B1340 GMC Code - Left Air Temperature Actuator
|B1340 GMC code possible causes
- Faulty Left Air Temperature Actuator
- Left Air Temperature Actuator harness is open or shorted
- Left Air Temperature Actuator circuit poor electrical connection
- Faulty Instrument Panel Module (IPM)
|How do I fix the B1340 GMC code?Check 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 B1340 GMC code
Labor: 1.0The cost of diagnosing the B1340 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
|What are B1340 GMC code possible symptoms?
- Engine Light ON (or Service Engine Soon Warning Light)
|B1340 GMC code descriptionThe Instrument Panel Module (IPM) controls the HVAC door actuators to regulate the airflow through the Heating, Ventilation, and Air Conditioning (HVAC) system. Each actuator is a 5-wire bi-directional electric motor that incorporates a feedback potentiometer. Ignition 3 voltage, low reference, control, 5-volt reference and position signal circuits enable the actuator to operate. The control circuit uses either a 0, 2.5, or 5-volt signal to command the actuator movement. When the actuator is at rest, the control circuit value is 2.5 volts. A 0 or 5-volt control signal commands the actuator movement in opposite directions. When the actuator shaft rotates, the potentiometer's adjustable contact changes the door position signal between 0-5 volts. The IPM converts the voltage values to count values where one volt is approximately equal to 51 counts. The IPM uses a range of 0-255 counts to index the actuator position. The door position signal voltage is converted to a 0-255 count range. When the module sets a commanded, or targeted value, the control signal is changed to either 0 or 5 volts depending upon the direction that the actuator needs to rotate to reach the commanded value. As the actuator shaft rotates the changing position signal is sent to the module. Once the position signal and the commanded value are the same, the module changes the control signal to 2.5 volts.
|Need more information with the B1340 GMC code?Need more information on how to fix the B1340 GMC code? Get Access to Factory Service Manuals
|Need help with a B1340 GMC code?Get the B1340 Gmc code diagnosed by a professional: Find a repair shop in your area
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