P0392 – Camshaft Position Sensor “B” Circuit Low Bank 2

P0392 is an OBD-II trouble code that points to a problem with the camshaft position sensor “B” circuit on Bank 2. In plain English, your engine computer is not happy with the signal it’s getting from one of the cam sensors on the side of the engine that doesn’t have cylinder #1. This can cause rough running, hard starts, and poor fuel economy. In this guide, you’ll learn what P0392 means, common causes, symptoms, how a mechanic diagnoses it, and what it usually costs to fix.

What Does P0392 Mean?

P0392 stands for “Camshaft Position Sensor ‘B’ Circuit Low (Bank 2).” The ECU is seeing a low or weak signal from the “B” camshaft position sensor on Bank 2. “Circuit low” usually means the voltage is below the expected range, often due to wiring problems, sensor failure, or poor connections.

Bank 2 is the side of a V6 or V8 engine that does not contain cylinder #1. Sensor “B” is typically the exhaust cam sensor on that bank, but exact naming can vary by manufacturer. When this signal is bad or missing, the ECU can’t accurately control ignition timing and variable valve timing, which leads to drivability issues and a check engine light.

Quick Reference

• Code: P0392
• Meaning: Camshaft Position Sensor “B” Circuit Low, Bank 2
• Main areas: Bank 2 cam sensor, wiring, connectors, ECU input
• Risk: Moderate – may cause poor performance and potential engine damage if ignored
• Typical fixes: Repair wiring, replace cam sensor, occasionally timing or ECU repair

Real-World Example / Field Notes

In the shop, I see P0392 most often on higher-mileage V6 SUVs and trucks. A common scenario: you come in complaining about intermittent hard starts and a rough idle when hot. The check engine light is on, maybe with a slight loss of power on the highway. I hook up the scan tool, pull P0392, and look at live data. One cam sensor on Bank 2 is dropping out or reading erratically compared to the others. A quick visual inspection shows a brittle connector or oil-soaked wiring harness near the valve cover. After repairing the wiring or replacing the sensor, the engine smooths out and the code stays gone.

Symptoms of P0392

• Check engine light illuminated, sometimes with other cam/crank sensor codes
• Hard starting, especially when the engine is hot or after a short shut-down
• Rough idle or unstable RPM, sometimes feeling like a slight misfire
• Reduced power and sluggish acceleration due to incorrect valve timing
• Poor fuel economy because the ECU can’t optimize ignition and cam timing
• Stalling at stops or when shifting into gear in severe cases
• Hesitation or surging during light throttle cruising or when climbing hills

Common Causes of P0392

Most Common Causes

• Failed camshaft position sensor “B” (Bank 2) – internal failure or sensor shorted to ground
• Damaged wiring to the Bank 2 cam sensor – chafed, broken, or oil-soaked harness
• Corroded or loose connector at the cam sensor – poor contact causing low signal voltage
• Improperly installed sensor after previous work – incorrect air gap or wrong part number
• Oil contamination inside the sensor or connector from valve cover leaks

Less Common Causes

• Timing chain or belt issues – stretched chain, jumped timing, or worn guides affecting cam signal pattern
• Faulty crankshaft position sensor – causing sync issues between crank and cam signals
• ECU (PCM) input fault – rare, but possible if wiring and sensor test good
• Aftermarket remote start or alarm wiring spliced into the sensor circuit creating interference
• Internal engine wear (excessive camshaft end play or damage) altering the sensor signal

Diagnosis: Step-by-Step Guide

For diagnosing P0392, you ideally want a good scan tool with live data, a digital multimeter, and if possible an oscilloscope. Basic hand tools, a wiring diagram, and access to service information for your specific vehicle are also very helpful.

1. Confirm the code and check for companions. Scan the vehicle and note all stored and pending codes. If you see other cam or crank sensor codes (P0390, P0391, P034x, P0335), you may be dealing with a broader timing or wiring issue.
2. Check freeze frame data. Look at engine RPM, load, coolant temperature, and speed when P0392 set. This helps you know if it happens at start-up, idle, or cruising, which guides your test drive.
3. Perform a visual inspection. Locate Bank 2 camshaft position sensor “B” (often exhaust side). Inspect the connector and harness for broken insulation, rubbing on brackets, oil saturation, or bent pins.
4. Wiggle test the harness. With the engine idling and scan tool watching cam sensor data, gently move the harness and connector. If the signal drops out or the engine stumbles, you likely have an intermittent wiring or connector issue.
5. Check sensor power and ground. Using a multimeter and wiring diagram, verify the sensor is getting proper reference voltage (usually 5V) and has a good ground. A missing power or ground can cause a “circuit low” code.
6. Measure signal voltage. Back-probe the signal wire with the engine running. For a Hall-effect sensor, you should see a pulsing voltage (often 0–5V). A flat low reading or no change indicates a bad sensor or short to ground.
7. Compare cam/crank signals. With an advanced scan tool or oscilloscope, compare Bank 2 cam “B” signal to the crankshaft sensor and other cam sensors. If the pattern is inconsistent or missing only on that sensor, it points directly to that circuit.
8. Inspect timing components if needed. If the sensor and wiring test good but the signal is still off, check for timing chain or belt issues. Listen for rattling on cold start and inspect timing marks if accessible.
9. Use Mode $06 data (if available). Some vehicles store detailed test results for cam/crank correlation. Reviewing Mode $06 can confirm if the ECU is repeatedly failing the cam sensor test before the code sets.
10. Substitute a known-good sensor. As a final step, if everything else checks out, install a quality replacement cam sensor and retest. Clear codes and perform a road test to verify the fix.

