P0348

P0348 is the opposite of P0347 - the Bank 2 CMP A signal is pinned high (typically above 4.9V on a 5V Hall-effect circuit), which the PCM interprets as an open signal circuit, an open ground, or a sensor that has gone fully open internally. Cheapest-first ladder: jump the signal pin to the sensor ground pin at the Bank 2 CMP harness connector with key-on - if the PCM now reports a valid (typically pinned-low) cam signal, the sensor is open internally and replacement clears it. If jumping the pins produces no PCM response, the open is in the signal wire, the sensor ground, or the PCM input itself - verify ground continuity (under 0.1 ohm to PCM ground), then resistance-check the signal wire end-to-end. Confirm the 5V reference at the connector is 4.9 to 5.1V key-on. On Hall-effect CMPs the live signal should toggle 0 to 5V square wave; on VR sensors the live signal swings 0.5 to 8V AC depending on RPM. Verify the sensor air gap to the reluctor wheel is within spec (typically 0.020 to 0.050 inch) - a sensor that has walked in its bore reads pinned-high exactly like an open circuit. The expensive misdiagnosis is replacing the PCM for an open coil-driver when the actual fault is a corroded ground splice or a broken signal wire under harness loom - always verify ground path and wire continuity before condemning the PCM.

Vehicle-specific patterns: 2007-2014 Ford 3.5L/3.7L Cyclone V6 Bank 2 CMP harness chafes against the rear cylinder head exhaust manifold heat shield, opening the signal wire after long highway miles. 2011-2018 Chrysler 3.6L Pentastar Bank 2 CMP connector backs out of the sensor at the rear of the cylinder head from vibration - reseat the connector with a fresh CPA lock before replacing parts. 2010-2016 Hyundai/Kia 3.3/3.8 Lambda V6 Bank 2 CMP loses ground continuity at the underhood ground stud near the rear cylinder head - clean and retorque the ground before swapping the sensor. 2007-2013 Toyota 2GR-FE V6 (Camry, RAV4, Highlander, Sienna) Bank 2 CMP can develop an internal open after 150k miles and reads pinned-high cold but recovers warm; verify with key-on cold backprobe before condemning. 2008-2014 Nissan VQ35DE/VQ40DE Bank 2 CMP can lose its sensor ground when the underhood harness is disturbed during a valve cover gasket job - a common return-visit complaint. Estimated repair: $60 to $340.