What Does P1269 Mean?
The ECM has detected a high-to-low side short circuit in the cylinder #4 fuel injector driver circuit. This alternate manufacturer-specific code indicates the same condition as P1264 — an electrical short between the injector power supply wire and the ECM-controlled ground wire. The ECM loses proper control of fuel injection for cylinder #4, resulting in a misfire.
Safety Warning
A misfiring cylinder #4 causes rough running, reduced power, and potential catalytic converter damage. Extended driving with this condition stresses the remaining cylinders and risks damaging the ECM's injector driver circuit.
Common Causes
35%
Harness damage with cylinder #4 injector high and low side wires making contact
30%
Cylinder #4 fuel injector internal coil short circuit
20%
Water damage or corrosion at the cylinder #4 injector connector
15%
ECM injector driver output failure for cylinder #4
Diagnostic Steps
1
Scan for P0304 (cylinder #4 misfire) and other injector codes to determine if the fault is isolated.
2
Disconnect the cylinder #4 injector connector and inspect both sides for corrosion, bent pins, moisture, or heat damage.
3
Measure the injector coil resistance against manufacturer specifications and check for any continuity between the terminals and the injector body (ground).
4
Test the harness wires for continuity between each other with the injector disconnected — any continuity confirms a wiring short that needs repair.
5
Swap the cylinder #4 injector with another cylinder, clear codes, and run the engine. If the code moves to the new cylinder, replace the injector. If it stays, repair the wiring or suspect the ECM.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
The ECM has detected a high-to-low side short circuit in the cylinder #4 fuel injector driver circuit. This alternate manufacturer-specific code indicates the same condition as P1264 — an electrical short between the injector power supply wire and the ECM-controlled ground wire. The ECM loses proper...
The most common cause of P1269 (Cylinder #4 High To Low Side Short) is: Harness damage with cylinder #4 injector high and low side wires making contact
Typical repair costs for P1269 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A misfiring cylinder #4 causes rough running, reduced power, and potential catalytic converter damage. Extended driving with this condition stresses the remaining cylinders and risks damaging the ECM's injector driver circuit.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1269 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection System
Difficulty
Type
Manufacturer
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