P1670 Ford Code - Electronic Feedback Signal Not Detected
Quick Answer
The Injector Driver Module (IDM) provides the EF output signal to the Powertrain Control Module (PCM) to confirm that proper timing/duration of Fuel Delivery Command Signal (FDCS) was received. Common causes include Open fuse, Faulty Injector Driver Module (IDM) relay, Open or shorted Injector Driver Module (IDM) enable circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1670 Ford indicates Electronic Feedback Signal Not Detected.
- Common causes
- Common causes include Open fuse, Faulty Injector Driver Module (IDM) relay, Open or shorted Injector Driver Module (IDM) enable circuit.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1670 Ford Description
What are the Possible Causes of the DTC P1670 Ford?
- Open fuse
- Faulty Injector Driver Module (IDM) relay
- Open or shorted Injector Driver Module (IDM) enable circuit
- Open/short in EF circuit
- Open/short in Fuel Delivery Command Signal (FDCS) circuit
- Injector Driver Module (IDM) powering circuits
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P1670 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1670 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1670 Ford Code
What does the OBDII code P1670 mean on a Ford vehicle?
P1670 indicates that the Electronic Feedback Signal from the fuel injection system is not detected by the Engine Control Module (ECM).
What are the common symptoms of P1670 on a Ford?
Symptoms may include difficulty starting the engine, poor acceleration, reduced fuel efficiency, or the Check Engine Light being illuminated.
What causes the P1670 code to appear on a Ford?
Common causes include a malfunctioning fuel injector driver module (FIDM), wiring issues, poor electrical connections, or a faulty Engine Control Module (ECM).
Can a damaged fuel injector driver module trigger the P1670 code?
Yes, a defective fuel injector driver module is one of the most frequent causes of the P1670 code.
How can I diagnose the P1670 code on my Ford?
Start by inspecting the wiring and connectors to the FIDM, and test the module itself. Use a scan tool to check for related codes and monitor the feedback signal.
Is it safe to drive with the P1670 code present?
Driving with this code may lead to poor engine performance and potential damage to other components. It’s best to address the issue promptly.
How do I fix the P1670 code on a Ford vehicle?
Repairs may involve replacing or repairing the fuel injector driver module, fixing damaged wiring or connectors, or reprogramming the ECM if necessary.
Will clearing the P1670 code solve the problem permanently?
Clearing the code may temporarily remove the warning light, but the underlying issue must be resolved to prevent the code from returning.
Can a weak battery cause the P1670 code to appear?
While uncommon, a weak battery or electrical system issues could disrupt the feedback signal, contributing to this code.
Should I take my Ford to a mechanic for the P1670 code?
If you're unfamiliar with diagnosing and repairing fuel injection systems, it’s advisable to seek professional assistance to properly address the issue.
Discuss the causes and fixes for P1670 Ford OBDII Code
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The problem means that there is no communication between the Powertrain Control Module (PCM) and the Injector Driver Module (IDM), most of the times the problem is a faulty IDM.
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Same issue, I've replaced my IDM, truck runs fine but when warm it will struggle to start on the first turn over
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I have a 2002 F350 7.3L that gave codes 1613 ,1670. I changed the IDM wiring and valve cover gaskets. Cleared the code. But truck will still not crank. But only gives code 1670 now. What did I do wrong? What to check next?
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I haven't had that problem before, but I checked a national database of repairs for your same model and year, and by far the most common cause for your problem is the Camshaft Position Sensor, followed by the IDM, but you already replaced that.
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Hey everybody I have a 1999 Ford F-350 Super Duty 7.3 powerstroke diesel transmission went out on me pulling my fifth wheel I changed the torque converter cuz it was bad put it all back in it didn't want to go anywhere until I put it in four wheel drive and put it in reverse and gave it a gas brake gas brake check and then put it in the drive and then it gripped and I took off but now since I have tried to turn around on my property it's stuck where it's at now again and I can't get it to go back into drive can anybody tell me what the problem is and it's throwing no codes except for a p1670 please help
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It sounds like you're facing a complex issue with your transmission. Let's break down the problem step by step.
