AutoCodes – GMC – B1318 GMC

B1318 GMC Code - Left Sunload Sensor

Quick Answer

The Instrument Panel Module (IPM) monitors ambient light with the left and right sunload sensors. Common causes include Faulty Left Sunload Sensor, Left Sunload Sensor harness is open or shorted, Left Sunload Sensor 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: B1318 GMC indicates Left Sunload Sensor.
Common causes: Common causes include Faulty Left Sunload Sensor, Left Sunload Sensor harness is open or shorted, Left Sunload Sensor 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 1,178

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 Nov 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1318 GMC Description

The Instrument Panel Module (IPM) monitors ambient light with the left and right sunload sensors. The sunload sensors are an infrared light sensitive photodiode. The IPM supplies 5 volts to the sunload sensors signal circuit and provides a low reference circuit. As the light shining upon the sensor gets brighter, the sensor conductance increases. The sensor signal decreases as the conductance increases. The IPM uses this information to compensate for the effect of the sun on the inside air temperature of the vehicle. The IPM converts the voltage values to count values where one volt is approximately equal to 51 counts.

OBDII Code B1318 GMC - Left Sunload Sensor - AutoCodes.com — B1318 GMC Code - Left Sunload Sensor

What does this mean?

What are the Possible Causes of the DTC B1318 GMC?

Faulty Left Sunload Sensor
Left Sunload Sensor harness is open or shorted
Left Sunload Sensor circuit poor electrical connection
Faulty Instrument Panel Module (IPM)

How to Fix the DTC B1318 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1318 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.

Need more information about the B1318 GMC code?

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Need Help with the Code?

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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 B1318 GMC Code

1. What are the common symptoms of OBDII code B1318 GMC (Left Sunload Sensor)?

- Common symptoms include inaccurate temperature readings inside the vehicle, inconsistent climate control performance, and the air conditioning system not cooling effectively.

2. What can cause the OBDII code B1318 GMC (Left Sunload Sensor) to trigger?

- The code B1318 can be triggered by a faulty left sunload sensor, damaged wiring or connectors, or issues with the climate control module.

3. How can I diagnose the OBDII code B1318 GMC (Left Sunload Sensor) at home?

- You can diagnose the code by visually inspecting the left sunload sensor for any visible damage, checking the wiring and connectors for signs of wear or corrosion, and using a multimeter to test the sensor's resistance.

4. Can I still drive my vehicle with the OBDII code B1318 GMC (Left Sunload Sensor) present?

- It is generally safe to drive your vehicle with this code, but you may experience issues with the climate control system's performance until the problem is resolved.

5. What is the typical repair process for fixing the OBDII code B1318 GMC (Left Sunload Sensor)?

- The typical repair process involves replacing the faulty left sunload sensor, repairing or replacing any damaged wiring or connectors, and clearing the code with an OBDII scanner.

6. Are there any DIY tips for resolving the OBDII code B1318 GMC (Left Sunload Sensor)?

- You can attempt to clean the sensor and its surrounding area to ensure proper operation, but if the issue persists, it's best to consult a professional for a more comprehensive diagnosis and repair.

7. How much does it cost to fix the OBDII code B1318 GMC (Left Sunload Sensor) at a repair shop?

- The cost of fixing this code can vary depending on the extent of the issue, but it typically ranges from $100 to $300, including parts and labor.

8. How long does it take to repair the OBDII code B1318 GMC (Left Sunload Sensor)?

- The repair process can usually be completed within an hour or two, but it may take longer if additional troubleshooting or repairs are needed.

9. Can extreme temperatures or sunlight exposure affect the left sunload sensor and trigger the OBDII code B1318 GMC?

- Yes, extreme temperatures or prolonged sunlight exposure can potentially damage the left sunload sensor and lead to the triggering of the B1318 code.

10. Is the OBDII code B1318 GMC (Left Sunload Sensor) a common issue in GMC vehicles?

- While not extremely common, issues with sunload sensors triggering the B1318 code can occur in various GMC models, especially in older vehicles or those exposed to harsh environmental conditions.