OBD Guide
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P16B2

Engine Control Module Self-Test Idle Air Control System Fault

P16B2 is an OBD-II diagnostic trouble code meaning: Engine Control Module Self-Test Idle Air Control System Fault. Common causes: idle air valve malfunction, open or short circuit in control circuit. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • Unstable idle speed
  • Engine stalls at idle
  • Floating speed when warming up
  • Increased vibrations at idle
  • Check Engine light comes on

Causes

  • Idle air valve malfunction
  • Open or short circuit in control circuit
  • Idle channel contamination
  • Air leaks in the intake manifold
  • ECU software error

How to Fix

  1. Check the condition of the idle air valve
  2. Check the integrity of the wiring harness and connectors
  3. Clean the idle air passage and valve
  4. Check the intake tract for air leaks
  5. Flash or replace the ECU if necessary

Related codes

P0505P0506P0507

FAQ

What does the P16B2 code mean?

P16B2 is an OBD-II diagnostic trouble code that indicates: Engine Control Module Self-Test Idle Air Control System Fault

What causes a P16B2 error code?

The most common causes of P16B2 include: Idle air valve malfunction; Open or short circuit in control circuit; Idle channel contamination; Air leaks in the intake manifold.

How do I fix a P16B2 diagnostic trouble code?

To fix P16B2: Check the condition of the idle air valve. Check the integrity of the wiring harness and connectors. Clean the idle air passage and valve. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16B2?

Yes, but get it checked soon

How much does it cost to fix P16B2?

The estimated repair cost for P16B2 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat