P0355 OBD-II Trouble Code: Ignition Coil B Primary/Secondary Circuit Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0355 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0355 code

P0355 is a diagnostic trouble code (DTC) for "Ignition Coil B Primary/Secondary Circuit Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0355 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light

P0355 code definition

When the PCM (powertrain control module) identifies an electrical malfunction in ignition coil B’s primary or secondary circuit, it will set code P0355 to indicate the problem. The Check Engine Light will then illuminate.

What the P0355 code means

The engine’s ignition coils’ job is to ignite the air/fuel mix in each of the engine’s combustion chambers. When one of these ignition coils (in this case, coil B) has an electrical problem, the engine will not be able to run smoothly, and it may hesitate or misfire.

What causes the P0355 code?

The most common causes of the P0355 code include:

  • A defect or fault in ignition coil B
  • One or more defective spark plugs
  • An open or shorted circuit in the ignition coil
  • A poor connection to the ignition coil
  • Built-up carbon in the engine’s air passageways or the throttle body
  • A faulty electronic body or idle air control valve

What are the symptoms of the P0355 code?

There may be a number of symptoms associated with a P0355 code, including:

  • The Check Engine Light will come on
  • The engine will lose power or present a general lack of power when accelerating
  • The engine will hesitate when accelerating
  • The engine’s idle will be noticeably rougher
  • The vehicle will be difficult to start

How does a mechanic diagnose the P0355 code?

After identifying the P0355 code and any other stored codes from the PCM, using an OBD-II scanner, the mechanic will start by visually inspecting the wiring and circuits connected to ignition coil B. They will then pay close attention to the crank signal, as a problem here can cause numerous other issues, including a P0355 code.

After testing any repairs up to this point, they will switch the coil and its spark plug with the coil and spark plug from a good cylinder. Then they’ll clear the code and go for a test drive. If the PCM records a code for the ignition coil in the new cylinder, the mechanic will know that the problem is either with the spark plug or the coil and will test each to see where the issue is originating from. Then they’ll take steps to resolve the code and retest it once more.

Common mistakes when diagnosing the P0355 code

Sometimes the problem may actually be a leaking vacuum, rather than an issue with the ignition coil and/or spark plug. Replacing these without thoroughly inspecting the system can lead to an ineffective repair.

How serious is the P0355 code?

This code can significantly affect the drivability of the vehicle. If it’s left unresolved, it may also result in further engine damage and more expensive repairs down the road.

What repairs can fix the P0355 code?

The most common repairs for a P0355 code are:

Additional comments for consideration regarding the P0355 code

It’s very important that you get your P0355 code resolved and cleared as soon as possible. This kind of problem may have a quick and inexpensive fix, but it can result in major engine problems and/or very dangerous situations in the future. And, if you do not get the problem resolved, the Check Engine Light will remain illuminated, and the vehicle will be ineligible to pass an OBD-II emissions test when you need to register it to drive legally in your state.

Need help with a P0355 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

P0355
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0355 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

4,004

Rating Summary
3,661
169
45
25
104
3,661
169
45
25
104
Fabrice

Fabrice

17 years of experience
108 reviews
Fabrice
17 years of experience
Fabrice was late. He didn't communicate that he was going to be late until after the scheduled time for our appt. Once he arrived he was professional and courteous.
2005 FORD FOCUS - CHECK ENGINE LIGHT IS ON - ORLANDO, FLORIDA
Kris

Kris

20 years of experience
3 reviews
Kris
20 years of experience
Kris was extremely friendly and a straight-shooter on what was wrong with my car. Very knowledgeable. All around a great experience.
2010 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - MILWAUKEE, WISCONSIN
Richard

Richard

18 years of experience
451 reviews
Richard
18 years of experience
Very smooth and friendly. Great person
2002 NISSAN PATHFINDER - CHECK ENGINE LIGHT IS ON - MARIETTA, GEORGIA
Chet

Chet

38 years of experience
393 reviews
Chet
38 years of experience
Very knowledgeable and always on time.
2003 VOLKSWAGEN BEETLE - CHECK ENGINE LIGHT IS ON - CHULA VISTA, CALIFORNIA

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222...
How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: My car takes a long time to start

Hi there. From the description you have provided, I don't believe a bad fuel rail sensor could cause the ECM (electronic control module)/PCM (powertrain control module) to set a P0335. The crankshaft position sensor could set the P0335 and cause...

Q: The car starts, but when I hit the gas the check engine light blinks & it feels like I don't get much power, sometimes smell gas.

Hello. A flashing Check Engine Light is an indicator that the computer has detected an issue with the vehicle's engine management system that could potentially cause harm to the emissions system. Continuing to drive with a flashing Check Engine...

Q: Q: Check engine light on

Hi there. Since the Check Engine Light is on then the computer needs to be scanned for codes first. I usually do this before going any further with it. This can be caused by any number of sensors on the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com