P0344
Camshaft Position Sensor A Circuit Intermittent Bank 1
The engine computer is losing the camshaft position sensor signal on bank 1 or the single sensor. This can cause rough running, hard starting, stalling, or poor acceleration. The problem is often caused by a bad connector, wiring issue, or a failing sensor.
- SEV
- 3/5
- DRIVE
- CAUTION
- DIY
- $20–$120
- SHOP
- $150–$500
Quick answer
AI-CITATION READYWhat it means
Can you drive with it?
Most common causes
- Loose, corroded, oil-soaked, or damaged camshaft position sensor connector
- Intermittent wiring fault in the cam sensor circuit, including broken wire, rubbed insulation, or poor ground
- Failing camshaft position sensor
Typical repair cost
DIY usually runs $20–$120. Typical shop repair lands around $150–$500, depending on the root cause.
01 / Definition
P0344 means the powertrain control module has detected an intermittent or unstable signal from camshaft position sensor A on bank 1, or the only cam sensor on a single-sensor engine. The fault may be in the sensor itself, the wiring, the connector, or less commonly the tone wheel, timing components, or PCM signal processing.
02 / Drive status
With caution. The vehicle may still run, but it can stall, hesitate, or run poorly without warning. Avoid long trips and repair it soon, especially if the engine is hard to start or stalls.
03 / Symptoms
- Check engine light
- Hard starting or extended cranking
- Engine stalling
- Rough idle
- Hesitation or poor acceleration
- Reduced fuel economy
- Misfire-like symptoms
- Engine may run normally at times and fail intermittently
04 / Causes
| 1 | Loose, corroded, oil-soaked, or damaged camshaft position sensor connector | high |
|---|---|---|
| 2 | Intermittent wiring fault in the cam sensor circuit, including broken wire, rubbed insulation, or poor ground | high |
| 3 | Failing camshaft position sensor | high |
| 4 | Timing chain stretch, timing belt issues, or cam phaser problems causing unstable cam signal | medium |
| 5 | Contaminated sensor tip from oil, metal debris, or engine sludge | medium |
| 6 | Damaged reluctor wheel or tone ring | low |
| 7 | PCM issue or software problem | low |
05 / Diagnostic sequence
- 01Check for other codes, especially crankshaft sensor codes, misfire codes, or timing-related codes.
- 02Inspect the camshaft position sensor connector for looseness, corrosion, oil intrusion, bent pins, or damaged lock tabs.
- 03Inspect the wiring harness near the sensor and along the engine for rubbing, heat damage, or broken wires.
- 04Clear the code and road test or wiggle-test the harness to see if the code returns.
- 05Check sensor power, ground, and signal wiring with a multimeter or lab scope if available.
- 06Compare cam and crank sensor data to verify the cam signal is stable and synchronized.
- 07Inspect the sensor tip for contamination and verify the timing system if electrical checks pass.
- 08If the circuit tests are good, substitute a known-good sensor or follow OEM pinpoint tests for PCM verification.
06 / Repairs
| 1 | Clean, repair, or secure the camshaft sensor connector and wiring | $0–$50 |
|---|---|---|
| 2 | Replace the camshaft position sensor if testing shows an intermittent or failed sensor | $20–$120 |
| 3 | Repair damaged harness wiring, grounds, or terminals | $50–$250 |
| 4 | Repair timing chain, timing belt, cam phaser, or reluctor wheel issues if found | $300–$1,500 |
| 5 | Update PCM software or diagnose PCM circuit faults if all other causes are ruled out | $0–$200 |
07 / Related codes
08 / FAQ
Can a bad camshaft position sensor cause P0344?
Yes. A failing sensor is one of the most common causes of P0344.
Can I drive with P0344?
Only with caution and only for a short distance if the engine is running normally. If it stalls, runs very rough, or is hard to start, do not continue driving.
Will P0344 clear itself?
It may disappear temporarily if the signal comes back, but the underlying fault usually remains and the code often returns.
Does P0344 mean the timing chain is bad?
Not always. Wiring and sensor problems are more common, but timing system problems can also cause this code.
09 / Source and method
- DATA BASIS
- OBD-II REFERENCE + OBD2.HELP
- METHOD
- STATIC VALIDATION
- SAFETY
- INFORMATIONAL
This page combines OBD-II diagnostic reference data with OBD2.help generated diagnostic guidance for code meaning, likely causes, and repair direction.
Publishing uses deterministic schema and build validation, plus manual spot checks on representative pages before release.
Safety-critical diagnosis and repairs should be confirmed with a qualified mechanic, especially when the vehicle is misfiring, overheating, or losing power.