P0392: Camshaft Position Sensor B Circuit Low Bank 2

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.

Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.

Symptoms

• Check engine light on
• Loss of power (bank 2 exhaust cam timing in its base position)
• Longer cranking
• Rough idle

Most likely causes

• Signal wire shorted to ground
• Sensor faulty internally (output stuck low)
• 5 V reference missing (shorted by another sensor on the same circuit)
• Engine module

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and look for metal filings on the sensor
2. With the connector unplugged, check whether the signal wire is making contact with ground.
3. See whether there is an RPM signal while cranking
4. Measure the signal with an oscilloscope if you can
5. Check the engine timing before replacing expensive parts

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P0392 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 3: Ignition and misfires
• 92: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0392?

Avoid driving: the engine can stall while moving. If the timing is off, continuing can cause serious damage.

What causes code P0392?

The most common causes are: signal wire shorted to ground; sensor faulty internally (output stuck low); 5 V reference missing (shorted by another sensor on the same circuit).

Related codes

• P0390Camshaft Position Sensor B Circuit Bank 2
• P0391Camshaft Position Sensor B Circuit Range/Performance Bank 2
• P0393Camshaft Position Sensor B Circuit High Bank 2
• P0394Camshaft Position Sensor B Circuit Intermittent Bank 2
• P0367Camshaft Position Sensor B Circuit Low Bank 1
• P0347Camshaft Position Sensor A Circuit Low Bank 2

Sources

• saabwisonline.com: dtc p0341 p0342 p0343 p0346 p0347 p0348 p0366 p036
• gsi.ext.gm.com: 2004file14
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.