P0365 Code: Camshaft Position Sensor B Circuit (Bank 1)
The exhaust cam sensor on bank 1 has lost its signal. Usually a heat-damaged sensor or connector.
At a glance
Severity: Low
- Meaning
- Camshaft Position Sensor B Circuit (Bank 1)
- System
- Ignition & Misfire · Powertrain
- Safe to drive?
- Yes, short term
- Typical repair cost
- $80–$380
- DIY difficulty
- Easy
Engines with variable timing on both camshafts need to know where each cam is, so they carry a second cam sensor. By the common convention, sensor A reads the intake cam and sensor B the exhaust cam; P0365 means the computer has lost, or can't use, the bank 1 exhaust cam signal. Because the crank sensor and the intake cam sensor already give the computer full engine synchronization, the engine normally starts and runs almost normally. What you lose is exhaust cam phasing, which the computer parks at its default position, costing a little torque, efficiency and emissions performance. The exhaust sensor sits on the hot side of the head, often just above the exhaust manifold or near the turbocharger, and heat is the main reason these sensors and their connectors fail.
Can I keep driving? Normally safe to drive. Expect a slightly softer response and a small drop in fuel economy. Plan the repair, but it isn't an emergency unless other cam or crank codes appear too.
How to read P0365
- P Powertrain
- 0 Generic (SAE)
- 3 Ignition / misfire
- 65 Specific fault
Symptoms
- Check-engine light with little or no change in how the car drives
- Slightly less low-end pull or a softer throttle response
- Small drop in fuel economy
- Occasionally a slightly rougher idle
- Brittle, cracked connector or discolored wiring near the exhaust side of the head
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Exhaust cam sensor failed from repeated heat cycles
- Heat-hardened, cracked connector or loose terminal near the exhaust manifold or turbo
- Wiring insulation baked or melted against a heat shield
- Oil seeping past the sensor O-ring into the connector
- Shared 5-volt reference or sensor ground fault
- Damaged exhaust cam target wheel
- Engine computer fault
Diagnosis step by step
Confirm which sensor is B
Check the service information for your engine; on most makes B is the exhaust cam on bank 1, but a few manufacturers label them differently. On inline engines both cam sensors are usually side by side at the timing end of the head, one per camshaft.
Tools: Flashlight
Inspect the connector for heat damage
Unplug the exhaust side sensor and look closely. A connector that has turned brown, lost its lock tab, or crumbles when flexed, and terminals that look dull or loose, are common failures on the hot side. Replace the pigtail if the plastic is brittle.
Tools: Flashlight, Screwdriver
Swap A and B if they are the same part
On many dual-VVT engines the intake and exhaust sensors are identical. Swap them, clear the codes and start the engine. If the fault becomes P0340, the sensor is bad; if P0365 returns, it's the wiring or connector on the exhaust side.
Tools: Screwdriver, OBD-II scanner
Measure supply, ground and signal
Key on, check for about 5 volts (or 12 on some engines) on the reference pin and a ground within 0.1 volt of battery negative. While cranking, the signal should switch between low and high. Compare with the intake sensor, which usually shares the same supply.
Tools: Multimeter
Replace and protect
Fit the new sensor with a new O-ring and route the harness away from the manifold, using heat-reflective sleeve where the original loom had cooked. Clear the code and confirm on the scan tool that the exhaust cam angle is reported and follows commands.
Tools: Torque wrench, OBD-II scanner
Where the parts are
- 1Ignition coil
- 2Spark plug
- 3Fuel injector
- 4Camshaft sensor
- 5Crankshaft sensor
- 6Engine computer (ECM)
- 7Intake manifold
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Replace exhaust camshaft position sensor | Yes | $90–$280 |
| Replace heat-damaged connector pigtail | No | $80–$250 |
| Repair cooked wiring and add heat sleeve | No | $120–$380 |
| Clean oil from connector and replace leaking sensor | Yes | $110–$300 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Notes by brand
Field data
| Ford | 8 | Escape, F-150 SUPERCAB, Ecosport | |
|---|---|---|---|
| Jeep | 3 | Compass, Wrangler | |
| Chevrolet | 2 | Malibu, Malibu Hybrid | |
| Dodge | 2 | Challenger, Journey |
Source: NHTSA Complaints API (US government open data), analyzed by DTC mention.
Emissions / smog test impact
Will fail
Even though the car drives almost normally, a stored P0365 with the check-engine light on fails a state OBD emissions test. After the repair, drive a few days so the monitors are ready before the test.
Frequently asked questions
Why does my engine run almost normally with P0365?
The crank sensor and the intake cam sensor already tell the computer everything it needs to fire the spark plugs and injectors in the right order. The exhaust cam sensor mainly serves the exhaust cam phaser. Without it, the computer parks the phaser and the engine loses only a little torque and efficiency.
Is sensor B always the exhaust cam?
On most makes, yes: A is intake and B is exhaust, with bank 1 being the side with cylinder 1. A few manufacturers use their own labels, so confirm with the service information before ordering a part.
Why do exhaust cam sensors fail more than intake ones?
They live on the hot side of the head, often right above the exhaust manifold or next to the turbo. Constant heat cycles harden the plastic, crack solder joints inside the sensor and make connectors brittle, which is why P0365 is often traced to heat damage.
Can I just swap in the intake sensor to test?
Only if both sensors are the same part with the same connector, which is common but not universal. If the code moves to the intake side after the swap, you've found a bad sensor for the price of a few minutes' work.