P0353
Ignition Coil C Primary/Secondary Circuit
When a vehicle powertrain module registers the fault code P0353, it points directly to an internal system malfunction identified as "Ignition Coil C Primary/Secondary Circuit". Operating your engine under this condition may degrade long-term fuel maps.
Driver's Summary
Storing code P0353 is your car's way of telling you something is wrong with the ignition coil c primary/secondary circuit. In practice, this fault causes engine misfire, rough idle, lack of power on acceleration. Stop driving as soon as it is safe to do so. This fault can lead to expensive secondary damage if left unaddressed.
Symptoms
Engine misfire, rough idle, lack of power on acceleration
Common Causes
- Failed ignition coil C (Cylinder 3)
- Damaged wiring to coil C
- Bad spark plug
- Defective PCM coil driver
How to Fix
- 1 Replace ignition coil C
- 2 Repair broken or shorted wiring
- 3 Replace spark plug
- 4 Test PCM output signal
Technical Explanation
The ECM detects code P0353 by continuously monitoring the relevant sensor circuit against calibrated threshold values stored in its non-volatile memory. The PCM monitors crankshaft rotational velocity via the CKP sensor at a resolution of individual tooth gaps on the reluctor ring. A combustion event in each cylinder produces a measurable acceleration spike; its absence or weakness is flagged as a misfire event within a 200-revolution or 1000-revolution test window. The MIL illuminates after the fault is confirmed on two consecutive drive cycles, and the freeze frame data captured at first detection is stored in the PCM's memory for diagnostic reference.
Is It Safe to Drive?
This fault carries real mechanical risk. The root causes — including failed ignition coil c (cylinder 3) — can trigger a chain reaction of component failures if the vehicle continues to be driven. Have it towed or drive directly to a shop without delay.
Mechanic's Pro Tip
The fastest isolation technique for P0353 is the coil swap test: move the ignition coil from the affected cylinder to a neighboring cylinder and clear the code. If the misfire follows the coil, it's the coil. If it stays on the same cylinder, focus on the spark plug, injector, or compression. Never replace coils without also replacing the spark plug in that cylinder — a fouled plug will kill a new coil within weeks.
Ignition coil: $80 - $200