Faulty ignition coil or ignition module serving cylinder 6; Open circuit, short or poor connection in the cylinder 6 ignition control wiring between the module and coil; Corroded, loose or damaged ignition coil or control module connector terminals; Missing or unstable power supply or earth to the ignition coil or ignition module; Faulty crankshaft or camshaft position sensor signal preventing ignition enable; Fault inside the engine control module's ignition driver circuit.

P1366

IC Cylinder 6 Not Toggling After Enable.

Saturn
Powertrain
Manufacturer code
Medium severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
3: AreaIgnition system or misfire
66: FaultThe specific fault in that area

What it means

P1366 on a Saturn means the engine control module saw no switching (toggling) of the ignition control circuit for cylinder 6 after the ignition control system was enabled. The module expects the cylinder 6 ignition control signal to change state when the engine cranks or runs. When it did not, it set the code and treated cylinder 6 ignition as faulty. Only Saturn models with a six-cylinder engine and this ignition control layout will show it, so check the wiring diagram for the specific model.

Symptoms

Malfunction indicator lamp on
Engine misfire, rough running or shaking at idle
Loss of power, especially under load
Hard starting or extended cranking
Poor fuel economy
Flashing malfunction lamp if the misfire is severe

Possible causes

Faulty ignition coil or ignition module serving cylinder 6likely
Open circuit, short or poor connection in the cylinder 6 ignition control wiring between the module and coillikely
Corroded, loose or damaged ignition coil or control module connector terminalspossible
Missing or unstable power supply or earth to the ignition coil or ignition modulepossible
Faulty crankshaft or camshaft position sensor signal preventing ignition enablepossible
Fault inside the engine control module's ignition driver circuitrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine speed, load and temperature when the code set.
Check for other ignition, misfire or position sensor codes, as these point towards a shared supply or sensor problem.
Visually inspect the cylinder 6 coil or ignition module, its connector and the wiring for damage, chafing, heat damage, water or corrosion.
Check the cylinder 6 spark plug for wear, fouling or damage, and compare it with the other cylinders.
Swap the cylinder 6 coil or module with another cylinder, clear the code and see whether the fault follows the part.
Test the power and earth supplies at the coil or module connector with the ignition on, following the model wiring diagram.
Check the ignition control signal from the engine control module to cylinder 6 with a suitable meter or oscilloscope while cranking.
Test the wiring for continuity and for shorts to earth or voltage between the module connector and the coil connector.

How to fix

Replace the faulty cylinder 6 ignition coil or ignition module.
Repair or replace damaged wiring in the cylinder 6 ignition control circuit.
Clean or replace corroded or loose connector terminals and ensure they are fully seated.
Restore the correct power or earth supply to the ignition coil or module.
Replace a worn or damaged spark plug if it is contributing to the fault.
Replace a faulty position sensor if its signal is found to be missing or erratic.

Can I keep driving?

Medium severity

The car can be driven short distances if it runs acceptably, but get it fixed soon. A persistent misfire can overheat and damage the catalytic converter, so avoid heavy loads and stop driving if the warning lamp flashes.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.