I've owned a 2018 Civic Touring for about 5 years now. There's been a few minor issues, but I've run into a problem that seems to be eluding me. Last summer, I was pulling out of a parking lot when the engine just died. I tried to turn it back on, and it just sputtered and then died. The emission warning light went off, then every light went off. Brakes, steering, battery, engine, everything. I waited a minute or two, then tried the engine again, and it ran, but all the lights were on. After I got the car home, I left it overnight and when I tried to start it the next day, same things happened, only this time the engine didn't even start. It just sputtered and died. I tried to bring it to the dealer a few days later, and when I went to try it that day, the car started like nothing happened. No lights or anything. I took it into the dealer anyway, they took a look, said everything was fine, and sent me off. After that, the car did it one more time, but after which it started, and after driving for a bit the light turned off. I didn't have any more problems with it until a week ago.

Sunday I was out doing a bunch of errands when it broke down on me. Same issue. Same Symptoms. I ended up having to tow it home that day, and was going to make an appointment with the dealer the next morning, but again, it started like nothing happened, though it did still show all of the warning lights. again. So, this time I got an OBD reader online to check myself. It has been running intermittently all week. And I've noticed that sometimes when the engine won't start that the engine seems to shake very aggressively. I got the reader, and the only code that's being thrown is P0341. There was one time when it threw a "Cylinder 4 Misfire" It's been starting on and off the entire week, and so I've been driving it as much as I can without trying to push it too hard. There doesn't seem to be any discernable pattern to when it won't start. I'm not very experienced when it comes to cars. I know a little, but I'm by no means a mechanic. I've replaced the camshaft sensor itself, the battery, and all 4 of the spark plugs. None of which has worked so far. I don't want to take it into a mechanic again just to be sent away, but I'm reaching the limits of what I'm capable of. Hoping someone here has run into this kind of issue before, or has some sort of guidance.

 

Update, I tried to change the other camshaft sensor just to see if it would do anything, and now the car just won't start. I don't get any error codes or anything, just the battery and oil pressure lights. Really hoping someone has run into this before.

 

‐1. Turn the vehicle to the ON mode.
‐2. Clear the DTC with the HDS.
Clear DTC
‐3. Turn the vehicle to the OFF (LOCK) mode, and allow the engine to cool below 104 °F (40 °C).
‐4. Start the engine, and let it idle without load.
DTC Description Confirmed DTC Pending DTC P0341 CMP Sensor A and CKP Sensor Incorrect Phase Detected

‐5. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0341 indicated?



YES






NO






The failure is duplicated. Go to step 5.


Go to step 2.

‐1. Test VTC oil control solenoid valve A. 5. VTC oil control solenoid valve A operation check:
Is the solenoid valve OK?



YES






NO






Go to step 6.


Replace VTC oil control solenoid valve A.■

‐1. Check the camshaft timing. 6. Camshaft timing check:
Is the camshaft timing OK?



YES






NO






Go to step 7.


Reset the camshaft timing.■

‐1. Check for damage or stretch at the cam chain. 7. Cam chain check:
Is the cam chain damaged or stretched?



YES






NO






Replace the cam chain and the auto-tensioner.■


Go to step 8.

‐1. Inspect VTC actuator A. 8. VTC actuator A check:
Is the actuator OK?



YES






NO






Go to step 9.


Replace VTC actuator A.■

‐1. Turn the vehicle to the ON mode.
‐2. Reset the PCM with the HDS.
Reset PCM
‐3. Do the CKP pattern clear procedure.
CRANK PATTERN CLEAR
‐4. Do the PCM idle learn procedure.
‐5. Do the CKP pattern learn procedure.
CRANK PATTERN LEARNING
‐6. Turn the vehicle to the OFF (LOCK) mode, and allow the engine to cool below 104 °F (40 °C).
‐7. Start the engine, and let it idle without load.
DTC Description Confirmed DTC Pending DTC P0341 CMP Sensor A and CKP Sensor Incorrect Phase Detected

‐8. Check for Pending or Confirmed DTCs with the HDS. 9. PGM-FI system check (DTC check):
Is DTC P0341 indicated?



YES






NO






Check for poor connections or loose terminals at VTC oil control solenoid valve A and the PCM, then go to step 1.


Intermittent failure, the system is OK at this time. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.■


this is copied directly from our Honda troubleshooting guide. hope this helps