Quick Answer
P0670 means: The P0670 code indicates a malfunction in the glow plug circuit for cylinder 6 in diesel engines.
Can I drive with P0670? Immediate attention is recommended to avoid engine starting issues and further damage.
Common Questions
What does P0670 mean and how does it affect my car?
The P0670 code signifies a malfunction in the glow plug circuit for cylinder 6. This can lead to hard starting and poor fuel efficiency, especially in colder temperatures. If not addressed, it could cause further engine issues over time.
What are the most common causes of P0670 and how much does it cost to fix?
The most common causes of P0670 include a failed glow plug, faulty relay, or wiring issues. Repair costs can range from $100 to $1,500 depending on the necessary repairs.
Can I drive my car with P0670 or should I stop immediately?
It is not advisable to drive with a P0670 code, especially in cold weather. Continuing to drive can lead to severe engine starting issues and possible long-term damage.
How can I diagnose P0670 myself using GeekOBD APP?
Using the GeekOBD APP, you can perform an OBD2 scan to retrieve the P0670 code. Follow up by testing the glow plug and relay using the app’s diagnostic features to pinpoint the issue.
What vehicles are most commonly affected by P0670?
The P0670 code is commonly found in diesel engines in vehicles such as the 2011-2016 Ford F-250 Super Duty, 2008-2016 Dodge Ram 2500, and the 2007-2015 Chevrolet Silverado.
How can I prevent P0670 from happening again?
Regular maintenance of your vehicle’s electrical system, including checking glow plugs and wiring connections, can prevent the P0670 code from reappearing. Additionally, ensure that your vehicle's battery is in good condition.
What is P0670?
The DTC P0670 code indicates a malfunction in the glow plug circuit for cylinder 6, which is primarily found in diesel engines. Glow plugs are essential for starting diesel engines, especially in cold weather, as they preheat the air in the combustion chamber. A malfunction can cause hard starting, increased emissions, and poor engine performance. When the engine control module (ECM) detects that the glow plug for cylinder 6 is not operating correctly, it triggers the P0670 code. Real-world implications of this code include poor fuel economy, engine misfires, and potential damage to the engine if not addressed. Diesel engines in vehicles like the 2011-2016 Ford F-250 Super Duty, 2008-2016 Dodge Ram 2500, and 2007-2015 Chevrolet Silverado are commonly affected. If you see this code, it’s crucial to have it diagnosed and fixed promptly to avoid further complications.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0670 is present:
- Check engine light stays on consistently, indicating an issue with the glow plug system.
- Engine hesitates during acceleration, making it difficult to maintain speed, especially in cold weather.
- Fuel economy decreased by 10-15%, as the engine struggles to start and run efficiently.
- Rough idling or misfires when starting the engine, particularly noticeable in colder temperatures.
- Difficulty starting the vehicle in cold weather conditions, which can lead to frustration and delays.
Possible Causes
Most common causes of P0670 (ordered by frequency):
- The most common cause is a failed glow plug, with a likelihood of around 60%. This can happen due to wear over time or manufacturing defects.
- A faulty glow plug relay can also be responsible, which controls the power to the glow plugs. This issue has about a 25% likelihood and can lead to intermittent starting problems.
- Wiring issues, such as damaged or corroded connectors, might contribute to the P0670 code. Regular inspections can prevent these issues.
- Less common but serious causes include a malfunctioning engine control module (ECM). This can affect the entire glow plug circuit and requires specialized diagnostics.
- Rarely, a blown fuse in the glow plug circuit can trigger this code, which is easy to check and replace.
P0670 Repair Costs
Cost Breakdown by Repair Type
Glow Plug Replacement
Replacing the faulty glow plug in cylinder 6, which is the most common repair for the P0670 code.
- Total: $100 - $300
- Success rate: 85%
Wiring Repair
Repairing or replacing damaged wiring or connectors in the glow plug circuit.
- Total: $50 - $150
- Success rate: 75%
ECM Reprogramming
Reprogramming or replacing the engine control module if it’s found to be malfunctioning.
- Total: $500 - $1,500
- Success rate: 90%
Money-Saving Tips for P0670
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional P0670 Diagnosis Process
Follow these systematic steps to accurately diagnose P0670. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the glow plug and relay (20-30 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: Glow Plug Replacement in 2015 Ford F-250
Vehicle: 2015 Ford F-250 Super Duty, 80,000 miles
Problem: Customer reported hard starting in cold weather and a persistent check engine light.
Diagnosis: After scanning for codes, P0670 was retrieved. Visual inspection revealed a failed glow plug in cylinder 6.
Solution: Replaced the faulty glow plug and cleared the codes. No additional issues found.
Cost: $150 (parts and labor included)
Result: Customer reported smooth starting and improved fuel efficiency after repair.
Case Study 2: Wiring Repair on 2014 Dodge Ram 2500
Vehicle: 2014 Dodge Ram 2500, 70,000 miles
Problem: Check engine light was on, and the vehicle had rough idling.
Diagnosis: OBD scan showed P0670. Further inspection revealed corroded wiring leading to the glow plug relay.
Solution: Repaired the wiring and replaced the relay. Functionality was restored.
Cost: $120 (including parts and labor)
Result: Vehicle returned to normal operation with no further issues reported.