OBD Guide
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P16B1

Engine Control Module Self-Test Idle Air Control System Fault

P16B1 is an OBD-II diagnostic trouble code meaning: Engine Control Module Self-Test Idle Air Control System Fault. Common causes: idle air control valve (iac) malfunction, open or short circuit in the idle air valve circuit. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Unstable idle speed
  • Floating engine speed
  • Stalls at idle
  • High or low idle speed
  • Check Engine light comes on

Causes

  • Idle Air Control Valve (IAC) Malfunction
  • Open or short circuit in the idle air valve circuit
  • Throttle valve contamination
  • Problems with the engine ECU
  • Air leaks in the intake tract

How to Fix

  1. Check and clean the idle air valve
  2. Check the electrical circuit of the valve for opens and shorts
  3. Clean throttle body
  4. Check the tightness of the intake tract
  5. If necessary, replace the idle air valve

Related codes

P0505P0506P0507

FAQ

What does the P16B1 code mean?

P16B1 is an OBD-II diagnostic trouble code that indicates: Engine Control Module Self-Test Idle Air Control System Fault

What causes a P16B1 error code?

The most common causes of P16B1 include: Idle Air Control Valve (IAC) Malfunction; Open or short circuit in the idle air valve circuit; Throttle valve contamination; Problems with the engine ECU.

How do I fix a P16B1 diagnostic trouble code?

To fix P16B1: Check and clean the idle air valve. Check the electrical circuit of the valve for opens and shorts. Clean throttle body. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P16B1?

Yes, but get it checked soon

How much does it cost to fix P16B1?

The estimated repair cost for P16B1 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat