OBD Guide
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P3078

Throttle Control Airflow At Idle Too Low

P3078 is an OBD-II diagnostic trouble code meaning: Throttle Control Airflow At Idle Too Low. Common causes: throttle valve contamination, throttle position sensor malfunction. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Unstable engine idling
  • Increased vibrations
  • Reduced engine power
  • Stalls at idle
  • Check Engine light comes on

Causes

  • Throttle valve contamination
  • Throttle Position Sensor Malfunction
  • Air leaks in the intake tract
  • Problems with the throttle wiring harness
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check and clean the throttle valve
  2. Check throttle position sensor
  3. Check the intake tract for air leaks
  4. Check wiring harness and connections
  5. Reset throttle adaptations

Related codes

P3077P3079P3080

FAQ

What does the P3078 code mean?

P3078 is an OBD-II diagnostic trouble code that indicates: Throttle Control Airflow At Idle Too Low

What causes a P3078 error code?

The most common causes of P3078 include: Throttle valve contamination; Throttle Position Sensor Malfunction; Air leaks in the intake tract; Problems with the throttle wiring harness.

How do I fix a P3078 diagnostic trouble code?

To fix P3078: Check and clean the throttle valve. Check throttle position sensor. Check the intake tract for air leaks. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P3078?

Yes, but get it checked soon

How much does it cost to fix P3078?

The estimated repair cost for P3078 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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