What Does P0365 Mean?
The ECM is not receiving a valid signal from camshaft position sensor B on bank 1. On engines with dual overhead cams (DOHC), sensor B monitors the exhaust camshaft. This sensor is essential for proper sequential fuel injection timing and exhaust camshaft variable valve timing control. The driver may experience hard starting, rough idle, reduced power, and the engine may default to a backup fuel injection strategy.
Safety Warning
If the engine starts and runs in degraded mode, drive only short distances to a repair shop. The engine will run with reduced efficiency and the exhaust VVT system will be disabled. If the engine does not start or stalls, do not drive. Some vehicles will not start at all without the CMP B signal.
Common Causes
35%
Failed camshaft position sensor B (dead Hall-effect element or open internal circuit)
25%
Damaged, corroded, or disconnected wiring or connector for CMP sensor B
20%
Oil contamination in the CMP sensor B connector from leaking valve cover or cam cap gasket
10%
Damaged exhaust camshaft reluctor ring or target feature preventing signal generation
10%
ECM input circuit failure for the CMP sensor B channel
Diagnostic Steps
1
Verify CMP sensor B signal presence on live data while cranking — 'No Sync' or missing signal confirms total loss. Compare with CMP sensor A (intake cam) to isolate the fault to the exhaust cam circuit.
2
Inspect the CMP sensor B connector for oil contamination — on many DOHC engines, the exhaust cam sensor sits in an area prone to oil leaks from the valve cover gasket; oil intrusion is the most common cause of signal loss.
3
Measure voltage at the CMP sensor B connector with key on: verify 5V reference and ground are present and within spec. If the 5V reference is missing, check for other sensors on the shared reference circuit.
4
If power and ground are confirmed, check the signal wire for continuity between the sensor connector and the ECM — an open signal wire prevents signal transmission even with a working sensor.
5
Remove the CMP sensor B and inspect the sensing tip and the exhaust camshaft reluctor ring through the sensor bore for damage, debris, or excessive clearance.
6
If all electrical tests pass, install a known-good CMP sensor B and verify signal output while cranking.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The ECM is not receiving a valid signal from camshaft position sensor B on bank 1. On engines with dual overhead cams (DOHC), sensor B monitors the exhaust camshaft. This sensor is essential for proper sequential fuel injection timing and exhaust camshaft variable valve timing control. The driver ma...
The most common cause of P0365 (Camshaft Position Sensor "B" Circuit (Bank 1)) is: Failed camshaft position sensor B (dead Hall-effect element or open internal circuit)
Typical repair costs for P0365 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If the engine starts and runs in degraded mode, drive only short distances to a repair shop. The engine will run with reduced efficiency and the exhaust VVT system will be disabled. If the engine does not start or stalls, do not drive. Some vehicles will not start at all without the CMP B signal.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0365 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
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