What causes fault code P0348?

• Most likely: Faulty camshaft position sensor (internal short) • Likely: Short to voltage in the sensor signal wiring • Possible: Open circuit in the sensor ground wire • Rare: Reluctor ring/tone wheel damage or misalignment • Rare: Internal Engine Control Unit (ECU) failure

How do you fix fault code P0348?

STEP 1: Visually inspect the camshaft sensor connector for corrosion or backed-out pins. Clean with contact cleaner if necessary. STEP 2: Measure the reference voltage (typically 5V) and sensor ground using a multimeter with ignition ON. Ground resistance should be < 1 Ohm. STEP 3: Use an oscilloscope to probe the signal wire while cranking. A clean square wave should be visible. If the signal stays high constantly, the sensor is likely faulty. STEP 4: Check the wiring harness for shorts to power between the sensor and the ECU. STEP 5: Replace the Camshaft Position Sensor on Bank 2.

Powertrain (Engine & Gearbox)Standard EOBD

P0348 - Camshaft Position Sensor A Circuit High Input (Bank 2)

Q: What does fault code P0348 mean?

P0348 is set when the Engine Control Unit (ECU) detects an abnormally high voltage signal from the Camshaft Position (CMP) sensor 'A' on Bank 2. This usually indicates that the signal circuit is shorted to voltage or there is an open ground circuit. The CMP sensor provides critical timing data for fuel injection and ignition spark. A 'High Input' condition prevents the ECU from correctly identifying the engine cycle position, often leading to a fallback to crankshaft-only timing or limp mode.

Q: What are the symptoms of fault code P0348?

• Check Engine Light (MIL) illumination • Hard starting or long cranking times • Engine stalling or hesitating during acceleration • Reduced engine power and fuel efficiency • Vehicle may enter Limp Home Mode

Last updated:1 February 2026

Related:Camshaft Position Sensor (CMP), Crankshaft Position Sensor (CKP), Engine Control Unit (ECU), Wiring Harness, Camshaft Position Sensor

System

Powertrain (Engine & Gearbox)

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Technical Description

P0348 is set when the Engine Control Unit (ECU) detects an abnormally high voltage signal from the Camshaft Position (CMP) sensor 'A' on Bank 2. This usually indicates that the signal circuit is shorted to voltage or there is an open ground circuit. The CMP sensor provides critical timing data for fuel injection and ignition spark. A 'High Input' condition prevents the ECU from correctly identifying the engine cycle position, often leading to a fallback to crankshaft-only timing or limp mode.

Possible Causes

Faulty camshaft position sensor (internal short)

Short to voltage in the sensor signal wiring

Open circuit in the sensor ground wire

Reluctor ring/tone wheel damage or misalignment

Internal Engine Control Unit (ECU) failure

Symptoms

Check Engine Light (MIL) illumination

Hard starting or long cranking times

Engine stalling or hesitating during acceleration

Reduced engine power and fuel efficiency

Vehicle may enter Limp Home Mode

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P0348 - Camshaft Position Sensor A Circuit High Input (Bank 2)

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P0348 - Camshaft Position Sensor A Circuit High Input (Bank 2)

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