What Does the P0674 Code Mean?
The P0674 code indicates an issue with the glow plug circuit for cylinder 4 in diesel engines. Glow plugs are crucial for preheating the cylinder before starting the engine, especially in cold weather. If the engine control module (PCM) detects that the glow plug for cylinder 4 is not functioning correctly, it triggers this diagnostic trouble code.
What Causes the P0674 Code?
Several factors can lead to the P0674 code, including:
- Glow plug control module failure
- Glow plug failure
- Glow plug wiring harness failure
What Are the Symptoms of the P0674 Code?
The most common symptom associated with the P0674 code is difficulty starting the engine, particularly in cold weather. Additional symptoms may include:
- Engine may not start
- Hard or no start in cold weather
How Serious Is the P0674 Code?
The P0674 code is considered urgent as it can lead to severe engine performance issues. Ignoring this code may result in extensive damage to the engine or create unsafe driving conditions.
How to Diagnose the P0674 Code
Proper diagnosis of the P0674 code involves:
- Using an OBD-II scanner to confirm the P0674 code is present.
- Inspecting the glow plug wiring harness for any damage or disconnections.
- Testing the glow plug for continuity and resistance.
- Checking the glow plug control module for proper operation.
Common Repairs for the P0674 Code
Repairs needed to resolve the P0674 code may include:
- Glow plug replacement
- Repairing or replacing the glow plug control module
- Fixing or replacing the wiring harness associated with the glow plug
How Much Does It Cost to Fix the P0674 Code?
The cost to fix the P0674 code can vary widely depending on the repair needed. Generally, glow plug replacement can range from $100 to $300, while more extensive repairs involving the control module or wiring can increase the total cost significantly, potentially exceeding $500.
Can I Fix the P0674 Code Myself?
If you have experience with automotive repairs and feel comfortable working with engine components, you may be able to diagnose and fix the P0674 code yourself. However, if you are unsure or lack the necessary tools, it’s advisable to seek professional assistance to avoid further damage to your vehicle.
