OBD Guide
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P1C16

Idle Control System RPM Lower Than Expected

P1C16 is an OBD-II diagnostic trouble code meaning: Idle Control System RPM Lower Than Expected. Common causes: idle air valve is dirty or faulty, air leak in the intake tract. Estimated repair cost: $17–67.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–67 (est.)

Symptoms

  • Low idle speed
  • Engine stalls at idle
  • Increased engine vibration
  • Unstable engine operation
  • Difficulty starting

Causes

  • Idle air valve is dirty or faulty
  • Air leak in the intake tract
  • Problems with the throttle position sensor
  • Air filter clogged
  • Malfunction of the mass air flow sensor (MAF)

How to Fix

  1. Check and clean the idle air valve
  2. Check the intake tract for air leaks
  3. Check the condition of the air filter
  4. Diagnose the throttle position sensor
  5. Check the performance of the mass air flow sensor

Related codes

P0505P0506P0507

FAQ

What does the P1C16 code mean?

P1C16 is an OBD-II diagnostic trouble code that indicates: Idle Control System RPM Lower Than Expected

What causes a P1C16 error code?

The most common causes of P1C16 include: Idle air valve is dirty or faulty; Air leak in the intake tract; Problems with the throttle position sensor; Air filter clogged.

How do I fix a P1C16 diagnostic trouble code?

To fix P1C16: Check and clean the idle air valve. Check the intake tract for air leaks. Check the condition of the air filter. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1C16?

Yes, but get it checked soon

How much does it cost to fix P1C16?

The estimated repair cost for P1C16 is $17–67. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat