P0340
Camshaft Position Sensor Circuit Malfunction (Bank 1)
Description
Camshaft Position Sensor Circuit Malfunction (Bank 1). This powertrain diagnostic trouble code covers the engine, the fuel and ignition systems, emission control and the transmission.
OBD Codes Details
Possible Causes
Worn spark plugs, failed ignition coil, faulty injector, low compression in a cylinder
Solution
Read misfire counters per cylinder, inspect plugs and coils, swap the coil and injector to a neighbouring cylinder, run a compression test
Symptoms
- Engine cranks but is hard to start or fails to start
- Check engine light illuminated
- Rough idle or engine misfiring
- Reduced power and poor acceleration
- Engine stalling
Diagnostic Recommendations
- Inspect camshaft position sensor wiring and connector
- Test sensor output signal with a scan tool or oscilloscope
- Check timing chain/belt and camshaft phasing for correct alignment
- Inspect sensor mounting and air gap
- Replace camshaft position sensor if signal is absent or erratic
Repair Cost Estimate
- Camshaft position sensor replacement: $100-300
- Wiring repair: $80-200
- Timing chain/belt inspection and repair: $300-1200
- Diagnostic scan: $80-150
- Total diagnostic and repair: $150-1500
Was this helpful?
Loading...
Send Feedback
Found an error or have a suggestion? We respond within 48 hours.
Fact-checking completed
Verified by:
Pavel Volkov
Created:
Information verified against official sources
Official Sources
Society of Automotive Engineers
Official OBD-II diagnostic trouble codes standard (SAE J2012)
Automotive engineering standards organization
International Organization for Standardization
International standard for vehicle diagnostic systems
International standards for automotive diagnostics
Learn More
Dive deeper with our comprehensive developer guides for OBD Codes
Related Codes
More codes of the same type