P2682 moderate

Glow Plug Control Module Circuit High

The P2682 code means the vehicle's onboard diagnostic system has detected: Glow Plug Control Module Circuit High. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$200 - $800 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Glow plugs may stay energized too long
  • Possible glow plug overheating
  • Burning smell from engine bay
  • Glow plug indicator stays on after warm-up

Probable Causes (Ranked by Likelihood)

  • Short to battery voltage in glow plug module circuit Very High
  • Failed glow plug control module stuck on High
  • Wiring short near battery or alternator Moderate
  • PCM stuck commanding glow plug module Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2682 is present

  2. Measure glow plug control module supply voltage

  3. Check for wiring shorts to battery positive

  4. Monitor glow plug on-time with scan tool to check for excessive duration

Frequently Asked Questions

What does P2682 mean?

P2682 indicates a problem with the glow plug control module circuit high. Glow plugs are essential for cold-starting diesel engines by preheating the combustion chambers.

Can I drive with a P2682 code?

You can drive short distances once the engine is running. The main issue is cold starting difficulty. In warm weather, the effect is minimal, but cold weather starting will be significantly impacted.

How much does it cost to fix P2682?

Repairs typically cost $200 - $800. Individual glow plugs are $20 to $50 each, but labor can be significant if they are seized in the cylinder head.

Sources

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

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