P2680 serious

Glow Plug Control Module Circuit Open

The P2680 code means the vehicle's onboard diagnostic system has detected: Glow Plug Control Module Circuit Open. This is a serious severity code.

My Garage →
Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$200 - $800 (parts and labor)
Recommended Tool
ANCEL AD310 OBD-II Scanner

Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Every Tech Needs This
AstroAI Digital Multimeter

Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Common Symptoms

  • Check Engine Light on
  • Glow plug indicator light stays on or does not illuminate
  • Hard starting in cold weather
  • Excessive white smoke on cold start
  • Rough idle when cold

Probable Causes (Ranked by Likelihood)

  • Open circuit in glow plug control module wiring Very High
  • Failed glow plug control module High
  • Blown fuse for glow plug circuit Moderate
  • PCM communication fault to glow plug module Low

Step-by-Step Diagnostic Procedure

  1. Read freeze frame data and confirm P2680 is present

  2. Check glow plug system fuses and relays

  3. Test glow plug control module power and ground supply

  4. Scan for communication DTCs between PCM and glow plug module

Frequently Asked Questions

What does P2680 mean?

P2680 indicates a problem with the glow plug control module circuit open. Glow plugs are essential for cold-starting diesel engines by preheating the combustion chambers.

Can I drive with a P2680 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 P2680?

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.

Explore More

Search codes Vehicle-specific fixes Guides By make

Was this helpful?

Share carcodefinder.com with a friend who needs to decode their check engine light.

Browse by symptom → Read repair guides → Fixes by vehicle →