P0340 Honda Accord
Camshaft Position Sensor Circuit Malfunction (Bank 1) · Powertrain Code · High · Repair: Moderate
What is P0340?
The camshaft position sensor on bank 1 is not providing a valid signal. Engine may not start or run poorly.
When the Honda Accord triggers code P0340 (camshaft position sensor circuit malfunction (bank 1)), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Honda Accord.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Honda Accord.
Common Causes on Honda Accord
- Failed camshaft position sensor (CMP)
- Damaged CMP sensor connector or wiring
- Stretched timing chain causing erratic cam signal
- Failed VTC actuator affecting cam position signal
Symptoms
- Check Engine Light on
- Hard starting or extended cranking
- Rough idle and possible stalling
- Reduced engine power
- Possible no-start condition
Notes for Honda Accord
On high-mileage K24 engines, always check timing chain stretch when diagnosing CMP codes — a stretched chain gives erratic cam signals that mimic sensor failure.