P0348

What it means

P0348 means the engine control unit has detected a high voltage or signal fault in the camshaft position sensor A circuit on bank 2. The control unit saw a signal voltage above the expected range, or a signal that does not make sense compared with the crankshaft position signal. Bank 2 is the side of the engine that does not contain cylinder number one, and sensor A is usually the intake or only camshaft sensor on that bank, though this depends on the engine.

Symptoms

• Engine management light on
• Long cranking or hard starting
• Engine stalling or cutting out
• Rough running or misfiring
• Loss of power or poor acceleration
• Engine running in a limp mode with reduced performance

Possible causes

• Open circuit or short to voltage in the sensor signal wire, or a damaged wiring harnesslikely
• Corroded, loose or damaged connector at the camshaft position sensorlikely
• Faulty camshaft position sensor on bank 2likely
• Open circuit in the sensor ground or fault in the sensor reference supplypossible
• Damaged or misaligned reluctor or trigger wheel, or incorrect cam timingpossible
• Electrical interference from a faulty component or poor earth connectionrare
• Fault inside the engine control unitrare

How to diagnose

1. Read all stored and pending codes and record the freeze frame data, noting engine speed, temperature and load when the fault set.
2. Check for other codes, especially crankshaft position or other camshaft sensor codes, which can point to a shared wiring or supply fault.
3. Inspect the bank 2 camshaft sensor, its connector and the wiring for chafing, heat damage, oil contamination, corrosion and loose pins.
4. Check the sensor reference supply, ground and signal voltages against the manufacturer's data for the specific engine.
5. Test the signal wire for continuity and for short to voltage between the sensor and the control unit with the battery disconnected as appropriate.
6. Check the live data for cam and crank synchronisation while cranking and running, and view the signal on an oscilloscope if available.
7. Inspect the reluctor or trigger wheel and the sensor mounting for damage, looseness or debris, and check cam timing if the signal pattern is wrong.
8. Clear the code and road test to see whether it returns, and recheck that the repair has held.

How to fix

• Repair or replace damaged wiring, and ensure the harness is properly routed and secured.
• Clean or replace corroded or damaged connectors and terminals.
• Replace the bank 2 camshaft position sensor if it fails testing, using a part suitable for the engine.
• Repair the sensor supply or ground fault found during testing.
• Repair or replace a damaged trigger wheel and correct the cam timing as per the manufacturer's procedure.
• Repair or replace the engine control unit only after all wiring and sensor faults have been ruled out.

Can I keep driving?

Nearby codes

• P0347GenericCamshaft Position Sensor A Circuit Low Bank 2
• P0349GenericCamshaft Position Sensor A Circuit Intermittent Bank 2