What Does P1241 Mean?
DTC P1241 indicates an open circuit in the fuel injector circuit for cylinder 5. The PCM detects no current flow through the cylinder 5 injector when it commands injection, meaning fuel is not being delivered to this cylinder. This results in a complete misfire on cylinder 5 with associated rough running and power loss.
Safety Warning
A non-functioning cylinder 5 injector creates a dead misfire, causing rough running, vibration, power loss, and potential catalytic converter damage from oxygen-rich exhaust. The vehicle should be repaired promptly.
Common Causes
30%
Loose or disconnected injector connector on cylinder 5
25%
Broken or heat-damaged wire in the cylinder 5 injector harness
25%
Fuel injector with internally open coil winding
10%
Corroded or backed-out pins in the injector connector
10%
PCM injector driver output failure for cylinder 5
Diagnostic Steps
1
Inspect the cylinder 5 injector connector for proper seating, lock tab engagement, and pin condition — disconnect and inspect for corrosion or terminal damage.
2
Measure injector coil resistance across the cylinder 5 injector terminals — should read 11-18 ohms; an open-circuit reading indicates a failed injector.
3
Check harness continuity from the PCM injector driver pin to the cylinder 5 injector connector for both wires — repair any open circuits found.
4
Install a noid light on the cylinder 5 injector harness connector to verify the PCM is generating injector pulses for this cylinder.
5
If the injector and harness test good, perform an injector swap test between cylinder 5 and an adjacent known-good cylinder to confirm results.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
DTC P1241 indicates an open circuit in the fuel injector circuit for cylinder 5. The PCM detects no current flow through the cylinder 5 injector when it commands injection, meaning fuel is not being delivered to this cylinder. This results in a complete misfire on cylinder 5 with associated rough ru...
The most common cause of P1241 (Injector Circuit Open Cylinder 5) is: Loose or disconnected injector connector on cylinder 5
Typical repair costs for P1241 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A non-functioning cylinder 5 injector creates a dead misfire, causing rough running, vibration, power loss, and potential catalytic converter damage from oxygen-rich exhaust. The vehicle should be repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1241 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection
Difficulty
Type
Manufacturer
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