Quick Answer
P0673 means: P0673 indicates a high voltage condition in the glow plug circuit for cylinder 3.
Can I drive with P0673? Immediate attention is recommended to prevent starting issues and engine performance problems.
Common Questions
What does P0673 mean and how does it affect my car?
The P0673 code signifies a problem in the glow plug circuit for cylinder 3, which is crucial for starting a diesel engine. If this code is present, you may experience hard starts, especially in cold weather, along with poor fuel economy and increased emissions.
What are the most common causes of P0673 and how much does it cost to fix?
The most common causes include a faulty glow plug, damaged wiring, or issues with the ECM. Repair costs can range from $100 to $300 for glow plug replacement, while wiring repairs might cost between $80 and $200.
Can I drive my car with P0673 or should I stop immediately?
While it’s possible to drive with the P0673 code, it’s not advisable as it can lead to starting difficulties and poor engine performance. It’s best to address the issue promptly to avoid potential breakdowns.
How can I diagnose P0673 myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for codes, view freeze frame data, and check the live data of the glow plug circuit. This will help you pinpoint the issue more effectively before seeking repairs.
What vehicles are most commonly affected by P0673?
P0673 is commonly seen in diesel vehicles like the 2008-2010 Ford Super Duty trucks and 2003-2006 Dodge Ram models. Always check for any recalls or TSBs related to the glow plug system.
How can I prevent P0673 from happening again?
Regular maintenance of your diesel engine, including timely glow plug checks and inspections of the wiring, can help prevent the recurrence of the P0673 code. Keeping your engine clean and addressing issues promptly also plays a crucial role.
What is P0673?
The Diagnostic Trouble Code (DTC) P0673 indicates an issue with the glow plug circuit of a diesel engine. Specifically, it signifies a high voltage condition detected in the glow plug circuit for cylinder 3. Glow plugs are essential in diesel engines as they help in heating the combustion chamber for easier cold starting. If your vehicle has this code, it often means that the glow plug for cylinder 3 is either faulty or there may be a problem with the circuit itself, such as damaged wiring or a bad connection. Common symptoms include hard starting, increased emissions, and rough engine operation, especially in colder temperatures. Ignoring this code can lead to longer crank times and poor fuel efficiency. The P0673 code is frequently seen in diesel engines of various makes and models, particularly in Ford Super Duty trucks from 2008 to 2010 and Dodge Ram models from 2003 to 2006. If you experience this code, it’s important to address it promptly to avoid further complications and ensure your engine runs smoothly.
System: P - Powertrain (Engine, Transmission, Emissions)
Symptoms
Common symptoms when P0673 is present:
- Check engine light stays on constantly, indicating an ongoing issue.
- Engine hesitates during acceleration, especially noticeable when starting from a stop.
- Fuel economy decreased by 10-15%, leading to more frequent visits to the pump.
- Difficulty starting the engine in cold weather, which can lead to frustration and potential engine wear.
- Rough idling or misfiring, making the vehicle feel unsteady and uncomfortable during operation.
Possible Causes
Most common causes of P0673 (ordered by frequency):
- Faulty glow plug - This is the most common cause, accounting for about 70% of cases. If the glow plug for cylinder 3 is malfunctioning, it can lead to poor engine performance.
- Damaged wiring or connections - Corroded or damaged wires in the glow plug circuit can create high resistance, leading to this code. Proper inspection of the wiring is crucial.
- Faulty engine control module (ECM) - While less common, a malfunctioning ECM can misinterpret signals and trigger the P0673 code. This requires in-depth diagnostic assessment.
- Failed relay - A bad relay in the glow plug system can prevent proper voltage from reaching the glow plug. This is less common but can cause significant issues.
- Short circuit in the glow plug circuit - A rare but serious condition that can lead to greater electrical issues if not addressed quickly.
P0673 Repair Costs
Cost Breakdown by Repair Type
Glow Plug Replacement
Replacing the faulty glow plug for cylinder 3.
- Total: $100 - $300
- Success rate: 90%
Wiring Repair
Repairing or replacing damaged wiring in the glow plug circuit.
- Total: $80 - $200
- Success rate: 85%
Money-Saving Tips for P0673
- 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 P0673 Diagnosis Process
Follow these systematic steps to accurately diagnose P0673. 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 to test the voltage at the glow plug and verify the integrity of the wiring (20-30 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes to confirm the issue has been resolved (10-15 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to ensure the issue is fully resolved (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 on 2008 Ford F-250
Vehicle: 2008 Ford F-250, 120,000 miles
Problem: Customer reported hard starting and check engine light.
Diagnosis: Diagnostic scan revealed P0673. Visual inspection confirmed a faulty glow plug.
Solution: Replaced the glow plug for cylinder 3 and cleared the code.
Cost: $200 (part $100, labor $100)
Result: Customer reported improved starting performance and no recurrence of the code.
Case Study 2: Wiring Repair on 2005 Dodge Ram 2500
Vehicle: 2005 Dodge Ram 2500, 150,000 miles
Problem: Check engine light and rough idling.
Diagnosis: P0673 was diagnosed alongside worn wiring in the glow plug circuit.
Solution: Repaired damaged wiring and replaced the glow plug.
Cost: $150 (part $50, labor $100)
Result: Vehicle performance improved significantly, and the check engine light remained off.