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P1670 - Electronic Feedback Signal Not Detected

Possible causes
- 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)
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1670 Description

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. Additionally, the EF signal is used to send diagnostics of the IDM and injectors (electrical) to the PCM.

P1670 Information for specific makes
P1670 BUICK Quad Driver Module 'C' Fault Detected Conditions
P1670 CADILLAC Quad Driver Module 'C' Fault Detected Conditions
P1670 CHEVROLET Quad Driver Module 'C' Fault Detected Conditions
P1670 FORD Electronic Feedback Signal Not Detected
P1670 GMC Quad Driver Module 'C' Fault Detected Conditions
P1670 HYUNDAI Ignition Power Stage B Circuit Malfunction
P1670 LAND-ROVER Engine Control Module Cooling Fan Circuit Low
P1670 SAAB Throttle Actuator Limp Home Relay Open Circuit / Short To Ground
P1670 VOLVO Immobilizer Communication
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