Camshaft Position Sensor “B” Circuit Intermittent Bank 1

What P0369 means

Engines with variable valve timing on both camshafts carry two cam position sensors per bank: the 'A' (typically intake) sensor and the 'B' (typically exhaust) sensor. P0369 is set against the 'B' sensor on bank 1 — the side that houses cylinder 1. Each Hall-effect sensor reads a toothed target on its camshaft and sends the PCM a square-wave pulse that marks cam angle. The PCM compares that pattern with the crankshaft position signal to track exact valve timing and to command the variable-cam-timing oil-control valve. P0369 is the 'intermittent' member of the P0365-P0369 family: instead of a continuous open or short, the PCM logs brief dropouts, missing pulses or electrical noise on the bank-1 'B' circuit that come and go. The test typically fails when the module detects one or more of these erratic events over a monitoring window while the engine is running. Because the fault is intermittent, the code often stores while the sensor still tests good at the moment you check it, which is what makes it harder to pin down than a hard circuit fault.

Symptoms

• Check-engine light on, sometimes flickering on and off with the fault
• Intermittent stall or momentary stumble, especially at idle or light throttle
• Hard or extended cranking before the engine catches, or an occasional no-start
• Brief hesitation, surging or a rough spot as cam timing is corrected
• Reduced power or a 'limp' feel when the PCM defaults variable cam timing to a safe base position
• Slightly worse fuel economy or a faint exhaust smell during the event

Common causes

• Failing bank-1 'B' (exhaust) camshaft position sensor that drops out when hot or vibrated
• Loose, backed-out or corroded sensor connector terminals making momentary contact
• Chafed, pinched or heat-damaged wiring in the CMP harness causing an intermittent open or short
• Damaged sensor shielding or nearby electrical interference corrupting the signal
• Debris, metal shavings or oil sludge on the reluctor/target wheel, or an excessive sensor-to-target air gap
• Worn VVT/VCT phaser or cam-timing slack that makes the cam signal wander relative to the crank signal

Severity & driving advice

Severity: Moderate — Usually driveable, but an intermittent cam signal can cause sudden stalls or a no-start, so diagnose it before relying on the vehicle.

Can I drive? Short trips OK; risk of stalling — fix soon.

Diagnostic approach

1. Confirm the code and capture freeze-frame — Read all stored codes and note the freeze-frame conditions (rpm, coolant temp, load) that were present when P0369 set. Look for companion cam or crank codes (P0365-P0368, P0340-P0344, or crank P0335/P0336) that point to a shared harness or timing problem rather than a lone sensor. Because P0369 is intermittent, plan to test with the harness disturbed, not just at rest.
2. Inspect the sensor, connector and reluctor — Unplug the bank-1 'B' CMP sensor and check for oil intrusion, spread or corroded pins, and a loose lock. Pull the sensor and inspect the tip and the camshaft target wheel for metal debris, damage or an out-of-spec air gap. Reseat and, if the connector is loose, gently tension the terminals — a large share of intermittent CMP faults are connection, not sensor, related.
3. Check power, ground and signal — With the key on, back-probe the three-wire connector: confirm a steady reference feed (about 5 V, or battery voltage on some designs) and a clean ground under 0.1 V drop. Most modern CMP sensors are Hall-effect and have no meaningful resistance across the terminals, so do not condemn one on an ohm reading; older two-wire variable-reluctance types read roughly 200-900 ohms. A failed feed or ground on a shared circuit can drop the signal intermittently.
4. Scope the signal and wiggle-test — Back-probe the signal wire with a graphing meter or scope and crank/run the engine: a good Hall sensor gives a crisp square wave switching between near 0 V and roughly 5 V (or the pull-up voltage) once per cam event, with no missing or ragged pulses. While watching the trace, wiggle the harness and flex the connector, and warm the engine to reproduce the fault — a dropout or spike during the wiggle localizes the bad spot. Compare bank-1 'B' timing against the crank signal for correlation.
5. Repair and verify — Replace the sensor, repair the chafed/corroded harness section, or re-terminate the connector as the tests indicate, and restore correct routing and shielding. Clear the code, then road-test through the freeze-frame conditions and several heat cycles to confirm P0369 does not return. If the cam signal still wanders with good wiring, inspect the VVT phaser and timing chain for wear.

Make & model notes

Ford: On dual-VVT V6/V8 engines (e.g. the 5.0L 'Coyote' V8) the bank-1 'B' sensor is the exhaust-cam sensor on the cylinder-1 side. Ford's own data treats P0369 like its 'A'-sensor sibling: the PCM sets it on an intermittent CMP signal, and lists intermittent open/short circuits, damaged sensor shielding, poor harness connections and corrosion as the likely causes, with harness routing and electrical interference as key diagnostic aids.

Toyota: Toyota labels the sensor VVT/OCV-related; on engines with dual VVT-i the bank-1 exhaust-cam sensor feeds cam timing to the ECM. Check the sensor connector and the exhaust-cam oil-control-valve wiring, and confirm oil is clean and at level, since low or dirty oil upsets cam-timing correlation and can mimic an intermittent sensor fault.

Jeep / Stellantis: On Chrysler-group engines such as the 3.6L Pentastar, cam sensor issues frequently trace to connector corrosion or oil wicking up the harness into the sensor. Inspect for oil intrusion at the connector and verify the target/tone wheel is clean before replacing the sensor for an intermittent bank-1 'B' fault.

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