Engine-Codes - GMC - B1380 GMC

B1380 GMC Code - Device Ignition Accessory Circuit

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- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B1380 GMC?

  • Faulty Ignition Switch
  • Ignition Switch harness is open or shorted
  • Ignition Switch circuit poor electrical connection
  • Faulty Body Control Module (BCM)

|How to Fix the B1380 GMC Code?

Start by checking 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.

|Code B1380 GMC Tech Notes

B1380 01 Device Ignition ACCESSORY Circuit Short to Battery
B1380 06 Device Ignition ACCESSORY Circuit Short to Ground or Open

|What is the Cost to Diagnose the Code B1380 GMC?

Labor: 1.0

The cost to diagnose the B1380 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.

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|When is the B1380 GMC Code Detected?

When the BCM detects a short to ground in the circuit or a short to battery or an open in the circuit when the switch is in the OFF position.

|What are Code B1380 GMC Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B1380 GMC Code Mean?

The vehicle Power Mode Master (PMM) is the Body Control Module (BCM). The ignition switch is a low current switch with multiple discrete ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this information to identify the operator's desired power mode and activate specific discrete signals, and serial data messages for the operation of different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data message does not match what the individual module can detect from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Some relays controlled by the BCM are switched ignition voltage outputs that are pass through circuits within the BCM directly from the ignition switch. If these circuits short to ground, the B+ circuit fuse to the ignition switch will open.

B1380 GMC Code - Device Ignition Accessory Circuit

|Need more Information on the B1380 GMC Code?

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