2019-2024 Nissan Altima Trouble Code P0340: Camshaft Position Sensor Circuit Malfunction
If your 2019-2024 Nissan Altima (2.5L Direct Injection I4 (PR25DD), 2.0L VC-Turbo Variable Compression (KR20DDET)) is triggering code P0340, accompanied by Extended 5–10 second cranking before starting, sudden lack of power above 3,000 RPM, inspect the primary mechanical failure points below. You can record your live engine sound to verify symptoms with Carithm's free neural acoustic engine.
🎙️ Free Nissan Altima Engine Sound Diagnoser
Neural Engine ReadyTip: Hold your smartphone microphone 12–18 inches above the valve cover or near the tailpipe while recording.
Vehicle-Specific Causes for 2019-2024 Nissan Altima
On the Nissan CMF-C/D Architecture Midsize Sedan equipped with the 2.5L Direct Injection I4 (PR25DD), 2.0L VC-Turbo Variable Compression (KR20DDET), our automotive repair database indicates the following primary root causes for P0340:
Documented Failure Pattern:
Crankshaft position sensor thermal intermittent drop-out (engine shuts off when warm) or CVT stepper motor code.
General Root Causes: Defective camshaft position sensor, loose sensor mounting bolt, oil contamination, or wiring harness break.
Quick DIY Verification Steps
Before scheduling an expensive workshop appointment, perform these basic diagnostic checks:
- Acoustic Isolation: Does the engine make Extended 5–10 second cranking before starting, sudden lack of power above 3,000 RPM? Note if the frequency doubles with engine RPM or remains constant.
- Targeted Physical Check: Remove camshaft sensor and inspect magnetic tip for iron sludge or metal debris from valvetrain.
- AI Audio Cross-Check: Use the free tool above to analyze your engine audio recording for mechanical harmonic abnormalities.
Estimated Repair Cost Benchmarks
Typical repair costs for resolving P0340 on a 2019-2024 Nissan Altima at certified independent repair shops:
| Diagnostic & Repair Tier | Estimated Parts | Estimated Labor |
|---|---|---|
| Minor (Sensor clean, hose, wiring repair) | $33 – $49 | $60 – $84 |
| Moderate (OEM Sensor, injector, coil pack) | $52 – $92 | $90 – $144 |
| Comprehensive (Timing, manifold, internal) | $165 – $322+ | $259 – $432+ |
*Cost estimates based on national US independent mechanic labor rates ($110–$160/hr). Dealership pricing may be 30–50% higher.
Frequently Asked Questions
What does code P0340 mean on a 2019-2024 Nissan Altima?
Code P0340 indicates Camshaft Position Sensor Circuit Malfunction. On the 2019-2024 Nissan Altima (2.5L Direct Injection I4 (PR25DD), 2.0L VC-Turbo Variable Compression (KR20DDET)), this fault is commonly triggered by: Crankshaft position sensor thermal intermittent drop-out (engine shuts off when warm) or CVT stepper motor code.
Is it safe to drive my 2019-2024 Nissan Altima with code P0340?
Severity Assessment: 🔴 High Risk (Long cranking time and limp mode). If your check engine light is flashing or accompanied by rough running, hesitation, or unusual mechanical knocking, discontinue driving immediately to avoid catalytic converter burnout or valvetrain destruction.
What engine sounds are associated with P0340 on 2019-2024 Nissan Altima?
Drivers frequently report: Extended 5–10 second cranking before starting, sudden lack of power above 3,000 RPM. Listening closely to your engine audio helps verify whether the root failure is an electrical sensor glitch, vacuum line leak, or mechanical valvetrain wear.
How much does it cost to fix code P0340 on a 2019-2024 Nissan Altima?
Estimated repair costs for the 2019-2024 Nissan Altima typically range from – for replacement parts and – for professional labor at certified independent repair shops.