensor Left Corner Circuit Incorrect Period

B0958:22 Parking Assist Rear Sensor Left Corner Circuit Too Short Low-Time

B0958:3A Parking Assist Rear Sensor Left Corner Circuit Incorrect Component Installed

B0958:3B Parking Assist Rear Sensor Left Corner Circuit Self-Test Malfunction

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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 B0958 2018 GMC Sierra Code

1. What does the OBDII code B0958 mean on a 2018 GMC Sierra?

The B0958 code indicates an issue with the Parking Assist Rear Sensor Left Corner Circuit, typically involving a malfunction in the sensor or its wiring.

2. What are common symptoms of the B0958 code on a GMC Sierra?

Common symptoms include the rear parking assist system not working, warning messages on the dashboard, and intermittent or no sensor feedback.

3. What causes the B0958 code on a 2018 GMC Sierra?

The code can be caused by a faulty left corner parking assist sensor, damaged wiring, corroded connections, or a failure in the parking assist control module.

4. How do I diagnose the B0958 code on my GMC Sierra?

Start by visually inspecting the left corner parking sensor and its wiring for damage or corrosion. Use a scan tool to confirm the code and check for related codes or data.

5. Can I drive my 2018 GMC Sierra with the B0958 code active?

Yes, you can drive the truck, but the rear parking assist system may not function properly, increasing the risk of reverse collisions.

6. How do I fix the B0958 code on a GMC Sierra?

Repairs may involve replacing the faulty left corner sensor, repairing damaged wiring, cleaning corroded connectors, or reprogramming the parking assist module.

7. How much does it cost to repair the B0958 code on a GMC Sierra?

Repair costs vary but typically range from $50 to $250, depending on whether the sensor, wiring, or module needs to be repaired or replaced.

8. How can I prevent the B0958 code from recurring?

Regularly clean the parking sensors to prevent dirt buildup, inspect the wiring for wear, and address any moisture-related issues around the connectors.

9. Do I need special tools to fix the B0958 code?

A basic multimeter and an OBDII scan tool are helpful for diagnosis, while some repairs may require specialized tools to replace the sensor.

10. Can a faulty parking assist control module cause the B0958 code?

Yes, though less common, a malfunctioning parking assist control module can cause the code if it fails to communicate with the left corner sensor properly.

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