P0342
Camshaft Position Sensor Circuit Range/Performance
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 giving readings that are outside the normal range or not matching engine timing—think of it like a clock that's ticking too fast or slow. The engine computer can't trust the sensor signal to properly control fuel injection and spark timing.

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

The ECM monitors the camshaft position sensor signal voltage and frequency to verify cam timing aligns with crankshaft position. The sensor should produce a clean digital or analog signal that matches engine RPM and load conditions. If the signal drifts outside expected voltage ranges or frequency patterns, the ECM detects a range/performance fault.

Voltage & Parameter Thresholds

Parameter Normal Range Fault Condition
Sensor Signal Voltage 0.5–4.5V (varies by sensor type) <0.2V or >4.8V, or signal dropout
Signal Timing Correlation Cam position matches crankshaft within ±5° crank angle Deviation >10° or intermittent signal loss
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Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Camshaft Position Sensor
Disconnect the sensor connector, remove the bolt holding the sensor in place, and install a new sensor; verify connector is clean and seated firmly.
2
Sensor Wiring Harness
Inspect the wiring from the sensor to the ECM for cuts, corrosion, or loose connectors; clean or repair any visible damage.
3
Engine Oil and Filter
Change engine oil and filter to ensure proper sensor operation; dirty oil can cause sensor malfunction or timing chain wear.