p0670 glow plug module control circuit
P0670 Glow Plug Module Control Circuit
Description: The P0670 code indicates an issue with the glow plug module control circuit, which is responsible for controlling the operation of the glow plugs in a diesel engine.
Definition: This diagnostic trouble code (DTC) is triggered when the Engine Control Module (ECM) detects a malfunction in the electrical circuit that controls the glow plug module. This can be due to wiring issues, a faulty glow plug module, or problems within the ECM itself.
p0670 – Glow Plug Module Control Circuit
Severity: Moderate
Common Causes
P0670 – Glow Plug Module Control Circuit
Common causes:
- Faulty glow plug module
- Defective glow plugs
- Wiring issues in the glow plug circuit
- Corroded or loose electrical connections
- Faulty engine control module (ECM)
Common Misdiagnosis
OBD2 Code: P0670
Description: Glow Plug Module Control Circuit
Common Misdiagnosis: Replacing the glow plugs themselves instead of diagnosing issues with the control module or wiring.
Common Diagnostic Steps
OBD2 Code: P0670
Description: Glow Plug Module Control Circuit
Common Diagnostic Steps:
- Check the glow plug control module for any visible damage or corrosion.
- Inspect the wiring and connectors associated with the glow plug circuit for signs of wear, damage, or disconnection.
- Use a multimeter to test the voltage and continuity in the glow plug circuit to ensure proper electrical flow.
- Verify that the battery is fully charged and functioning correctly, as low voltage can affect the glow plug system.
- Test each individual glow plug for resistance using an ohmmeter; replace any plugs that do not meet specifications.
- Examine related fuses and relays to ensure they are operational and properly seated.
- If equipped, use an OBD2 scanner to clear the code and perform a road test to see if it returns after repairs are made.