P0351: Ignition Coil A Primary Control Circuit/Open
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Briefly - a dead coil means a dead cylinder dumping raw fuel into the exhaust; a flashing light means stop.
Symptoms
- Steady miss on one cylinder
- Flashing check engine light under load
- Strong fuel smell from exhaust
Likely causes, most common first
- Ignition coil primary circuit - coil A failed
- Coil connector or wiring
- Rarely the computer's coil driver
Read P0351 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P0351 means the computer commanded coil number one to fire and the circuit did not respond correctly - an electrical fault, distinct from misfire codes that infer problems from crank speed. Companion codes P0352-P0358 cover the remaining coils.
On coil-per-cylinder engines the swap test is definitive: move the suspect coil to another cylinder and see whether the code follows. Coils are commodity parts; wiring faults masquerading as coils are the trap this code helps avoid.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P0351
“Code P0351, P0352, P0353, P0354, P0355, P0356. Vehicle shut down on the interstate on the way home for work, 2½ hours from home. And will not restart. Pcm most likely the problem.”2006 Ford Escape · Aug 2021
“I purchased the car used with the understanding that it had some issues with a misfire. Upon initial inspection I fount the car was throwing the code p0351 I cleared all faults and problem went away weks went by and problem started again but more sever during normal operation the car started shaking and shifting erratic I then came upon some k formation as to a recall ford put in place stating improper calibration of pcm and tcm cause unnecessary interaction I the electrical system and malfunction of the vehicle”2005 Ford Five Hundred · Aug 2020 · 237,232 mi
“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 inability to control the vehicle and get it off to the side of the road. After being towed, the auto shop diagnosed a p0354, p0351, p0355, p0352 ignition coils, and pcm failure. My research shows there are multiple claims of this occurring and it is definitely a safety issue.”2005 Ford Escape · Aug 2018
Show 1 more owner reports
“Vehicle misfire and stall while driving caused by damaged power control module (pcu) and faulty/damaged ignition coil. Service bullitn issued: tsb 14-0059 mil on with dtcs - p0351, p0352, p0353, p0354, p0355, and/or p0356 - built on or before 3/1/2008 publication date: march 20, 2014”2007 Lincoln MKX · Dec 2015 · 72,000 mi
Cars that report P0351 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P0351?
Briefly - a dead coil means a dead cylinder dumping raw fuel into the exhaust; a flashing light means stop.
How much does it cost to fix P0351?
Typical US repair costs range from $80 for the simplest fix (ignition coil) to $400 in the worst case. The right number depends on which cause your car has - see the causes list.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.