What does fault code P0670 mean?

Glow Plug Module Control Circuit Malfunction. Diesel-specific: the glow plug control module circuit has a fault.

P0670

Glow Plug Module Control Circuit Malfunction

Q: What are the symptoms of P0670?

Hard cold starting; White smoke on startup; CEL

Q: What are the possible causes of P0670?

Failed glow plug control module; Wiring issue; Blown fuse

Q: How to fix P0670?

Test module operation and wiring; Replace control module if faulty

Severity: Medium Ignition System Generic OBD-II Code Est. Repair: $150 - $500

Schedule diagnosis soon. Continued driving may worsen the issue.

Quick Answer

P0670 means “Glow Plug Module Control Circuit Malfunction.” Severity: Medium. Estimated repair cost: $150 - $500. Most common sign: Hard cold starting.

What Does P0670 Mean?

Diesel-specific: the glow plug control module circuit has a fault.

Common Symptoms

Hard cold starting

White smoke on startup

CEL

Possible Causes

Failed glow plug control module

Wiring issue

Blown fuse

How to Fix P0670 – Repair Guide

Test module operation and wiring

Replace control module if faulty

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Budgeting for This Repair?

A typical P0670 repair runs about $150 - $500. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.