P0340 Ford F-150
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 Ford F-150 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 Ford F-150.
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 Ford F-150.
Common Causes on Ford F-150
- Failed camshaft position (CMP) sensor — common failure on Ford engines over 100k miles
- Wiring or connector damage at the CMP sensor
- Timing chain stretch causing signal correlation issues
- Oil contamination in CMP sensor connector
Symptoms
- Check engine light
- Hard starting or extended crank time
- Intermittent stalling
- Rough idle
- Possible no-start condition
Notes for Ford F-150
On the 5.0L Coyote, a P0340 alongside cam phaser codes (P0010-P0014) usually indicates a timing chain or phaser issue, not just a sensor failure.