What Does P0262 Mean?
The ECM has detected that the cylinder 1 fuel injector circuit voltage is above the expected maximum threshold, indicating a high condition. This means the injector driver circuit is seeing excessive voltage, typically caused by a short to battery voltage in the injector wiring, a disconnected injector producing an open circuit, or an ECM driver issue.
Common Causes
35%
Open circuit in the cylinder 1 injector wiring or disconnected connector
25%
Short to battery voltage in the cylinder 1 injector control wire
25%
Failed cylinder 1 fuel injector with open coil winding
15%
ECM injector driver circuit fault causing high-side failure
Diagnostic Steps
1
Step 1: Verify the cylinder 1 injector connector is fully seated and locked — a partially disconnected injector will cause a high circuit reading.
2
Step 2: Measure the injector coil resistance — an open reading (OL/infinity) confirms an internally failed injector coil. Normal spec is 11-18 ohms for most high-impedance injectors.
3
Step 3: With the injector disconnected, check the control wire for shorts to battery voltage — measure from the control pin to battery positive (should be open).
4
Step 4: Inspect the wiring harness for damage where it routes near power distribution components or battery cables.
5
Step 5: Swap the cylinder 1 injector with an adjacent cylinder to confirm whether the fault follows the injector or stays with the wiring position.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The ECM has detected that the cylinder 1 fuel injector circuit voltage is above the expected maximum threshold, indicating a high condition. This means the injector driver circuit is seeing excessive voltage, typically caused by a short to battery voltage in the injector wiring, a disconnected injec...
The most common cause of P0262 (Cylinder 1 Injector Circuit High) is: Open circuit in the cylinder 1 injector wiring or disconnected connector
Typical repair costs for P0262 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will run rough on one fewer cylinder. Drivable for short distances but continued operation can cause catalytic converter damage from unburned fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0262 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Generic (SAE)
Recommended Tools
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