P2660 moderate

Cylinder 1 Deactivation Solenoid Control Circuit Open

The P2660 code means the vehicle's onboard diagnostic system has detected: Cylinder 1 Deactivation Solenoid Control Circuit Open. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$300 - $2000 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Engine cannot enter fuel-saving cylinder deactivation mode
  • Reduced fuel economy on highway
  • Rough transition between V8 and V4 modes
  • Ticking or lifter noise from affected cylinder

Probable Causes (Ranked by Likelihood)

  • Open circuit in deactivation solenoid wiring Very High
  • Failed cylinder deactivation (AFM/MDS) solenoid High
  • Lifter collapse on deactivation cylinder Moderate
  • ECM driver circuit failure Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2660 is present

  2. Test deactivation solenoid resistance

  3. Check wiring from ECM to solenoid for open circuits

  4. Perform cylinder deactivation system test with scan tool

Frequently Asked Questions

What does P2660 mean?

P2660 indicates a problem with the cylinder 1 deactivation solenoid control circuit open. This affects the vehicle's ability to deactivate cylinders for improved fuel economy.

Can I drive with a P2660 code?

You can drive short distances. The cylinder deactivation system will be disabled, reducing fuel economy. Have it checked to prevent potential lifter damage.

How much does it cost to fix P2660?

Repairs typically cost $300 - $2000. Simple solenoid replacement is less expensive, but collapsed lifter repair can be $2,000 or more.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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