OBD Guide
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B2123

Ignition Run Control Circuit High

B2123 is an OBD-II diagnostic trouble code meaning: Ignition Run Control Circuit High. Common causes: wiring harness fault, problems with ignition sensors. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Rough engine operation
  • Power dips
  • Increased fuel consumption
  • Difficulty starting the engine

Causes

  • Wiring harness fault
  • Problems with ignition sensors
  • ECU malfunction
  • Short circuit in the circuit

How to Fix

  1. Check the integrity of the wiring harness
  2. Check ignition sensors
  3. Check the operation of the computer
  4. Eliminate possible short circuits

Related codes

P0300P0301P0302

FAQ

What does the B2123 code mean?

B2123 is an OBD-II diagnostic trouble code that indicates: Ignition Run Control Circuit High

What causes a B2123 error code?

The most common causes of B2123 include: Wiring harness fault; Problems with ignition sensors; ECU malfunction; Short circuit in the circuit.

How do I fix a B2123 diagnostic trouble code?

To fix B2123: Check the integrity of the wiring harness. Check ignition sensors. Check the operation of the computer. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2123?

Limited driving only, diagnose soon

How much does it cost to fix B2123?

The estimated repair cost for B2123 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat