P0348
Camshaft Position Sensor A Circuit High Input (Bank 2)
If your code reader dashboard displays the generic DTC error code P0348, your vehicle is currently experiencing an active failure related to "Camshaft Position Sensor A Circuit High Input (Bank 2)". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
A P0348 fault code points directly to a problem with camshaft position sensor a circuit high input (bank 2) that the ECM has confirmed over multiple drive cycles. The most common signs are no start condition, rough idle, mil illuminated. This is a serious fault — avoid extended driving and have your vehicle inspected by a mechanic as soon as possible to prevent further damage.
Symptoms
No start condition, rough idle, MIL illuminated
Common Causes
- Short to battery voltage
- Open circuit or unplugged sensor
- Failed camshaft sensor
- PCM fault
How to Fix
- 1 Fix short to power
- 2 Plug in sensor or repair wiring
- 3 Replace Bank 2 camshaft sensor
- 4 Replace PCM
Technical Explanation
P0348 is stored after the control module confirms the fault over multiple ignition cycles, ruling out transient electrical noise as the cause. For injector-specific codes, the ECM monitors the injector control circuit voltage drop during each pulse; a shorted or open injector presents a characteristic resistance signature that differs measurably from a healthy unit. Once confirmed, the code is stored as a permanent DTC and the MIL is activated. The freeze frame snapshot — recording RPM, load, coolant temperature, and fuel trim at fault detection — is also saved and is critical for accurate diagnosis.
Is It Safe to Drive?
Driving with an active P0348 fault risks accelerating damage to short to battery voltage and related components. The longer the fault persists, the more expensive the eventual repair becomes — what starts as a sensor or solenoid issue can escalate to major mechanical failure.
Mechanic's Pro Tip
The most common mistake with P0348 is replacing the sensor without verifying the reference voltage and ground integrity first. Use a scan tool to monitor the sensor's live output; a truly failed sensor shows a stuck, flatlined reading — a sensor that fluctuates but reads slightly off usually indicates a wiring or vacuum issue, not a dead sensor. Always spray electrical contact cleaner on the connector pins before condemning the sensor.
Sensor replacement: 100 - 250