P0344
Camshaft Position Sensor Circuit High Input
Powertrain Ignition System Camshaft Timing Sensor 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The camshaft position sensor is sending a voltage signal that's too high, like a speaker turned up too loud. The ECU can't properly read the timing of the camshaft, which disrupts engine ignition and fuel injection.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rough idle or stalling
Poor acceleration and reduced fuel economy
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the analog voltage output from the camshaft position sensor, expecting a signal within a specific range. When voltage exceeds the maximum threshold, the ECU interprets this as a circuit malfunction or sensor failure. This prevents proper camshaft synchronization with crankshaft timing.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Output Voltage 0.5–4.5 volts > 4.8 volts (high input)
Signal Frequency 5–100 Hz (engine-dependent) No signal or erratic pulses
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Camshaft Position Sensor connector
Inspect and clean the connector pins for corrosion, dirt, or loose contact; reseat the connector firmly.
2
Camshaft Position Sensor wiring harness
Check wiring for cracks, pinches, or damage; repair or replace any compromised sections.
3
Camshaft Position Sensor
Replace the sensor if it is failed or producing out-of-range voltage signals.