Engine-Codes - Generic - B1390

B1390 Code - Control Module Supply Circuit 1

- Code Popularity: 11,707 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B1390?

  • Low battery voltage
  • Faulty Control Module
  • Control Module harness is open or shorted
  • Control Module circuit poor electrical connection

|How to Fix the B1390 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 B1390 Tech Notes

B1390:83 Ambient Light Control Module: Value of Signal Protection Calculation Incorrect
B1390:87 Ambient Light Control Module: Missing Message

|What is the Cost to Diagnose the Code B1390?

Labor: 1.0

The cost to diagnose the B1390 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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|What are Code B1390 Possible Symptoms?

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

|What Does the B1390 Code Mean?

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Damage to components, and incorrect data can occur when the voltage is out of range. The vehicle has multiple Control Modules that will set this Diagnostic Trouble Code (DTC).

Control Module Supply Circuit 1

|Need more Information on the B1390 Code?

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|Code B1390 Information for Specific Makes

|Need Help with the B1390 Code?

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