What this code means
P0344 can indicate an intermittent interruption in the camshaft position sensor A signal circuit.
What the vehicle may do
- The engine may run rough, stall, or be hard to start.
- The warning light may appear intermittently.
- The condition can be difficult to duplicate if it only occurs under certain operating conditions.
Possible fault areas
- Possible connector or terminal issues at the camshaft position sensor A or PCM.
- Possible engine ground or body ground connection issue.
- Possible cam pulse plate looseness or damage.
- Possible camshaft position sensor A fault.
Diagnostic path
Opening context
On this 2016-2024 Honda Civic with the L4-2.0L (K20C2) engine, P0344 means the PCM is seeing an intermittent interruption from CMP sensor A. In plain language, the cam sensor signal may be dropping out when the PCM expects a clean pulse pattern. The vehicle may run rough, stall, be hard to start, or it may only turn the light on intermittently. The broad possible fault areas are sensor circuit connections, loose terminals, grounds, the cam pulse plate, or the sensor itself. Before going after P0344, start with the basic troubleshooting approach. The goal is to duplicate the fault first, then work through the physical checks in order instead of guessing.
Reproduce the first operating condition
Start by reproducing the first operating condition. Start the engine and let it idle for 10 seconds or more. While it is idling, watch the HDS OBD status in PGM-FI for P0344. If the failure shows up here, the confirmation part of the check has done its job and you can move into the circuit and component inspections.
Reproduce the captured driving condition
If the idle check does not bring it back, move to the second operating condition. Test-drive the vehicle for several minutes in the same range as the recorded on-board snapshot for Engine Speed and Vehicle Speed. Then monitor the HDS OBD status in PGM-FI again for P0344. This keeps the diagnosis tied to the conditions where the PCM saw the intermittent cam signal problem.
Check the CMP sensor A circuit connections
Once the fault has been approached through the confirmation checks, inspect the CMP sensor A circuit connectors. Check for a secure connection and for loose terminals at CMP sensor A and at the PCM. If this inspection is abnormal, treat it as a connection or terminal problem in that part of the circuit before moving deeper.
Check the ground-side terminals
Next, check the related terminal condition at the engine ground and body ground. Again, you are looking for secure connections and loose terminals. If this inspection is abnormal, the diagnostic path points to a connection or terminal problem at those grounds.
Inspect CMP pulse plate A
If the connector and ground checks are OK, remove the cylinder head cover so CMP pulse plate A can be visually inspected. Look for looseness or damage. If the pulse plate inspection is abnormal, the problem is with CMP pulse plate A.
Final diagnostic call
If the earlier inspection items all show normal conditions, the remaining call in this path is a problem with CMP sensor A. Do not jump there first. For an intermittent P0344, the logic is to duplicate the operating condition, check the connectors and grounds, inspect the pulse plate, and only then make the sensor call if everything else checks normal. The takeaway: stay in order, prove the fault path, and avoid turning an intermittent signal code into a parts guess. For more diagnostic training, visit stepdiagnostics.com.
Final check
This code is often best handled by duplicating the operating condition first, then checking the circuit connections, grounds, pulse plate, and sensor path in order.
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