What Does P1341 Mean?
P1341 indicates that the ignition coil power output stage 1 has a short circuit to ground. The output stage is the transistor driver within the ECU or ignition module that controls the primary circuit of ignition coil 1. A short to ground means the driver circuit or its wiring has an unintended path to chassis ground, preventing proper coil operation and causing a misfire on the affected cylinder.
Safety Warning
A shorted coil driver causes a persistent misfire on the affected cylinder, reducing power and potentially damaging the catalytic converter from unburned fuel. The short may also damage the ECU output stage if left unrepaired.
Common Causes
30%
Chafed or damaged wiring between ECU/ignition module and coil 1 shorting to ground
30%
Failed ignition coil 1 with internal short to ground
20%
Water intrusion in the coil connector causing ground path
12%
Damaged ECU ignition output driver transistor
8%
Coil mounting hardware creating unintended ground contact
Diagnostic Steps
1
Disconnect ignition coil 1 and clear the code. If the short-to-ground code does not return, the fault is in the coil itself.
2
With the coil disconnected, measure resistance from the coil control wire at the ECU connector to chassis ground. Any low resistance reading confirms a wiring short.
3
Inspect the coil 1 wiring harness for damaged insulation, especially where it passes near metal brackets, exhaust components, or sharp edges.
4
Check the coil connector for moisture, corrosion, or debris that could create a conductive path to ground.
5
Measure ignition coil 1 primary winding resistance and insulation resistance to the coil housing. Compare to specifications.
6
If the wiring is clean and the coil tests good, the ECU output stage driver may be damaged. Test by monitoring the drive signal with an oscilloscope.
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
P1341 indicates that the ignition coil power output stage 1 has a short circuit to ground. The output stage is the transistor driver within the ECU or ignition module that controls the primary circuit of ignition coil 1. A short to ground means the driver circuit or its wiring has an unintended path...
The most common cause of P1341 (Ignition Coil Power Output Stage 1 Short to Ground) is: Chafed or damaged wiring between ECU/ignition module and coil 1 shorting to ground
Typical repair costs for P1341 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A shorted coil driver causes a persistent misfire on the affected cylinder, reducing power and potentially damaging the catalytic converter from unburned fuel. The short may also damage the ECU output stage if left unrepaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1341 to identify the root cause.
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Ignition System
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