OBD-II Code P0365 — What It Means & How to Fix It

What Does This Error Mean?

P0365 means the PCM is seeing a signal from the Bank 1 camshaft position sensor B that is outside the expected range. Sensor B refers to the exhaust camshaft on Bank 1 in most engines. Bank 1 is the side of the engine that contains cylinder number 1. Expect rough idle, hard starting, poor fuel economy, and possibly a cam timing fault.

Affected Models

All 1996+ vehicles with variable valve timing (VVT) or dual overhead cam (DOHC) engines
Common in Toyota and Lexus with VVT-i engines
Common in Honda and Acura with i-VTEC engines
Common in BMW engines with VANOS variable valve timing
Common in Ford engines with Ti-VCT (Twin Independent Variable Camshaft Timing)

Common Causes

Failed or weak camshaft position sensor B on Bank 1
Damaged, corroded, or broken wiring in the camshaft position sensor B circuit
Loose, dirty, or corroded sensor connector
Metal debris or buildup on the tone wheel (reluctor ring) on the camshaft
Stretched or jumped timing chain causing the camshaft signal to fall outside the expected range

How to Fix It

Confirm which bank and which cam sensor is involved. Bank 1 contains cylinder number 1. Sensor B refers to the exhaust camshaft in most DOHC engines. Your service manual will show you the exact sensor location for your vehicle.

On some inline-4 and inline-6 engines, there is only one bank, so Bank 1 is the entire engine. On V6 and V8 engines, Bank 1 is always the side with cylinder 1.
Inspect the camshaft position sensor B connector and wiring. Look for corrosion, pushed-back terminals, cracked insulation, or a connector that is not fully seated. Clean the connector and wiring harness connections with electrical contact cleaner.

Camshaft position sensors on DOHC engines are often located on the cam cover near the timing chain end of the engine. They are exposed to oil vapors and heat, which can degrade connectors over time.
Check the sensor's reference voltage and ground. With the ignition on, use a multimeter to verify the sensor is receiving the proper supply voltage — usually 5V or 12V depending on the sensor type. Also verify a good ground on the sensor circuit.

A sensor that is not receiving proper voltage will give a range or performance fault even if the sensor itself is perfectly good. Always check the circuit before condemning the sensor.
Replace the camshaft position sensor B on Bank 1. The sensor is usually held in by one bolt or a simple twist-lock. Clean the sensor mounting bore and install the new sensor. Reconnect the harness firmly.

Make sure to use the correct sensor for Bank 1 Sensor B. On DOHC engines, intake and exhaust camshaft sensors may look identical but have different calibrations or part numbers. Use your vehicle's VIN to confirm the exact part.
Clear all stored codes and drive the vehicle through a full warm-up cycle including idle and highway speeds. Recheck with a scanner to confirm P0365 has not returned. If it does return, inspect the camshaft reluctor ring and check timing chain stretch.

If P0365 comes back after a new sensor, the timing chain or VVT actuator is likely the real cause. This requires deeper mechanical diagnosis.

When to Call a Professional

If the sensor and wiring check out fine, the fault may be a mechanical timing issue — a stretched chain, jumped timing, or worn VVT actuator. These repairs are labor-intensive and beyond typical DIY work. A stretched timing chain diagnosis runs $80-$150 at most shops. Full timing chain replacement can cost $700-$2,500 depending on the engine. Do not continue driving if you suspect a timing chain issue — engine damage can result.

Frequently Asked Questions

What does sensor B mean on a camshaft position code?

Sensor A always refers to the intake camshaft in a DOHC engine. Sensor B refers to the exhaust camshaft. On engines with only one camshaft (SOHC), there is only an A sensor. So P0365 means the exhaust cam sensor on the same bank as cylinder 1 is the one with the problem.

Can a bad cam sensor cause hard starting or a no-start?

Yes. The camshaft position sensor helps the PCM determine exactly where in the engine cycle each cylinder is. If the signal is missing or wildly out of range, the PCM may not be able to properly time fuel injection or ignition. Some vehicles will still start and run with a bad cam sensor; others will not start at all.

How much does a camshaft position sensor cost?

The sensor itself usually costs $20-$80 for most common vehicles. Installation is typically simple — one bolt and a connector — taking under 30 minutes. If the fault turns out to be a stretched timing chain rather than the sensor, costs jump significantly to $700-$2,500 for the chain replacement.