What Does P1344 Mean?
P1344 indicates that the ignition coil power output stage 2 has a short circuit to battery positive (B+). The coil driver circuit for coil 2 is being held at or pulled toward battery voltage when it should be switching between high and low states. This prevents proper coil collapse and spark generation, causing a dead misfire on the cylinder served by coil 2.
Safety Warning
Short to B+ can cause coil overheating and presents a fire risk if left unaddressed. The affected cylinder will have a complete misfire, reducing vehicle power. Repair promptly.
Common Causes
30%
Wiring short to a battery-voltage source in the coil 2 control harness
28%
Ignition coil 2 internal failure creating a short to the B+ supply pin
18%
Cross-pinned or misaligned connector terminals at coil 2
14%
ECU coil driver stage 2 transistor failure
10%
Aftermarket alarm or remote start wiring interfering with ignition circuit
Diagnostic Steps
1
Disconnect ignition coil 2 and measure voltage on the control line at the harness connector with key on. No voltage should be present on the ECU drive pin.
2
If voltage is detected, isolate the circuit by disconnecting the ECU connector and rechecking. Voltage still present means a harness short; no voltage means an ECU issue.
3
Trace the coil 2 control wire harness and look for locations where it may be pinched against or touching a power feed wire.
4
Check for aftermarket accessories (alarm, remote start, performance tuner) that may have been spliced into the ignition wiring.
5
Test ignition coil 2 for internal shorts by measuring resistance between the control terminal and the B+ supply terminal.
6
After repair, verify proper coil 2 switching waveform with an oscilloscope and confirm no misfires are present.
Estimated Repair Cost
$100 - $500
Parts + labor, varies by vehicle and location
P1344 indicates that the ignition coil power output stage 2 has a short circuit to battery positive (B+). The coil driver circuit for coil 2 is being held at or pulled toward battery voltage when it should be switching between high and low states. This prevents proper coil collapse and spark generat...
The most common cause of P1344 (Ignition Coil Power Output Stage 2 Short to B+) is: Wiring short to a battery-voltage source in the coil 2 control harness
Typical repair costs for P1344 range from $100 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Short to B+ can cause coil overheating and presents a fire risk if left unaddressed. The affected cylinder will have a complete misfire, reducing vehicle power. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1344 to identify the root cause.
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Powertrain
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Ignition System
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