OBD Guide
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P122B

Intake Air Flow Valve Control Supply Voltage Circuit

P122B is an OBD-II diagnostic trouble code meaning: Intake Air Flow Valve Control Supply Voltage Circuit. Common causes: open or short circuit in valve control circuit, solenoid valve malfunction. Estimated repair cost: $17–56.

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

Symptoms

  • Unstable engine idling
  • Reduced engine power
  • Increased fuel consumption
  • Check Engine Light Illuminates
  • Dips during acceleration

Causes

  • Open or short circuit in valve control circuit
  • Solenoid valve malfunction
  • Problems with the relay or circuit fuse
  • Oxidation of contacts in connectors
  • Engine ECU malfunction

How to Fix

  1. Check the integrity of fuses and relays
  2. Inspect the wiring harness for damage
  3. Check valve resistance and operation
  4. Clean contacts in connectors
  5. Scan the ECU for additional errors

Related codes

P122AP122CP122D

FAQ

What does the P122B code mean?

P122B is an OBD-II diagnostic trouble code that indicates: Intake Air Flow Valve Control Supply Voltage Circuit

What causes a P122B error code?

The most common causes of P122B include: Open or short circuit in valve control circuit; Solenoid valve malfunction; Problems with the relay or circuit fuse; Oxidation of contacts in connectors.

How do I fix a P122B diagnostic trouble code?

To fix P122B: Check the integrity of fuses and relays. Inspect the wiring harness for damage. Check valve resistance and operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P122B?

Yes, but get it checked soon

How much does it cost to fix P122B?

The estimated repair cost for P122B is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat