P0348 indicates that the powertrain control module has detected a voltage signal from the Bank 2 camshaft position sensor that is higher than the expected range. This code specifically refers to an electrical circuit issue rather than a mechanical timing problem. The high-voltage condition can result from a faulty sensor, a wiring short to voltage, or a connector fault.
The sensor internal circuitry can fail and output a voltage higher than specified, or short internally to the reference voltage, causing the PCM to detect a high signal on Bank 2.
The CMP signal wire or harness may be rubbed through, melted, or pinched, causing it to short to another power feed circuit and pull the sensor voltage abnormally high.
Corroded, bent, or damaged pins in the sensor or PCM connector can alter circuit resistance and create a high-voltage condition that mimics a sensor failure.
An improperly seated sensor, incorrect air gap, or metallic debris on the sensing tip can distort the signal and cause erratic or stuck-high voltage readings.
A rare internal PCM fault may incorrectly interpret a normal sensor signal as high voltage, but this should only be considered after sensor and wiring have been verified.
You may experience hard starting, stalling, or reduced power, so it is not advisable to continue driving for extended periods; the issue should be diagnosed and repaired promptly.
The sensor is a common cause, but the entire circuit—including wiring and connectors—should be tested before replacement to avoid unnecessary work.
Timing component failures usually trigger performance or correlation codes, not a specific circuit-high fault; P0348 is almost always an electrical problem in the sensor circuit.
No. A failed engine computer is very rare for a circuit-high camshaft sensor code. Most cases are fixed by replacing the sensor or repairing the wiring, and the PCM should be suspected only after thorough testing rules out everything else.