B1318 GMC Possible Causes
- 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 do I fix code B1318 GMCCheck the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Cost of diagnosing the B1318 GMC code
Labor: 1.0The cost of diagnosing the B1318 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
- Engine Light ON (or Service Engine Soon Warning Light)
B1318 Gmc DescriptionThe 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.
B1318 GMC More InformationNeed more information on how to fix the B1318 GMC code?
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