What causes fault code P0342?

• Most likely: Faulty Camshaft Position Sensor (internal short) • Likely: Damaged wiring harness or corrosion in the connector (short to ground) • Possible: Failing starter motor or weak battery (causing electrical interference during cranking) • Rare: Incorrect air gap between sensor and reluctor wheel or a faulty Engine Control Module (ECM)

Powertrain (Engine & Gearbox)Standard EOBD

P0342 - Camshaft Position Sensor 'A' Circuit Low Input (Bank 1)

Q: What are the symptoms of fault code P0342?

• Check Engine Light (MIL) illumination • Hard starting or long cranking times • Engine stalling at idle or while driving • Reduced engine power and hesitation • Increased fuel consumption

Q: How do you fix fault code P0342?

STEP 1: Verify battery voltage and starter motor health, as P0342 is often triggered by voltage drops during cranking. Inspect the sensor connector for corrosion or backed-out pins. STEP 2: Use a multimeter to check for reference voltage (typically 5V or 12V) and a solid ground at the sensor plug. Check the signal wire for a short to ground. STEP 3: Use an oscilloscope to monitor the CMP signal while cranking. You should see a clean digital square wave switching between low and high voltage. STEP 4: If wiring and reference power are correct but the signal is missing or weak, replace the Camshaft Position Sensor.

Last updated:1 February 2026

Related:Camshaft Position Sensor (CMP), Crankshaft Position Sensor (CKP), Wiring, Engine Control Module (ECM), Starter Motor

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0300

Random or Multiple Cylinder Misfire Detected

P0301

Cylinder 1 Misfire Detected

P0302

Cylinder 2 Misfire Detected

P0303

Cylinder 3 Misfire Detected

Technical Description

The P0342 code is stored when the Engine Control Module (ECM) detects a voltage signal from the Camshaft Position (CMP) sensor 'A' that is lower than the specified range during a set period of engine cranking or running. The CMP sensor provides critical data for the synchronization of fuel injection and ignition timing. A 'Circuit Low' condition typically indicates a short to ground in the signal wire, a faulty sensor, or an insufficient reference voltage (on 3-wire sensors), preventing the ECM from accurately tracking the camshaft's position.

Possible Causes

Faulty Camshaft Position Sensor (internal short)

Damaged wiring harness or corrosion in the connector (short to ground)

Failing starter motor or weak battery (causing electrical interference during cranking)

Incorrect air gap between sensor and reluctor wheel or a faulty Engine Control Module (ECM)

Symptoms

Check Engine Light (MIL) illumination

Hard starting or long cranking times

Engine stalling at idle or while driving

Reduced engine power and hesitation

Increased fuel consumption

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P0342 - Camshaft Position Sensor 'A' Circuit Low Input (Bank 1)

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P0342 - Camshaft Position Sensor 'A' Circuit Low Input (Bank 1)

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