OBD Guide
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P1491

Secondary Switch Solenoid Circuit Malfunction

P1491 is an OBD-II diagnostic trouble code meaning: Secondary Switch Solenoid Circuit Malfunction. Common causes: open or short circuit in solenoid circuit, malfunction of the solenoid itself. Estimated repair cost: $17–56.

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

Symptoms

  • Check Engine Light Is On
  • Increased fuel consumption
  • Problems starting the engine
  • Unstable engine idling
  • Smell of gasoline in the cabin

Causes

  • Open or short circuit in solenoid circuit
  • Malfunction of the solenoid itself
  • Poor contact in connectors
  • Problems with the control module
  • Contact corrosion

How to Fix

  1. Check the continuity of the solenoid circuit
  2. Check solenoid resistance
  3. Inspect connectors and contacts for corrosion
  4. Replace faulty solenoid if necessary
  5. Reset the error code and check if it returns

Related codes

P1490P1492P0446

Error P1491 by Vehicle Brand

AcuraDodgeHondaInfinitiJeepNissanPlymouthPontiac

FAQ

What does the P1491 code mean?

P1491 is an OBD-II diagnostic trouble code that indicates: Secondary Switch Solenoid Circuit Malfunction

What causes a P1491 error code?

The most common causes of P1491 include: Open or short circuit in solenoid circuit; Malfunction of the solenoid itself; Poor contact in connectors; Problems with the control module.

How do I fix a P1491 diagnostic trouble code?

To fix P1491: Check the continuity of the solenoid circuit. Check solenoid resistance. Inspect connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1491?

Yes, but get it checked soon

How much does it cost to fix P1491?

The estimated repair cost for P1491 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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