| DTC Data Sheet | |
| System | Powertrain |
| Standard | SAE J2012 / ISO 15031-6 |
| Fault type | Intermittent |
| Official meaning | Camshaft Position Sensor "A" Circuit Intermittent (Bank 1) |
The bank 1 CMP signal disappears or glitches intermittently. Often vibration-induced wiring fault or a CMP that fails when hot.
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P0344 Quick Answer
The bank 1 CMP signal disappears or glitches intermittently. Often vibration-induced wiring fault or a CMP that fails when hot.
What Does P0344 Mean?
Camshaft Position Sensor "A" Circuit Intermittent (Bank 1). The bank 1 CMP signal disappears or glitches intermittently. Often vibration-induced wiring fault or a CMP that fails when hot.
Symptoms
- Random stalling, especially when warm
- Hot-restart problems
- Intermittent misfires
- Check engine light comes and goes
Common Causes
- Heat-soaked CMP failing intermittently (very common)
- Vibration-induced wiring damage or loose connector
- Reluctor damage causing missed pulses
- Excessive air gap
Diagnosis Steps
You’ll need a scan tool capable of reading live powertrain data, a digital multimeter, and access to the wiring diagram for the specific platform.
- Reproduce the failure with the engine warm — heat the CMP body with a heat gun while monitoring live data.
- Watch for dropouts in the cam signal during the heat test.
- Wiggle-test the connector and harness while the engine runs.
- Inspect reluctor visually.
Possible Fixes
- CMP replacement (heat-failure mode is the most common cause)
- Wiring or connector repair when wiggle-test reproduces the fault
Can I Still Drive With P0344?
The vehicle will usually still drive with P0344 stored, but performance, drivability, or emissions will be degraded. The PCM may inhibit emissions monitors and limit closed-loop fueling adjustments. Drive to a workshop, but don’t ignore the code long-term.
How Serious Is This Code?
P0344 is a moderate-priority fault. It will not prevent the engine from running, but unaddressed it can cascade into related faults or damage downstream components such as the catalytic converter. Address within a few drive cycles.
Brand-Specific Guides for P0344
Manufacturer-specific diagnostic procedures with factory data and pin-level details for vehicles where this code commonly sets:
FAQ
Will P0344 clear itself?
Only if the underlying fault was intermittent and self-corrected. Most root causes are persistent and require physical repair.
Can I clear P0344 without fixing it?
You can clear it with a scan tool, but it will return as soon as the fault condition reappears — typically within one or two drive cycles.
Is P0344 related to other codes?
Often, yes. Adjacent codes in the same circuit or system frequently set together — if P0344 is present, scan for related codes and address them as a group.