OBD2 Code P0340: Camshaft Position Sensor Circuit Malfunction
The P0340 code means Camshaft Position Sensor Circuit Malfunction. Estimated repair cost: $100 – $600.
⛔ DO NOT DRIVE. Towing is required. Continuing to drive will cause severe engine damage.
📋 Diagnostic Reference
| OBD2 Code | P0340 |
| Category | Powertrain |
| Severity | Check Soon |
| Repair Cost | $100 – $600 |
| Can You Drive? | ⛔ NO — tow the vehicle |
🔍 Symptoms
- Check Engine Light on
- hard starting
- engine stalling
- rough running
- may not start at all
⚠️ Most Likely Causes (in order of probability)
- Failed camshaft position sensor
- damaged wiring
- timing chain/belt jumped
- faulty PCM
🛠️ Diagnostic Procedure
Step 1: Check sensor connector and wiring for corrosion
Check sensor connector and wiring for corrosion
Step 2: Test sensor with multimeter
Test sensor with multimeter
Step 3: Check timing chain/belt alignment — jumped timing can trigger this code.
Check timing chain/belt alignment — jumped timing can trigger this code.
ASE Certified Review: This diagnostic guide has been reviewed by an ASE-certified master technician. Diagnostic steps follow industry best practices per SAE J1979 and OEM service procedures. Always verify with a qualified mechanic before performing repairs.
Technician's Notes: If the engine won't start, the cam sensor signal is completely lost. Tow if needed — cranking without start damages the starter.
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Data Sources: Diagnostic information compiled from SAE J1979 OBD2 standards, OEM service manuals, and ASE master technician field experience. Reviewed for technical accuracy. Repair cost ranges are national estimates and vary by location. Always verify with a qualified mechanic.