Q: P0201 and p0301 code with new injector, coil, sparkplugs and wires and replaced ecm

asked by on

I recently replaced ecm, spark plugs, wires, coil, new injector and it still is misfiring with check engine light and p0201 and p301 codes... I need to smog my van and dont know what could be causing this
My car has an automatic transmission.

Hi there. As you already know, replacing components without diagnoses can be expensive and time consuming without resolution. Circuit testing for the P0201 (#1 cylinder injector circuit fault) code needs to be performed to isolate the injector circuit fault. This could be done using an DVOM (digital, volt , ohm, meter), checking for a voltage signal to the injector and a resistance value test from the injector to the ECM (engine control module). Resolving the P0201 code, more than likely, will resolve the P0301 (#1 cylinder misfire) code. I recommend having your vehicle’s check engine light be diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. P0201 and p0301 code with new injector, coil, sparkplugs and wires and replaced ecm

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Radiator empty but there is no leak from the radiator.

Hi there. Check the coolant hoses and heater hoses for any leaks. If there are no leaks, then check the core plugs (freeze plugs) on the engine for any leaks or signs of leaks. If there is no visible leak,...

Q: Battery light came on, overheated, coolant sprayed everywhere

The noise you were hearing may have been the serpentine belt breaking. Once the belt broke completely both the water pump and alternator stopped turning, thus accounting for both the overheating and the charging light coming on. It's possible you...

Q: Car shuts off when stepping on pedal

Hi There, A number of things may cause the car to shut off when stepping on the gas pedal such as a bad fuel pump, a vacuum leak, a clogged fuel filter or a dirty or faulty idle air control...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...