P0340: Camshaft Position Sensor Circuit Malfunction
28 vehicles · 13 makes
P0340 is an OBD-II diagnostic trouble code meaning “Camshaft Position Sensor Circuit Malfunction.” The camshaft position sensor is not sending a valid signal to the ECU. Can cause rough running, misfires, or no-start. This code appears across 28 vehicle models from 13 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0340, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (28)
Camshaft Synchronizer Chirp and Oil Pump Drive Failure on 3.0L/4.0L V6
Timing Chain Cassette and Guide Failure on 4.0L SOHC V6
Timing Chain Guide and Cassette Failure on 4.0L SOHC V6
Distributor Failure (Mazda FS/KL Engine)
Timing Chain / VVEL Rattle and Front Timing Cover Oil Leaks on VQ37VHR
Camshaft / Crankshaft Position Sensor Failure
Camshaft and Crankshaft Position Sensor Failure
Camshaft and Crankshaft Position Sensor Failure
Camshaft / Crankshaft Position Sensor Failure
Timing Chain Guide Wear / Chain Noise
Timing Chain Guide Wear and Chain Noise
Intermittent Engine Stalling While Driving
Crankshaft and Camshaft Position Sensor Failures Causing Stalling or No-Start
Timing Chain Guide and Tensioner Wear
VQ35DE Timing Chain Stretch and Guide Wear
Distributor / Ignition System Failure Causing Sudden Stall or No-Start
Crankshaft and Camshaft Position Sensor Failure Causing Intermittent Stall or No-Start
CAS (Crank Angle Sensor) Failure
FAQ
What does P0340 mean?
P0340 stands for "Camshaft Position Sensor Circuit Malfunction." The camshaft position sensor is not sending a valid signal to the ECU. Can cause rough running, misfires, or no-start.
What are the most common causes of P0340?
The most common causes of P0340 are: Failed camshaft position sensor, Damaged wiring to sensor, Corroded connector, Timing chain jumped, ECU issue. The specific cause varies by vehicle.
How much does it cost to fix P0340?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0340?
Au7o has documented P0340 across 28 vehicle models from 13 manufacturers: Acura, BMW, Cadillac, Ford, GMC, Honda, Hyundai, Infiniti, Jeep, Kia, Mazda, Nissan, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.