RAM Truck Error Code P0674: How to Fix It

Q: Can I drive my RAM truck with error code P0674?

You can drive short distances, but the truck may have difficulty starting in cold weather. The engine may run rough during cold starts and produce white smoke. It's best to fix this issue promptly to avoid potential engine damage.

Q: How much does it cost to fix P0674 on a RAM truck?

If it's just a faulty glow plug, expect to pay $50-150 for parts and labor. If wiring repairs are needed, costs can range from $200-500 depending on the extent of the damage. Diagnostic fees typically run $100-150.

Q: What causes glow plugs to fail in RAM trucks?

Common causes include normal wear from heat cycles, carbon buildup, electrical system issues, poor fuel quality, and age. Glow plugs typically last 80,000-120,000 miles depending on driving conditions and maintenance.

Q: Will P0674 cause my RAM truck to fail emissions testing?

Yes, any active diagnostic trouble code will typically cause an emissions test failure. The code must be resolved and the system must complete its readiness monitors before passing emissions testing.

Abstract

The P0674 error code in your RAM truck indicates a problem with the glow plug circuit for cylinder 4. This code appears when the powertrain control module (PCM) detects an electrical issue in the glow plug system, which is essential for diesel engine cold starts.