What Does P1670 Mean?
The PCM is not receiving expected electronic feedback signals from a controlled component or system. This indicates a loss of communication or confirmation signal from an output device.
Common Causes
30%
Open circuit or break in feedback signal wiring harness
25%
Faulty sensor or actuator not providing feedback signal to PCM
20%
Poor ground connection or corroded ground circuit affecting feedback path
15%
Defective control module or relay not generating feedback signal
10%
PCM internal input circuit failure preventing feedback signal reception
Diagnostic Steps
1
Step 1: Identify specific feedback circuit using factory wiring diagrams and scan tool data
2
Step 2: Check continuity of feedback signal wire from component to PCM with all connectors attached
3
Step 3: Verify ground circuits are intact and measure voltage drop on ground paths under load
4
Step 4: Use scan tool to monitor live data and command output device on/off while watching for feedback response
5
Step 5: Backprobe feedback signal wire at PCM connector with multimeter to verify signal presence during operation
Estimated Repair Cost
$120 - $900
Parts + labor, varies by vehicle and location
The PCM is not receiving expected electronic feedback signals from a controlled component or system. This indicates a loss of communication or confirmation signal from an output device.
The most common cause of P1670 (Electronic Feedback Signal Not Detected) is: Open circuit or break in feedback signal wiring harness
Typical repair costs for P1670 range from $120 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May result in reduced system functionality or limp mode operation. Generally safe to drive short distances but may affect driveability or emissions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1670 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Control System
Difficulty
Type
Manufacturer
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