P0340 on a 2022 Toyota Camry
Camshaft Position Sensor Circuit Fault
What does P0340 mean on a 2022 Toyota Camry?
P0340 is set when the engine control module cannot interpret the camshaft position sensor signal on the primary cam (or the single cam on engines with one sensor). The signal might be missing entirely, out of phase with the crankshaft signal, or showing electrical noise. Because the ECM uses cam position to time fuel injection and ignition, a P0340 will typically cause a hard start, a no-start, or a stall.
Symptoms on a 2022 Toyota Camry
- Check Engine Light is illuminated
- Hard cranking or extended crank time before the engine starts
- Intermittent stalling, especially when the engine is hot
- Engine cuts out and restarts after a short delay
- Possible complete no-start condition
- Rough running and reduced power if the engine does run
Likely causes on a 2022 Toyota Camry
- Failed camshaft position sensor (most common after 100k miles) Most commonEstimated repair: $100– $400
- Damaged or corroded sensor connector CommonEstimated repair: $50– $250
- Chafed or broken sensor wiring CommonEstimated repair: $80– $350
- Loose, slipped, or worn camshaft sensor reluctor wheel OccasionalEstimated repair: $300– $1,200
- Timing chain stretch causing cam-crank correlation drift OccasionalEstimated repair: $800– $3,000
- Failed PCM driver for the cam sensor input (rare) RareEstimated repair: $400– $1,500
How to diagnose this on a 2022 Toyota Camry
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Inspect the connector and wiring at the cam sensor
Locate the cam sensor (usually near the front of the cylinder head, threaded into the head or timing cover). Disconnect the sensor and inspect the connector for corrosion, bent pins, or water intrusion. Inspect the harness for chafing against engine mounts or accessory brackets.
Tools: Connector unlock tool, Flashlight, Electrical contact cleaner
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Test the sensor signal with a scope or scan tool
With the engine cranking or running, the cam sensor should produce a square-wave or sine-wave signal that the scan tool can graph. No signal or a noisy signal indicates the sensor or its wiring is bad. A clean signal that the ECM does not respond to suggests an ECM input fault.
Tools: Scan tool with cam sensor PID, or oscilloscope, Multimeter
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Verify cam-crank correlation in live data
Watch the cam and crank position signals together while cranking. They should maintain a fixed timing relationship. If the cam signal drifts relative to the crank signal over time, suspect timing chain stretch or a slipped reluctor wheel.
Tools: Scan tool with dual-PID graphing
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Check sensor power and ground at the connector
With the connector unplugged and the key on, verify battery voltage on the power wire and continuity from the ground wire to a known good chassis ground. Missing power or poor ground will produce P0340 with a perfectly good sensor.
Tools: Multimeter, Wiring diagram
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Inspect the reluctor / target wheel on the camshaft
If the wiring tests good and the sensor is new but P0340 persists, remove the sensor and shine a light at the reluctor wheel through the sensor port. Damaged or oil-fouled teeth will not generate a clean signal. On some engines the reluctor is a separate pressed-on piece that can slip.
Tools: Inspection mirror, Bright flashlight
Known Technical Service Bulletins for the 2020-2024 Toyota Camry
Manufacturers publish Technical Service Bulletins (TSBs) when a known issue affects a specific vehicle. These bulletins come from the NHTSA database for your Toyota Camry.
- ENGINE Feb 26, 2026
OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.
NHTSA #11029896 - ELECTRICAL SYSTEM Jan 29, 2026
OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T-SB-0001-26.
NHTSA #11028726 - ELECTRICAL SYSTEM Jan 27, 2026
Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software.
NHTSA #11028722 - UNKNOWN OR OTHER Jan 6, 2026
Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle for odor remediation. Refer to the applicable model and model year Repair Manual and the EPA (Environmental Protection Agency) website for the most up-to-date safety and precautionary guidelines.
NHTSA #11028712 - ENGINE Aug 6, 2025
The specific condition covered by this program is for a small engine coolant leak that can occur from the flow shut-off valve that can allow coolant to drip on other parts of the vehicle. This can cause "Engine Maintenance Required" to be displayed on the instrument cluster or cause the A/C not to function normally. Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’ ownership experience. Toyota is providing coverage for repairs related to Flow Shut-off Valve Coolant Leak.
NHTSA #11022949 - ELECTRICAL SYSTEM Jun 24, 2025
Some 2021 – 2022 model year Avalon, 2018 – 2024 Camry, 2019 – 2025 model year Corolla, 2022 – 2025 model year Corolla Cross, and 2019 – 2025 model year RAV4 vehicles with A25A-FKS and M20A-FKS engines may have a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs) upon cold soak start up with engine coolant temperatures between 14°F – 41°F: •P030027 – Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold •P030000 – Random/Multiple Cylinder Misfire Detected •P030100 – Cylinder 1 Misfire Detected •P030200 – Cylinder 2 Misfire Detected •P030300 – Cylinder 3 Misfire Detected •P030400 – Cylinder 4 Misfire Detected
NHTSA #11020670
+14 more TSBs available in MECH AI's TSB explorer for this vehicle.
Common fixes
- Replace the camshaft position sensor with an OEM part
- Repair the sensor connector or harness
- Replace the slipped or damaged reluctor wheel
- Replace stretched timing chains and guides (if cam-crank correlation drifts)
About the 2020-2024 Toyota Camry
The 2020-2024 Toyota Camry was commonly sold with the following powertrains: 2.5L I4, 3.5L V6, 2.5L Hybrid I4. Common trims include LE, SE, XLE, XSE.
Why P0340 sometimes causes a no-start
The ECM uses the cam sensor to decide which cylinder is approaching top-dead-center on the compression stroke vs. the exhaust stroke. With no cam signal, the ECM cannot synchronize the injectors to the right cylinder, and on many engines it defaults to a fail-safe mode that disables fuel injection. The engine will crank but not fire.
Some engines (notably modern Ford and GM) have a “limp” mode that uses the crank signal alone and runs the engine in batch fire (all injectors firing together) — these vehicles will run, but poorly, without a cam signal.
Cam sensor vs. timing chain
A new cam sensor is $30–$150 and a 15-minute install on most engines. Timing chain replacement is $800–$3,000. Before condemning the chain, always test the new sensor first. The exception: on engines with documented timing chain stretch issues (BMW N20, VW EA888 1st gen, GM 3.6 LFX/LLT, Nissan VQ35 with stretched chain) and high mileage, cam-crank correlation drift in the live data should be inspected before installing a new cam sensor.
Heat-soak intermittent stalling
A failing cam sensor often works correctly when cold and fails after extended driving. The pattern is: drive 30 minutes, stop for gas, restart and the engine stalls or cranks for 10+ seconds before catching. If P0340 is intermittent and correlates with engine heat, replace the sensor preemptively — the failure mode worsens until eventually the vehicle will not start at all.