What Does P0212 Mean?
This code indicates a malfunction in the fuel injector circuit for cylinder 12. The ECM has detected an electrical fault in the cylinder 12 injector driver circuit. This code is specific to V12 engine configurations. Cylinder 12 is not receiving proper fuel injection pulses, causing a misfire on that cylinder.
Common Causes
35%
Failed cylinder 12 fuel injector with internal coil open or short
30%
Corroded or damaged wiring at the cylinder 12 injector connector in the rear of the engine
20%
ECM injector driver circuit failure for the cylinder 12 output channel
15%
Power supply fault in the injector harness feed circuit affecting the cylinder 12 bank
Diagnostic Steps
1
Step 1: Disconnect and measure cylinder 12 injector coil resistance. Compare to specification.
2
Step 2: Verify 12V power supply at the injector connector with key on.
3
Step 3: Use a noid light to confirm ECM pulse signal at the cylinder 12 connector during cranking.
4
Step 4: If accessible, swap the cylinder 12 injector with an adjacent cylinder to determine if the fault follows the component.
5
Step 5: Trace wiring from the cylinder 12 connector back to the ECM, inspecting for damage in hard-to-reach rear engine areas.
Estimated Repair Cost
$250 - $950
Parts + labor, varies by vehicle and location
This code indicates a malfunction in the fuel injector circuit for cylinder 12. The ECM has detected an electrical fault in the cylinder 12 injector driver circuit. This code is specific to V12 engine configurations. Cylinder 12 is not receiving proper fuel injection pulses, causing a misfire on tha...
The most common cause of P0212 (Injector Circuit Malfunction - Cylinder 12) is: Failed cylinder 12 fuel injector with internal coil open or short
Typical repair costs for P0212 range from $250 to $950, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A cylinder 12 misfire dumps raw fuel into the exhaust, risking catalytic converter overheating and damage. The misfire may be less noticeable on a 12-cylinder engine but still causes emissions violations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0212 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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