Engine-Codes - Generic - B2123

B2123 Code - Ignition Run Control Circuit High

- Code Popularity: 6,047 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

What are the Possible Causes of the Code B2123?

  • Faulty Run Relay
  • Run Relay harness is open or shorted
  • Run Relay circuit poor electrical connection
  • Faulty Front Control Module (FCM)

How to Fix the B2123 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.

What is the Cost to Diagnose the Code B2123?

Labor: 1.0

The cost to diagnose the B2123 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 B2123 Possible Symptoms?

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

What Does the B2123 Code Mean?

The Front Control Module monitors the Ignition Run Control Circuit. The Front Control Module will set this Diagnostic Trouble Code (DTC) within 500ms if the Run Relay Control Circuit voltage is shorted to voltage.

B2123 Code - Ignition Run Control Circuit High

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Code B2123 Information for Specific Makes

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