Pro tip: Always use an OEM or high-quality aftermarket cam sensor. Cheap sensors often cause intermittent issues and can lead you in circles with repeat P0392 codes.

Possible Fixes & Repair Costs

The exact repair depends on what you or your mechanic find during diagnosis, but most P0392 fixes are straightforward once the root cause is identified.

• Repair or replace damaged wiring or connectors to the Bank 2 cam sensor
• Replace the camshaft position sensor “B” (Bank 2) with a quality part
• Clean and reseat electrical connectors, remove corrosion, and apply dielectric grease
• Repair oil leaks (such as valve cover gaskets) that are soaking the harness and sensor
• Address timing chain/belt problems if the cam timing is out of spec
• In rare cases, repair or replace the ECU if the input circuit is faulty

Typical repair costs for P0392 vary. A basic cam sensor replacement usually runs $120–$350 parts and labor, depending on vehicle and access. Wiring repairs can range from $100–$400 if harness work is needed. Timing chain or belt-related repairs are more involved and can easily reach $800–$1,500 or more. Costs depend on labor rates, part quality, and how buried the sensor or timing components are on your specific engine.

Can I Still Drive With P0392?

In many cases, you can still drive with P0392 for a short time, but it’s not ideal. If the engine is running relatively smoothly and only the check engine light is on, you may be able to drive to a shop or finish a short trip. However, if you notice stalling, severe loss of power, or hard starting, you risk being stranded or causing further damage. Because this code affects timing control, it’s best to diagnose and repair it as soon as possible rather than continuing to drive for weeks.

What Happens If You Ignore P0392?

If you ignore P0392, the engine may run with incorrect cam timing, which can lead to poor fuel economy, increased emissions, and long-term stress on internal components. Misfires or severe timing errors over time can damage the catalytic converters, and in extreme cases, timing issues can contribute to internal engine damage.

Related Sensor Camshaft Codes

Compare nearby sensor camshaft trouble codes with similar definitions, fault patterns, and diagnostic paths.

• P0367 – Camshaft Position Sensor “B” Circuit Low Bank 1
• P0337 – Crankshaft Position Sensor “A” Circuit Low
• P0387 – Crankshaft Position Sensor “B” Circuit Low
• P0807 – Clutch Position Sensor Circuit Low
• P2962 – Intake Air Metering Control Valve Position Sensor Circuit Low
• P2615 – Camshaft Position Signal Output Circuit Low

Key Takeaways

• P0392 means the ECU is seeing a low or weak signal from the Bank 2 camshaft position sensor “B.”
• Common causes include a bad cam sensor, damaged wiring, or corroded connectors, with timing issues less common but possible.
• Symptoms range from a simple check engine light to hard starting, rough idle, and loss of power.
• Proper diagnosis involves checking wiring, power/ground, and signal voltage, not just throwing parts at the problem.
• Most repairs are in the $120–$400 range, but timing-related issues can be significantly more expensive.
• Driving with P0392 for long periods is not recommended due to potential engine and catalytic converter damage.

Vehicles Commonly Affected by P0392

P0392 shows up on many modern OBD-II vehicles, but it’s especially common on V6 and V8 engines where there are multiple cam sensors per bank. You’ll often see it on:

• Ford SUVs and trucks (Explorer, F-150, Edge) with V6/V8 engines
• Chevrolet/GMC models (Traverse, Equinox, Silverado, Sierra) with 3.6L and similar engines
• Dodge/Chrysler/Jeep vehicles with Pentastar and HEMI engines
• Nissan/Infiniti VQ-series V6 and some V8 models
• Hyundai/Kia V6 engines found in SUVs and sedans

The exact layout and naming of “sensor B” on Bank 2 vary by manufacturer, so always confirm sensor location and wiring using service information specific to your vehicle.

FAQ

Can I clear P0392 and keep driving if the car feels fine?

You can clear the code, but if the underlying problem is still there, P0392 will usually return. Even if the car feels fine now, the issue can worsen over time and leave you with hard starts, stalling, or more expensive repairs. It’s better to diagnose and fix it instead of repeatedly clearing the code.

Is P0392 caused by a bad timing chain?

P0392 can be related to timing chain problems, but that’s not the most common cause. Most of the time it’s a failing cam sensor or wiring issue. A stretched or jumped timing chain is usually suspected when you also have correlation codes (like P0017) or loud rattling noises on start-up.

How do I know which side is Bank 2 for P0392?

Bank 2 is the side of the engine that does not contain cylinder #1. The exact location depends on engine design and orientation. Your owner’s manual usually won’t show this, so you’ll want a repair manual or online service information for your specific engine to correctly identify Bank 2 and sensor “B.”

Can a bad crankshaft sensor trigger P0392?

Yes, a failing crankshaft position sensor can indirectly contribute to P0392 by causing sync issues between the crank and cam signals. However, if only P0392 is present, the problem is more likely in the Bank 2 cam sensor “B” circuit itself. If you see both crank and cam codes, check both sensors and the timing components.

Do I need to replace all cam sensors if one sets P0392?

No, you don’t have to replace all of them. You should focus on diagnosing the specific Bank 2 sensor “B” circuit first. That said, on high-mileage engines where multiple sensors are aged and hard to access, some owners choose to replace them in pairs or sets as preventive maintenance, but it’s not mandatory.