P0354 — Ignition Coil D Primary Control Circuit/Open

What Does P0354 Mean?

P0354 is a diagnostic trouble code indicating: Ignition Coil D Primary Control Circuit/Open. This code relates to the ignition system system. It has been reported in NHTSA complaints across 5 different vehicle models.

Engine misfires are detected by monitoring crankshaft rotational speed variations. Each cylinder's power stroke produces a characteristic acceleration pattern. When a cylinder fails to fire, the crankshaft decelerates during that cylinder's stroke. The ECM identifies which cylinder misfired and how often. P0313-P0399 codes cover extended misfire monitoring including lean misfire detection, knock-related ignition faults, and secondary ignition monitoring. A flashing check engine light during active misfires is an emergency — raw unburned fuel enters the catalytic converter, potentially destroying it.

Symptoms of P0354

⚠️ Check engine light on (may flash during active misfire)
⚠️ Engine misfiring — rough idle, stumbling, shaking
⚠️ Loss of power during acceleration
⚠️ Increased emissions and fuel consumption
⚠️ Catalytic converter damage if ignored
⚠️ Possible engine vibration at idle

Common Causes

🔍 Worn or fouled spark plugs
🔍 Faulty ignition coil
🔍 Vacuum leak causing lean misfire
🔍 Fuel injector issue (clogged, leaking, or electrical)
🔍 Low compression (worn rings, burned valve, head gasket)
🔍 Incorrect ignition timing

P0354 Reports by Year

2013

2

2017

1

2016

1

2018

1

2015

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"I OWN A 2009 COROLLA THAT HAS 108,000 MILES. I TOOK IT TO THE DEALER FOR THE AIRBAG RECALL FIX, AND IT ALSO HAD THE ENGINE CHECK LIGHT ON. THE DEALER SAID THAT THE OBD-II CODE P0354 CAME UP IN THE DIAGNOSTICS AND THE VEHICLE NEEDED A NEW ENGINE WIRE HARNESS AT A COST OF $2,000 DOLLARS. I DID MY OWN"
— Toyota Corolla owner, 12/01/2017

"WHILE DRIVING EAST ON I-490 FROM ROCHESTER TO I-90, THE CHECK ENGINE LIGHT CAME ON AND THE ENGINE WAS MISFIRING. WE EXITED THE FREEWAY AND THE CHECK ENGINE LIGHT STARTED TO FLASH, THE ENGINE SPUTTERED AND DIED. I PUT THE CAR IN NEUTRAL AND PARKED ON THE RIGHT CURB. FORTUNATELY THIS HAPPENED ON A CIT"
— Toyota Rav4 owner, 06/14/2016

"WHILE GOING ONTO A FREEWAY ONRAMP AT APPROXIMATELY 45 MILES PER HOUR, THE VEHICLE SUDDENLY LOST ALL POWER, ALL LIGHTS CAME ON, THE ABILITY TO STEER AND BRAKE WAS AFFECTED BY TOTAL POWER LOSS. THE VEHICLE DID NOT DISPLAY ANY ISSUES LEADING UP TO THIS BUT NEARLY RESULTED IN AN ACCIDENT BY THE INABILIT"
— Ford Escape owner, 08/30/2018

Source: NHTSA Complaints Database

Most Reported Vehicles for P0354

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	FORD ESCAPE
2	TOYOTA COROLLA
3	TOYOTA RAV4
4	FORD EDGE
5	HYUNDAI TUCSON

P0354 Reports by Vehicle

Detailed NHTSA complaint analysis for each vehicle model.

FORD ESCAPE

5 NHTSA reports · Peak: 2005, 2006

Diagnostic Tips

Check misfire counters in Mode 6 data — identifies which cylinder(s) are misfiring most
Swap ignition coil to another cylinder — if misfire follows, coil is bad
Check spark plugs — worn electrode, fouled with oil or carbon, cracked insulator all cause misfires
Perform compression test on affected cylinder(s) — low compression means mechanical issue

Common Mistakes to Avoid

❌ Replacing coils without checking spark plugs — a worn plug will kill a new coil
❌ Ignoring a flashing check engine light — this means severe misfire that's damaging the catalytic converter NOW
❌ Replacing ignition parts when the misfire is caused by a vacuum leak or low compression

Frequently Asked Questions

What does a flashing check engine light mean?

A flashing CEL means severe, active misfire that risks catalytic converter damage. Pull over safely and reduce engine load. Do not rev the engine. Drive gently to a repair facility or have it towed. This is the only CEL condition that warrants immediate action.

Can misfires damage my engine?

Misfires themselves don't usually damage the engine, but they can destroy the catalytic converter ($1000-$3000). Severe misfires also dilute engine oil with raw fuel, reducing lubrication. Extended misfires should always be repaired promptly.

Why does my car misfire only when cold?

Cold misfires are often caused by slightly worn spark plugs (gap too wide for cold, dense air-fuel mixture), marginal ignition coils that work fine once warm, or small vacuum leaks that are more noticeable at cold idle RPM.

Reported Repair Costs for P0354

Based on 9 owner-reported repair costs from NHTSA complaints.

Low End

$270

Typical

$1100

High End

$2700

⚠️ These are owner-reported costs, not estimates. Actual costs vary by location, labor rates, and root cause. Source: NHTSA complaints database.

What To Do Next

Possible Fixes

🔧 Replace spark plugs
🔧 Replace ignition coil(s)
🔧 Repair vacuum leak
🔧 Clean or replace fuel injector
🔧 Engine mechanical repair (valves, rings, gasket)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0354: Ignition Coil D Primary Control Circuit/Open