P0349
Camshaft Position Sensor A Circuit Intermittent (Bank 2)
Powertrain Ignition System Camshaft Timing Control 🟡 Moderate — Fix within a week
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What This Actually Means
In plain language — no jargon

The engine computer is losing its connection to the camshaft position sensor on the right side of the engine, like a radio signal cutting in and out. This causes the engine to struggle with timing because it doesn't know exactly where the camshaft is positioned.

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Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminates intermittently
Rough idle or occasional hesitation during acceleration
Reduced fuel economy
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Embedded Systems Insight
What the ECU/ECM is actually computing

The ECU monitors the camshaft position sensor's voltage signal to determine valve timing on Bank 2. It expects a consistent frequency and amplitude; intermittent loss of signal indicates a loose connection, corroded terminal, or failing sensor causing voltage dropout.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Signal Voltage 0.5–4.5V (continuous) Intermittent dropout or signal loss >0.2 seconds
Signal Frequency Synchronized with crankshaft Loss of synchronization or erratic pulses
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
CPS connector and wiring harness
Inspect and clean the camshaft position sensor connector on Bank 2 for corrosion or loose pins, then reconnect firmly.
2
Camshaft Position Sensor (Bank 2)
Remove the sensor from the cylinder head, inspect for debris, reinstall with proper torque, or replace if damaged.
3
Engine wiring harness repair
Check the CPS circuit for frayed insulation, cracks, or loose connections between the sensor and ECU.