P0354: Ignition coil D circuit fault
The ECU has found an electrical fault in ignition coil D or its wiring. The cylinder it feeds may stop firing, making the engine shake.
| Code | P0354 |
|---|---|
| System | Engine and transmission |
| Group | P03xx, Ignition and misfires |
| Type | Generic: it means the same on every make |
| Can you keep driving? | With care |
What P0354 means
Each coil turns the battery’s 12 volts into the high voltage that makes the spark plug fire. The primary circuit is the low voltage side controlled by the ECU; the secondary is the high voltage side that goes to the plug. This code points to a fault in either one on coil D, which usually serves cylinder 4, although the exact layout is set by each manufacturer.
Most common causes
- Loose, dirty or corroded coil connector
- Broken or chafed coil control or supply wire
- Failed coil (crack, moisture or internal fault)
- Worn spark plug or damaged boot overloading the coil
- Faulty ignition module or ECU driver stage
Symptoms
- Engine shaking or juddering, especially at idle
- Noticeable loss of power
- Engine warning light on or flashing
- Higher fuel consumption and a smell of unburnt petrol
Can you drive with P0354?
With care You can drive gently to a garage, but if the warning light flashes or the engine shakes badly, stop driving: unburnt fuel can damage the catalytic converter.
Open the bonnetthe in-depth explanation
How to check it
With a scan tool, watch the live misfire counters per cylinder: if cylinder 4 is building up misfires and the others are not, suspicion falls on that coil, its plug or its wiring.
How to read and clear P0354 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P0354 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P0350 The primary or secondary circuit of the ignition coil has a fault
- P0351 Ignition coil A circuit fault
- P0352 Ignition coil B circuit fault
- P0353 Ignition coil C circuit fault
- P0355 Ignition coil E circuit fault
- P0356 Ignition coil F circuit fault
- P0357 The primary or secondary circuit of ignition coil G has a fault
- P0358 The primary or secondary circuit of ignition coil H has a fault
- P0300 Random or multiple cylinder misfire
- P0301 Misfire detected in cylinder 1
- P0302 Misfire detected in cylinder 2
- P0303 Misfire detected in cylinder 3
What does code P0354 mean?
Each coil turns the battery’s 12 volts into the high voltage that makes the spark plug fire. The primary circuit is the low voltage side controlled by the ECU; the secondary is the high voltage side that goes to the plug. This code points to a fault in either one on coil D, which usually serves cylinder 4, although the exact layout is set by each manufacturer.
Can you drive with P0354?
You can drive gently to a garage, but if the warning light flashes or the engine shakes badly, stop driving: unburnt fuel can damage the catalytic converter.
How do you clear P0354?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P0354 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
