What does code P1366 mean?

Q: What does code P1366 mean?

Cylinder 4 Ignition Circuit Short To Ground. P1366 on a Volkswagen indicates that the engine control module (ECM) has detected a short to ground on the ignition coil circuit for cylinder 4. The ECM commands the coil to fire, but the circuit voltage stays near zero volts instead of showing the expected switching signal, so the cylinder may not receive a spark.

DTC codes / Volkswagen codes / P1366

P1366 · VolkswagenCylinder 4 Ignition Circuit Short To Ground

P1366 on a Volkswagen indicates that the engine control module (ECM) has detected a short to ground on the ignition coil circuit for cylinder 4. The ECM commands the coil to fire, but the circuit voltage stays near zero volts instead of showing the expected switching signal, so the cylinder may not receive a spark.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

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