What Does P1226 Mean?
P1226 indicates a short-to-ground condition in the fuel injector circuit for cylinder 2. The ECM detected that the control wire for the cylinder 2 injector has unwanted continuity to ground, which disrupts normal injector control. This can cause the injector to stay permanently energized, fail to fire, or draw excessive current that damages the ECM driver.
Common Causes
30%
Cylinder 2 injector harness wiring shorted to engine ground from chafing
25%
Internally shorted cylinder 2 fuel injector with coil-to-body ground fault
20%
Water or coolant contamination in the injector connector causing a ground path
15%
Heat-damaged insulation on the injector wiring near cylinder 2
10%
ECM injector driver failure creating an internal ground short on the output
Diagnostic Steps
1
Check for companion codes P0202 and P0302 to confirm the cylinder 2 correlation and review freeze frame data.
2
Disconnect the cylinder 2 injector connector and test for short to ground on both wires from the connector to the ECM using a multimeter.
3
With the harness disconnected at both ends, test the injector itself for shorts between its terminals and the injector body/ground.
4
Visually trace the cylinder 2 injector wiring harness for abrasion, pinch points, or melted insulation, especially near hot engine surfaces.
5
If the wiring and injector both test clear, back-probe the ECM injector driver pin to check if the ground short originates internally in the ECM.
6
Repair any damaged wiring, replace the injector if shorted internally, and clear codes. Verify repair by monitoring the injector circuit current with a scope.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
P1226 indicates a short-to-ground condition in the fuel injector circuit for cylinder 2. The ECM detected that the control wire for the cylinder 2 injector has unwanted continuity to ground, which disrupts normal injector control. This can cause the injector to stay permanently energized, fail to fi...
The most common cause of P1226 (Injector Circuit Cylinder 2 Short To Ground) is: Cylinder 2 injector harness wiring shorted to engine ground from chafing
Typical repair costs for P1226 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A ground short on the injector circuit can cause cylinder 2 to flood or misfire, resulting in rough running, elevated emissions, and catalytic converter overheating. Excessive current draw can also damage the ECM injector driver permanently.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1226 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Manufacturer
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