P0354
Ignition Coil D Primary Control Circuit/Open
Ignition / misfire
Generic OBD-II
High
What it means
P0354 means the ECM has detected an open or fault in the primary control circuit for ignition coil D, so that coil isn't firing its spark plug reliably. The affected cylinder misfires, making the engine run rough and lose power. It's usually a failed coil or a wiring/connector fault, and sustained misfiring can damage the catalytic converter, so it's worth addressing promptly.
High
Can I keep driving? Drivable but rough — with ignition coil D not firing its cylinder, the engine misfires and loses power. Keep driving to a minimum to protect the catalytic converter.
Common symptoms
What you'll notice
- Check-engine light on (may flash during an active misfire)
- Rough idle, stumbling, or hesitation
- Noticeable loss of power
- Engine may run on fewer cylinders
Common causes
Most likely first
- Failed ignition coil DLikely
- Open or shorted coil primary control wiringCommon
- Corroded or loose connector at the coilCommon
- Failed ignition driver in the engine control module (rare)Less often
How to diagnose & fix
Work through it in order
- Confirm which cylinder coil D serves, then check for an accompanying misfire code.
- Inspect the coil connector and primary control wiring for an open, short, or corrosion.
- Swap coil D with a neighbouring coil; if the fault follows the coil, replace it.
- Measure the coil primary against spec and verify the ECM drive signal, then repair or replace. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0354?+
Only briefly. A dead coil causes a misfire that sends raw fuel into the exhaust and can overheat the catalytic converter — worse if the light is flashing.
Can I just clear P0354?+
It'll return quickly — an open coil primary circuit is re-detected as soon as the ECM tries to fire that coil.
Related codes
Often seen with P0354
Read & clear P0354 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX