The P1670 code in a 7.3 Powerstroke engine indicates an Electronic Feedback (EF) Signal Not Detected. This code is crucial for diagnosing issues related to the communication between the Powertrain Control Module (PCM) and the Injector Driver Module (IDM). Understanding this code is essential for vehicle owners and mechanics alike, as it can lead to significant performance issues if not addressed promptly.

What Does P1670 Code Mean?

The P1670 code means that the PCM is unable to receive the feedback signal from the IDM. This lack of communication can result in various operational problems, including:

  • Engine not starting
  • Reduced power
  • Stalling
  • Poor fuel economy

These symptoms are critical indicators that something is wrong within the engine's electronic systems.

Common Causes of P1670 Code

Several factors can trigger the P1670 code. Here are the most common causes:

  • Damaged Injector Driver Module Relay
  • Open or shorted IDM enable circuit
  • Open or short in the Electric Feedback circuit
  • Open or short in the Fuel Delivery Command Signal (FDCS) circuit
  • Blown fuses related to the IDM
  • Faulty Injector Driver Module itself

Addressing these issues promptly can prevent further damage to your vehicle's engine system.

Symptoms Associated with P1670 Code

When the P1670 code is present, you may notice several symptoms, including:

  • Service Engine Soon warning light illuminated
  • Irregular RPM readings
  • Engine won’t start or starts hard

Recognizing these symptoms early can help in diagnosing the problem more effectively.

Troubleshooting Steps for P1670 Code

To resolve the P1670 error code, follow these troubleshooting steps:

1. Check Fuses and Relays: Inspect all fuses related to the IDM and replace any that are blown. Also, check the IDM relay for proper operation.

2. Inspect Wiring: Look for damaged or corroded wiring in the circuits connected to the IDM and PCM. Repair or replace any faulty wiring.

3. Perform KOEO Self-Test: Conduct a Key On Engine Off (KOEO) self-test to identify any additional trouble codes that may be present.

4. Replace IDM if Necessary: If other solutions do not resolve the issue, consider replacing the Injector Driver Module, especially if diagnostic codes like P1298 are also present.

5. Consult a Professional: If you're unable to diagnose or fix the issue, it may be beneficial to consult with a professional mechanic who specializes in diesel engines.

Cost of Repairs

The costs associated with resolving a P1670 error can vary based on what components need replacement:

ComponentEstimated Cost
Automotive Fuses$110 - $140
IDM Relay$30 each
IDM Replacement$250 - $400

Labor costs can also add an additional $75 to $150 per hour if you choose not to perform repairs yourself.

Conclusion

The P1670 code in a 7.3 Powerstroke engine signals an important communication issue between critical engine components. By understanding its implications and following appropriate troubleshooting steps, vehicle owners can address this problem effectively and maintain optimal engine performance.

FAQs About P1670 Code

    • What should I do if my engine won't start and I have a P1670 code?
      Check fuses and wiring first, then consider replacing the IDM if necessary.
    • Can I drive my vehicle with a P1670 code?
      It's not advisable as it may lead to further damage; address it as soon as possible.
    • How do I clear the P1670 code?
      You can clear it using an OBD-II scanner after addressing any underlying issues.