OBD Guide
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P1801

Variable Intake Air System Control Solenoid Valve 2

P1801 is an OBD-II diagnostic trouble code meaning: Variable Intake Air System Control Solenoid Valve 2. Common causes: solenoid valve no. 2 malfunction, open or short circuit in control circuit. Estimated repair cost: $17–56.

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

Symptoms

  • Loss of engine power
  • Unstable idling
  • Increased fuel consumption
  • Check Engine Light Illuminates
  • Engine does not reach full power

Causes

  • Solenoid valve No. 2 malfunction
  • Open or short circuit in control circuit
  • Problems with vacuum hoses or connections
  • Mechanical failure of the damper drive
  • Engine control unit malfunction

How to Fix

  1. Check valve control circuit integrity
  2. Test the resistance and operation of valve No. 2
  3. Inspect vacuum hoses for cracks and air leaks
  4. Check the intake manifold flap mechanism
  5. Replace faulty solenoid valve if necessary

Related codes

P1800P1802P2004

Error P1801 by Vehicle Brand

BuickCadillacChevroletGMGMCOldsmobileSaturn

FAQ

What does the P1801 code mean?

P1801 is an OBD-II diagnostic trouble code that indicates: Variable Intake Air System Control Solenoid Valve 2

What causes a P1801 error code?

The most common causes of P1801 include: Solenoid valve No. 2 malfunction; Open or short circuit in control circuit; Problems with vacuum hoses or connections; Mechanical failure of the damper drive.

How do I fix a P1801 diagnostic trouble code?

To fix P1801: Check valve control circuit integrity. Test the resistance and operation of valve No. 2. Inspect vacuum hoses for cracks and air leaks. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1801?

Yes, but get it checked soon

How much does it cost to fix P1801?

The estimated repair cost for P1801 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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