P0497 on a 2022 Toyota Highlander
EVAP Low Purge Flow
P0497 on a 2022 Toyota Highlander indicates evap low purge flow. It usually stays drivable short-term but should be diagnosed promptly. The most common cause is failed purge valve stuck closed (mechanical or coil failure) (typically $80–$300). Confirm the root cause before replacing parts.
What does P0497 mean on a 2022 Toyota Highlander?
P0497 is the inverse of P0496. The ECM commands the EVAP purge valve to flow vapor from the canister into the intake during a monitor test, and detects less flow than expected — or none at all. The cause is either the purge valve stuck closed, a restricted hose between the canister and the intake, a clogged charcoal canister, or the purge valve electrical circuit failing open.
This guide covers P0497 across the 2020-2024 Toyota Highlander generation — the symptoms, causes, and diagnostic steps below apply to every model year from 2020 through 2024.
Is it safe to drive a 2022 Toyota Highlander with P0497?
In most cases a 2022 Toyota Highlander stays drivable for short trips with P0497 active, but diagnose and repair it promptly. This is a low-severity code — ignoring it can lead to further damage or a failed emissions test.
What are the symptoms of P0497 on a 2022 Toyota Highlander?
- Check Engine Light is illuminated
- Vehicle will fail emissions / smog testing
- Rarely any drivability symptom
- Possible faint fuel smell from a saturated canister
- Difficulty fueling at the pump (gas pump clicks off repeatedly)
What causes P0497 on a 2022 Toyota Highlander?
| Cause | Likelihood | Estimated repair (USD) |
|---|---|---|
| Failed purge valve stuck closed (mechanical or coil failure) | Most common | $80–$300 |
| Restricted or pinched hose between canister and purge valve | Common | $20–$150 |
| Wiring open on the purge valve circuit | Common | $80–$350 |
| Blocked or saturated EVAP charcoal canister | Occasional | $200–$600 |
| Failed PCM driver for the purge valve circuit | Rare | $400–$1,500 |
| Damaged or clogged EVAP service port creating a false low-flow reading | Rare | $30–$150 |
How to diagnose this on a 2022 Toyota Highlander
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Bench-test the purge valve
Remove the purge valve and apply 12 V. The valve should click audibly open. With voltage applied, blow air through the valve — air should pass freely. Without voltage, the valve should seal. A valve that does not open when commanded is the textbook P0497 cause.
Tools: 12 V test source, Hand vacuum / pressure pump
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Verify the purge valve receives voltage during commanded operation
Use a bidirectional scan tool to command the purge valve open while back-probing the connector. Battery voltage should appear on the power wire when commanded. No voltage = open circuit, blown fuse, or PCM driver fault.
Tools: Bidirectional scan tool, Multimeter, Back-probe pins
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Inspect the purge line for kinks or blockage
Trace the rubber line from the canister to the purge valve to the intake. Look for pinched sections (especially where the line passes under brackets), collapsed inner walls (common on aged rubber), or visible damage. A blocked line sets P0497 even with a perfect valve.
Tools: Flashlight, Inspection mirror
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Test the charcoal canister
Disconnect the purge-side hose from the canister and try to pull vacuum on it with a hand pump. A healthy canister allows some airflow; a saturated canister blocks airflow entirely. If the canister won't pass air, replace it.
Tools: Hand vacuum pump
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Read mode 6 EVAP test results
Mode 6 shows the measured purge flow during the most recent monitor run. Zero or very low flow confirms the diagnosis. A threshold-failure (just below acceptable) with a working valve points more at canister or hose restriction.
Tools: Scan tool with mode 6 support
NHTSA complaints & recalls for the 2022 Toyota Highlander
Owner-reported safety complaints and official recalls filed with the U.S. National Highway Traffic Safety Administration for the 2022 Toyota Highlander. Use these to gauge how common a problem is on your specific vehicle before you start chasing Toyota Highlander diagnostics.
- POWER TRAIN 36
- STRUCTURE 39
- SERVICE BRAKES 35
- UNKNOWN OR OTHER 30
- AIR BAGS 21
5 active recalls
- EQUIPMENT:OTHER:LABELS May 2022
Gulf States Toyota, Inc. (GST) is recalling certain 2022 4Runner, Tacoma, Highlander, and Highlander Hybrid vehicles. The load carrying capacity modification labels may not be permanent and can fade, becoming illegible. As such, these vehicles fail to comply with the requiremen…
NHTSA campaign 22V310000 - STRUCTURE:BODY:BUMPERS Oct 2023
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2020-2023 Highlander & Highlander Hybrid vehicles. During normal vehicle operation, minor impact to the front lower bumper cover may result in the cover coming loose or detaching.…
NHTSA campaign 23V720000 - TIRES Jun 2024
Gulf States Toyota, Inc. (GST) is recalling certain 2022-2024 model year Highlander L and Highlander LE vehicles equipped with the Blackout Package that includes 20" black alloy wheels and tires. The installed tires have an insufficient load rating. As such, these vehicles fail…
NHTSA campaign 24V419000 - TIRES Jun 2024
Southeast Toyota Distributors, LLC (SET) is recalling certain 2021-2024 Highlander vehicles. The 20-inch accessory tires with an insufficient load rating for the vehicle's Gross Axle Weight Rating (GAWR) were installed. As such, these vehicles fail to comply with the requiremen…
NHTSA campaign 24V452000
How do I fix P0497 on a 2022 Toyota Highlander?
- Replace the EVAP purge valve / purge solenoid
- Repair pinched or collapsed EVAP hose
- Replace the EVAP charcoal canister if saturated
- Repair open or broken purge valve wiring
About the 2020-2024 Toyota Highlander
The 2020-2024 Toyota Highlander was commonly sold with the following powertrains: 3.5L V6, 2.4L Turbo I4, 2.5L Hybrid I4. Common trims include L, LE, XLE, XSE, Limited, Platinum.
P0497 vs P0496
These are the two opposite EVAP purge flow failures:
- P0496 — high purge flow / valve stuck open. Vapor flows into the intake when it shouldn’t. Often causes rough idle.
- P0497 — low purge flow / valve stuck closed. Vapor cannot reach the intake to be burned. The canister gradually saturates, fuel pump can have trouble refueling because the tank can’t vent through the purge path.
Both codes can come from the same physical part — purge valves fail open or closed about equally. Don’t assume the valve diagnoses to one direction over the other.
The “tank doesn’t vent on refuel” symptom
If P0497 sets and the gas pump keeps clicking off during refueling, the EVAP system can’t vent the displaced air from the tank through its normal path. This is mostly a refueling annoyance — it doesn’t affect drivability. But it’s a strong diagnostic clue when present.
Restricted hoses on aged rubber
EVAP hoses, especially the small-diameter rubber sections between the canister and the purge valve, harden and shrink over 10+ years. The inner wall can delaminate and partially block flow even when the outer hose looks fine. If P0497 returns after a valve replacement, swap the hose too — they aged at the same rate.