OBD Guide
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B2122

Ignition Run Control Circuit Low

B2122 is an OBD-II diagnostic trouble code meaning: Ignition Run Control Circuit Low. Common causes: damaged wiring harness, short circuit in the circuit. Estimated repair cost: $56–167.

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

Symptoms

  • Misfires
  • Difficulty starting the engine
  • Power Loss
  • Check Engine Light Is On

Causes

  • Damaged wiring harness
  • Short circuit in the circuit
  • Faulty ignition module
  • Poor contact in connectors
  • ECU malfunction (rare)

How to Fix

  1. Check the wiring harness for damage and corrosion.
  2. Check connectors and contacts in the ignition control circuit
  3. Check the voltage at the ignition module
  4. If necessary, replace the ignition module
  5. Check and replace ECU if necessary

Related codes

P0351P0352P0353P0354

FAQ

What does the B2122 code mean?

B2122 is an OBD-II diagnostic trouble code that indicates: Ignition Run Control Circuit Low

What causes a B2122 error code?

The most common causes of B2122 include: Damaged wiring harness; Short circuit in the circuit; Faulty ignition module; Poor contact in connectors.

How do I fix a B2122 diagnostic trouble code?

To fix B2122: Check the wiring harness for damage and corrosion.. Check connectors and contacts in the ignition control circuit. Check the voltage at the ignition module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2122?

Limited driving only, diagnose soon

How much does it cost to fix B2122?

The estimated repair cost for B2122 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat