# P0340 — Camshaft Position Sensor Circuit

> ClearTheCode diagnostic code reference (not OEM service data).

Source: https://clearthecode.com/codes/P0340

**System:** Powertrain · Ignition / Misfire

**Severity:** moderate

## Description

CMP sensor circuit issue. Can cause hard start, stall. Replace sensor; check wiring.

## Diagnostic snapshot

- **Difficulty:** 6/10 — Intermediate diagnostics
- **Est. repair cost:** $120 – $450
- **Common symptoms:** Check engine light (MIL), Hard starting / long crank before start, Stall at idle or right after start

## Diagnostic workflow

1. Confirm P0340 with a live scan — note pending vs stored and freeze frame data.
2. Verify reported symptoms: Check engine light (MIL), Hard starting / long crank before start, Stall at idle or right after start.
3. Inspect wiring/connectors and related sensors before replacing modules.
4. Most likely fixes: Replace camshaft position sensor / inspect timing chain stretch; Spark plug / coil / ignition diagnosis.
5. Clear codes and road-test; re-scan after two drive cycles if the monitor must set.

## Likely fixes

1. **Replace camshaft position sensor / inspect timing chain stretch** (moderate)
2. **Spark plug / coil / ignition diagnosis** (moderate)

## Related articles

- [Camshaft Position Sensor No Start 2019 Toyota Sequoia](https://clearthecode.com/articles/camshaft-position-sensor-no-start-toyota-sequoia-2019)
- [Camshaft Position Sensor No Start 2001 Toyota Sienna](https://clearthecode.com/articles/camshaft-position-sensor-no-start-toyota-sienna-2001)
- [Symptoms of a faulty camshaft position sensor 1997 Ford E-250](https://clearthecode.com/articles/camshaft-position-sensor-faulty-ford-e-250-1997)