P0392Camshaft Position Sensor B Circuit Low Bank 2
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Camshaft position sensor B is the exhaust camshaft sensor; bank 2 is the side without cylinder 1, so the code only occurs on V and boxer engines with one exhaust cam sensor per bank. P0392 means the bank 2 exhaust cam signal stays low without edges – typically a short to ground of the signal wire, a sensor output stuck low or a missing 5 V reference. Only manufacturers with separate low and high codes use it: on the Saab 9-4X 2.8 turbo V6 (GM LAU) the signal must stay low without pulses for more than 1 s, or 10 s cumulatively, after more than 10 crank revolutions and below 2,520 rpm, after two trips; GM's 2004/2005 3.6-litre V6 (LY7, LP1) counts the fault over two drive cycles. Newer GM petrol engines (2015–2020) and Ford report the same fault as P0390. The consequence is as for P0390: cam timing on bank 2 in its base position, loss of power, longer cranking.
- What you may notice
- Check engine light on
- Loss of power (bank 2 exhaust cam timing in its base position)
- Longer cranking
- Rough idle
- Likely causes
- LikelySignal wire shorted to ground
- PossibleSensor faulty internally (output stuck low)
- Possible5 V reference missing (shorted by another sensor on the same circuit)
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.