OBD Guide
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P1661

MIL Control Circuit Conditions

P1661 is an OBD-II diagnostic trouble code meaning: MIL Control Circuit Conditions. Common causes: open or short circuit in mil control circuit, engine control module (ecm) malfunction. Estimated repair cost: $6–56.

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

Symptoms

  • Check engine light does not come on when starting
  • The check engine light is constantly on
  • Check engine light flashes
  • Unable to read fault codes

Causes

  • Open or short circuit in MIL control circuit
  • Engine control module (ECM) malfunction
  • Problems with connectors or wiring
  • MIL lamp failure
  • Power or grounding problems

How to Fix

  1. Check the integrity of wiring and connectors in the MIL circuit
  2. Check the MIL lamp on the instrument panel
  3. Check MIL circuit power and ground
  4. Flash or replace engine control module (ECM)

Related codes

P1660P1662P1663

Error P1661 by Vehicle Brand

BuickCadillacChevroletFordGMGMCLincolnMercuryOldsmobileSaturnToyota

FAQ

What does the P1661 code mean?

P1661 is an OBD-II diagnostic trouble code that indicates: MIL Control Circuit Conditions

What causes a P1661 error code?

The most common causes of P1661 include: Open or short circuit in MIL control circuit; Engine control module (ECM) malfunction; Problems with connectors or wiring; MIL lamp failure.

How do I fix a P1661 diagnostic trouble code?

To fix P1661: Check the integrity of wiring and connectors in the MIL circuit. Check the MIL lamp on the instrument panel. Check MIL circuit power and ground. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1661?

Yes, but get it checked soon

How much does it cost to fix P1661?

The estimated repair cost for P1661 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat