P2679 serious

Actuator Supply Voltage 'D' Circuit Low

The P2679 code means the vehicle's onboard diagnostic system has detected: Actuator Supply Voltage 'D' Circuit Low. This is a serious severity code.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$100 - $500 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Fourth actuator group underperforming
  • Multiple system faults possible
  • Engine may run in reduced power mode
  • Instrument cluster warnings

Probable Causes (Ranked by Likelihood)

  • Battery terminal corrosion reducing voltage Very High
  • Failing alternator not maintaining voltage High
  • High resistance in circuit D supply wire Moderate
  • PCM supply D circuit degradation Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2679 is stored

  2. Clean battery terminals and test voltage

  3. Load test alternator output

  4. Measure circuit D voltage at PCM and compare to battery voltage

Frequently Asked Questions

What does P2679 mean?

P2679 indicates an issue with the actuator supply voltage 'd' circuit low. This voltage circuit powers various engine actuators and sensors critical for proper engine operation.

Can I drive with a P2679 code?

You can drive short distances, but multiple engine systems may be affected. Have the charging and wiring systems checked promptly.

How much does it cost to fix P2679?

Repairs typically cost $100 - $500. A blown fuse is a quick fix, while alternator or wiring repairs cost more.

Sources

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

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