What are the common causes of P064C?

A failed glow plug control module. A wiring fault between the module and the glow plugs. Corrosion at the module connector. A failed glow plug dragging the module. A faulty ECM command to the module.

Scan the glow plug module for other codes. Inspect the module connector and glow plug wiring. Test each glow plug resistance. Check the module output to the glow plugs. Replace the glow plug control module if the output is dead. Clear the code and retest.

P064C

Glow Plug Control Module 1

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P064C means Glow Plug Control Module 1.

Where it lives

For P064C, start at the module the description names.

Check these first

A failed glow plug control module
A wiring fault between the module and the glow plugs
Corrosion at the module connector
A failed glow plug dragging the module
A faulty ECM command to the module

What to do next

Scan the glow plug module for other codes
Inspect the module connector and glow plug wiring
Test each glow plug resistance
Check the module output to the glow plugs
Replace the glow plug control module if the output is dead
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.