The P1670 diagnostic trouble code (DTC) is a common issue in Ford's 7.3 Powerstroke diesel engines. It indicates an Electronic Feedback (EF) signal not detected between the Injector Driver Module (IDM) and the Powertrain Control Module (PCM). This communication failure can lead to engine performance problems, including starting issues and irregular operation.
Understanding the P1670 Code
The P1670 code is triggered when the PCM fails to receive feedback from the IDM, which controls fuel injector timing and performance. Below is an overview of the key components:
| Component | Function |
|---|---|
| Injector Driver Module (IDM) | Manages fuel injector timing and sends feedback signals to the PCM. |
| Powertrain Control Module (PCM) | Acts as the engine's brain, processing data for optimal performance. |
Common Symptoms of P1670 Code
- Check Engine Light: Illuminated on the dashboard.
- Engine Starting Issues: Difficulty starting or complete failure to start.
- Irregular RPM: Fluctuating RPMs leading to rough idling or stalling.
- Poor Performance: Reduced power and sluggish acceleration.
- Fuel Gauge Malfunction: Incorrect readings, such as empty when fuel is present.
Diagnosing the P1670 Code
A systematic approach is essential for diagnosing this issue effectively. Follow these steps:
- Initial Scan: Use an OBD-II scanner to confirm the presence of code P1670 and any related codes.
- Visual Inspection: Check wiring harnesses for damage, corrosion, or loose connections.
- Test Fuses and Relays: Inspect IDM-related fuses and relays for continuity and proper operation.
- IDM Voltage Check: Use a multimeter to ensure the IDM is receiving adequate power.
- Inspect Components: Examine both IDM and PCM for faults or malfunctions.
"When my truck displayed a P1670 code, it turned out to be corroded IDM connectors causing intermittent communication issues"
Resolving the P1670 Code
Step-by-Step Solutions
- Repair Wiring Issues: Replace damaged wires or harnesses.
- Replace Faulty Components: Swap out defective IDM or PCM with OEM parts.
- Clean Connectors: Remove corrosion from connectors using electrical contact cleaner.
- Replace Fuses/Relays: Install new fuses or relays as needed.
- Professional Assistance: Seek help if DIY efforts fail to resolve the issue.
"Replacing my IDM with an OEM part resolved my truck's starting issues completely"
Preventive Measures
- Regular Maintenance: Inspect wiring and connectors during routine servicing.
- Avoid Aftermarket Parts: Use OEM components for better compatibility and reliability.
- Shelter Your Vehicle: Protect your truck from extreme weather conditions that can cause corrosion.
FAQs
- What does the P1670 code mean?
The code indicates a communication failure between the PCM and IDM due to a missing EF signal. - Can I drive with a P1670 code?
No, as it can lead to severe performance issues or prevent the engine from starting altogether. - How much does it cost to fix?
The cost varies but typically ranges from $200-$800 depending on parts and labor. - Can I fix this issue myself?
You can attempt basic repairs like checking fuses and connectors; however, complex issues may require professional help. - What tools are needed for diagnosis?
An OBD-II scanner, multimeter, and basic hand tools are essential for troubleshooting.