OBD Guide
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P1311

ION Sensing Module SEC Line 1 Circuit Fault

P1311 is an OBD-II diagnostic trouble code meaning: ION Sensing Module SEC Line 1 Circuit Fault. Common causes: broken or damaged sec signal line wiring, short circuit in the ion control module circuit. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • The Check Engine light comes on
  • Unstable engine idling
  • Reduced engine power
  • Increased fuel consumption
  • Possible misfires

Causes

  • Broken or damaged SEC signal line wiring
  • Short circuit in the ion control module circuit
  • Malfunction of the ion control module
  • Problems with module connector or contacts
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the SEC signal line wiring
  2. Check connections and connectors of the ion control module
  3. Carry out diagnostics of the ion control module
  4. If necessary, replace the ion control module
  5. Diagnose the engine control unit

Related codes

P1300P1312P1316

FAQ

What does the P1311 code mean?

P1311 is an OBD-II diagnostic trouble code that indicates: ION Sensing Module SEC Line 1 Circuit Fault

What causes a P1311 error code?

The most common causes of P1311 include: Broken or damaged SEC signal line wiring; Short circuit in the ion control module circuit; Malfunction of the ion control module; Problems with module connector or contacts.

How do I fix a P1311 diagnostic trouble code?

To fix P1311: Check the integrity of the SEC signal line wiring. Check connections and connectors of the ion control module. Carry out diagnostics of the ion control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1311?

Yes, but get it checked soon

How much does it cost to fix P1311?

The estimated repair cost for P1311 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat