What Does P0612 Mean?
P0612 indicates a malfunction in the fuel injector control module (FICM) relay control circuit. The ECM/PCM monitors the relay that supplies power to the FICM, and this code sets when there is an electrical fault in that relay's control circuit. Without proper relay operation, the FICM may not receive power to drive the fuel injectors. The driver may experience a no-start condition, hard starting, or sudden engine stalling.
Safety Warning
The vehicle may not start or may stall while driving if the FICM loses power. If the engine does run, it could stall without warning in traffic. If the relay is stuck on, the FICM may remain powered with key off, causing a parasitic drain. Have this repaired before driving.
Common Causes
30%
Failed FICM relay — internal coil open, welded contacts, or corroded contacts
25%
Wiring fault in the relay control circuit — open, short to ground, or short to power
20%
ECM/PCM internal relay driver circuit failure
15%
Corroded relay socket or fuse box connections
10%
Blown FICM power supply fuse
Diagnostic Steps
1
Locate the FICM relay in the fuse box (consult the vehicle's fuse/relay diagram). Remove the relay and check for a blown FICM fuse. Replace if blown, then investigate the cause of the overcurrent.
2
Test the FICM relay: apply 12V to the coil pins and verify the contacts close (you should hear a click and measure near 0 ohms across the contact pins). Also check coil resistance — typically 50-100 ohms.
3
With the relay removed, check for 12V on the relay socket's battery pin (should be hot at all times) and verify the ECM is providing a ground signal on the relay control pin by measuring voltage with key on — it should toggle between 0V (relay commanded on) and 12V (relay off).
4
If the ECM is not providing a control signal, check the wiring from the relay socket control pin to the ECM for continuity (below 5 ohms) and shorts. Repair any wiring faults.
5
If wiring is good but the ECM does not control the relay, the ECM's internal relay driver has failed. Verify by commanding the relay on/off with a scan tool if bi-directional control is available.
Estimated Repair Cost
$50 - $800
Parts + labor, varies by vehicle and location
P0612 indicates a malfunction in the fuel injector control module (FICM) relay control circuit. The ECM/PCM monitors the relay that supplies power to the FICM, and this code sets when there is an electrical fault in that relay's control circuit. Without proper relay operation, the FICM may not recei...
The most common cause of P0612 (Fuel Injector Control Module Relay Control Circuit) is: Failed FICM relay — internal coil open, welded contacts, or corroded contacts
Typical repair costs for P0612 range from $50 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle may not start or may stall while driving if the FICM loses power. If the engine does run, it could stall without warning in traffic. If the relay is stuck on, the FICM may remain powered with key off, causing a parasitic drain. Have this repaired before driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0612 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
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