OBD Guide
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B212D

Ignition Run Only Input Circuit Open

B212D is an OBD-II diagnostic trouble code meaning: Ignition Run Only Input Circuit Open. Common causes: break in the wiring harness, contact corrosion. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Problems starting the engine
  • Unstable engine operation
  • Security warning on dashboard

Causes

  • Break in the wiring harness
  • Contact corrosion
  • Ignition module malfunction
  • Immobilizer problems
  • Ignition relay malfunction

How to Fix

  1. Check the wiring harness for breaks or damage
  2. Inspect contacts for corrosion and clean if necessary.
  3. Check the voltage in the ignition circuit
  4. Test the ignition module and relay
  5. If necessary, replace faulty components

Related codes

B212EB212FP0350

FAQ

What does the B212D code mean?

B212D is an OBD-II diagnostic trouble code that indicates: Ignition Run Only Input Circuit Open

What causes a B212D error code?

The most common causes of B212D include: Break in the wiring harness; Contact corrosion; Ignition module malfunction; Immobilizer problems.

How do I fix a B212D diagnostic trouble code?

To fix B212D: Check the wiring harness for breaks or damage. Inspect contacts for corrosion and clean if necessary.. Check the voltage in the ignition circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B212D?

Do not drive — repair immediately

How much does it cost to fix B212D?

The estimated repair cost for B212D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat