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DTC codes / Volkswagen codes / P1349

P1349 · VolkswagenIgnition Coil Power Output Stage 2 Open

P1349 on Volkswagen vehicles indicates that the engine control module has detected an open circuit in the power output stage for ignition coil 2, which is the final transistor inside the ECM that switches ground to the coil primary. The ECM commands the coil to fire but sees no expected current flow or voltage feedback on that channel, so it flags the circuit as open and may disable that cylinder's ignition to protect the catalytic converter.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illuminated check engine light, often with no other noticeable symptoms at first
  • Rough idle or misfire felt as a shake or stumble, especially when cold
  • Loss of power and reduced fuel economy because one cylinder is not firing
  • Flashing check engine light under load if the misfire is severe enough to risk converter damage
  • Slight hesitation or surge during acceleration as the ECM compensates for the dead cylinder
  • A distinct exhaust note or smell of unburned fuel from the affected cylinder

Common causes, most likely first

  1. Open or damaged wiring between the ECM output stage and ignition coil 2, including chafed harness insulation or a broken connector pin
  2. Failed ignition coil 2 with an open primary winding, which presents the same open-circuit condition to the ECM
  3. Corroded or loose electrical connector at coil 2 or at the ECM harness, interrupting the switching signal
  4. Failed output stage transistor inside the ECM for coil 2, which is a known failure mode on some Volkswagen engine management units
  5. Blown fuse or relay supplying power to the ignition coil circuit, though this usually affects more than one coil
  6. Poor engine ground strap or ground connection that raises resistance in the coil primary circuit

How to diagnose and fix it

  1. Scan all modules and record freeze-frame data for P1349, then clear the code and verify whether it returns immediately or only after a drive cycle
  2. Inspect the ignition coil 2 connector and harness for corrosion, pushed-back pins, or chafed wiring, and perform a wiggle test while watching live misfire counters
  3. Swap ignition coil 2 with a known-good coil from another cylinder and see whether the fault follows the coil or stays with the cylinder 2 circuit
  4. Measure resistance of the coil 2 primary winding and compare it to the other coils, then check for battery voltage at the coil connector with the key on
  5. Back-probe the ECM output stage signal wire for coil 2 and check for a clean switching pulse with a lab scope or LED test light while cranking
  6. Check continuity and resistance of the ground circuit from the coil 2 connector back to the engine block and battery negative
  7. If wiring and coil test good but the ECM output stage shows no switching signal, diagnose the ECM internal driver and replace or repair the ECM as needed

What the output stage code really means

  • P1349 is often set by a failed ignition coil rather than a failed ECM, so swapping the coil to another cylinder before condemning the computer saves unnecessary ECM replacement.
  • A coil that tests good on a resistance check can still cause this code intermittently when heat or vibration opens the primary circuit, so a road test with live misfire data is more reliable than a bench test.
  • Volkswagen ECM output stages for individual coils can fail after long-term heat cycling, and a shorted coil primary is a common root cause that takes out the driver transistor when it fails.
  • This code does not always mean the engine is misfiring badly; the ECM may set it as soon as it detects an open circuit during a self-test, even before the driver feels a symptom.
  • A poor engine ground or a weak battery can cause false open-circuit detection on coil circuits, so check ground straps and charging voltage before replacing expensive modules.

Can I keep driving with P1349?

You can drive cautiously to a repair shop if the check engine light is steady and the engine runs smoothly, but avoid hard acceleration and heavy loads. If the light flashes or the engine misfires badly, stop driving because unburned fuel can overheat and damage the catalytic converter.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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