P2674 serious

Actuator Supply Voltage 'B' Circuit Low

The P2674 code means the vehicle's onboard diagnostic system has detected: Actuator Supply Voltage 'B' 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
  • Secondary engine actuators underperforming
  • Reduced system efficiency
  • Possible idle fluctuations
  • Secondary emissions systems may fault

Probable Causes (Ranked by Likelihood)

  • Low system voltage affecting circuit B Very High
  • High resistance connection in supply B wiring High
  • Corroded terminal in junction box Moderate
  • PCM internal regulator B failure Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2674 is stored

  2. Test battery and charging system voltage

  3. Measure supply voltage B at multiple test points

  4. Clean and tighten all ground and power connections

Frequently Asked Questions

What does P2674 mean?

P2674 indicates an issue with the actuator supply voltage 'b' circuit low. This voltage circuit powers various engine actuators and sensors critical for proper engine operation.

Can I drive with a P2674 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 P2674?

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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