P0670 GMC Code - Glow Plug Module Control Circuit
Quick Answer
The glow plug controller has the ability to perform internal diagnostics for the voltage and output state of the glow plugs. Common causes include Faulty Glow Plugs, Glow Plugs harness is open or shorted, Glow Plugs circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0670 GMC indicates Glow Plug Module Control Circuit.
- Common causes
- Common causes include Faulty Glow Plugs, Glow Plugs harness is open or shorted, Glow Plugs circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0670 GMC Description
What are the Possible Causes of the DTC P0670 GMC?
- Faulty Glow Plugs
- Glow Plugs harness is open or shorted
- Glow Plugs circuit poor electrical connection
- Faulty Glow Plug Controller
How to Fix the DTC P0670 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0670 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0670 GMC Code
1. What does the OBDII code P0670 mean on a GMC vehicle?
Code P0670 indicates an issue with the Glow Plug Module Control Circuit, which manages the operation of glow plugs in diesel engines.
2. What are the common symptoms of P0670 on a GMC?
Symptoms may include difficulty starting the engine, rough idle in cold weather, reduced fuel efficiency, and an illuminated check engine light.
3. What causes the P0670 code in GMC vehicles?
Common causes include a faulty glow plug control module, damaged wiring or connectors in the control circuit, or a blown fuse.
4. Can a bad glow plug cause the P0670 code?
While the code typically points to the control module or its circuit, a bad glow plug could indirectly cause issues if it leads to electrical system strain.
5. How is the P0670 code diagnosed in GMC vehicles?
A technician will inspect the wiring and connectors, test the glow plug control module for proper operation, and may use a multimeter to check circuit continuity.
6. Can I drive my GMC with the P0670 code present?
Driving is possible, but starting the engine may be difficult in cold weather, and prolonged use without repairs could lead to further damage.
7. How do you fix the P0670 code on a GMC?
Repairs may include replacing the glow plug control module, repairing or replacing damaged wiring, or replacing blown fuses.
8. How much does it cost to fix the P0670 code on a GMC?
Costs vary but typically range from $200 to $500, depending on whether the module, wiring, or other components need replacement.
9. Can I clear the P0670 code without fixing the problem?
Clearing the code without addressing the issue may temporarily turn off the check engine light, but the code will likely return.
10. What GMC models are commonly affected by the P0670 code?
GMC diesel models such as the Sierra 2500HD or 3500HD equipped with Duramax engines are more prone to this code due to their glow plug systems.
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