DTC Code: P1670 (PCM Error)
The P1670 code on a 1999 Ford F-350 Super Duty with the 7.3 Powerstroke Diesel generally indicates a PCM (Powertrain Control Module) error. This code often relates to a communication issue between the PCM and the Injector Driver Module (IDM). The IDM is crucial for controlling the fuel injectors in your Powerstroke engine, and a problem here could affect the engine’s performance.
While this code usually points to issues related to engine performance and injector control, it might be tied to your current transmission problems as well if the PCM isn't properly managing all systems.
Potential Causes of Transmission Not Engaging in Drive:
Here are a few possibilities that could explain why your truck isn’t engaging in drive after you’ve replaced the torque converter, along with the P1670 code.
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Transmission Fluid Level or Condition:
- Check the fluid level: Ensure you have the correct transmission fluid level. Low or dirty fluid can prevent the transmission from engaging.
- Fluid condition: If the fluid is burned or contains debris, it could indicate internal damage in the transmission.
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Torque Converter Issue:
- Although you've replaced the torque converter, there’s a chance the new torque converter may not be seated properly or might be defective. This could explain why it initially didn’t engage until you shifted into 4WD and did the gas/brake combination.
- Pump failure: If the front pump (which the torque converter drives) isn’t working properly, the transmission may not be building enough pressure to engage the gears.
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Valve Body Problem:
- The valve body in the transmission controls fluid flow to the clutches and bands. If there's a problem here (such as a stuck valve), it could prevent the transmission from going into drive.
- This might also explain the inconsistent behavior where the transmission sometimes engages and sometimes doesn't.
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Solenoid or Electrical Issue:
- If the transmission control solenoids are not functioning correctly, they may not be commanding the proper gear. Sometimes, even without a DTC, electrical faults in the solenoids or wiring can prevent the transmission from working properly.
- Check the transmission wiring harness for damage or loose connections. Ensure all grounds are clean and secure, as the P1670 code suggests potential electrical communication issues.
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PCM/IDM Communication Issue (Related to P1670):
- Since the P1670 code indicates a communication failure between the PCM and IDM, this could be affecting how the transmission is being controlled. A faulty IDM or bad ground connection to the PCM could be part of the issue.
- Check the IDM connections: Inspect the harness between the PCM and IDM for corrosion or damage. Also, ensure the IDM itself isn’t failing.
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Internal Transmission Failure:
- If none of the above check out, it’s possible the transmission has internal damage such as a broken band, damaged clutches, or even a failed planetary gearset. A complete rebuild might be necessary if there’s significant internal wear.
Diagnostic Steps to Follow:
- Check transmission fluid: Ensure it’s at the correct level, and inspect for signs of contamination.
- Inspect electrical connections: Pay special attention to the wiring between the PCM, IDM, and the transmission.
- Inspect the torque converter installation: Verify the new torque converter is seated correctly, and inspect for any damage or failure of the front pump.
- Run a transmission pressure test: This will confirm if the transmission is building the correct pressure.
- Inspect the valve body: Check for any stuck valves or damage.
- Test the IDM and PCM communication: Use a scan tool to ensure there’s proper communication between the IDM and PCM.
Recommended Repairs Based on the Issue:
- Correct the fluid level: If fluid is low or dirty, correct it, and see if it resolves the issue.
- Inspect/replace IDM: If there’s a communication error (P1670), testing the IDM and repairing its wiring or replacing it may be necessary.
- Reinspect the torque converter installation: Ensure it was installed properly, and inspect for any damage.
- Valve body service: If internal valves are sticking, cleaning or rebuilding the valve body could resolve the issue.
- Rebuild transmission: As a last resort, a full transmission rebuild may be necessary if there’s internal mechanical failure.
This diagnostic sequence should help you narrow down the issue. Let me know if you need further clarification or help with specific steps!
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