Exhaust Valve Control solenoid Circuit Range/Performance Bank 1
Code P0027 means the exhaust valve control solenoid on Bank 1 is not performing within the expected range. The solenoid receives proper commands but the resulting cam timing behavior is outside acceptable limits. This is the exhaust cam performance counterpart to P0026. Common causes are the same — low or dirty oil, a sluggish solenoid, or a worn phaser — all focused on the Bank 1 exhaust cam.
What You Might Notice
- Check engine light on
- Rough idle
- Reduced power
- Poor fuel economy
- May be stored alongside P0026 or other VVT codes
Most Common Causes
- 1
Low or dirty engine oil
Insufficient clean oil pressure causes the Bank 1 exhaust VVT system to operate outside its performance range.
- 2
Stuck or sluggish Bank 1 exhaust VVT solenoid
Sludge on the solenoid plunger slows valve movement, causing out-of-range cam performance.
- 3
Clogged solenoid oil screen (Bank 1 exhaust)
Debris in the solenoid screen restricts oil flow without triggering a circuit fault code.
- 4
Worn Bank 1 exhaust cam phaser
A worn phaser cannot maintain commanded timing positions, causing performance errors.
How to Diagnose It
- 1
Check Low or dirty engine oil — Insufficient clean oil pressure causes the Bank 1 exhaust VVT system to operate outside its performance range.
- 2
Check Stuck or sluggish Bank 1 exhaust VVT solenoid — Sludge on the solenoid plunger slows valve movement, causing out-of-range cam performance.
- 3
Check Clogged solenoid oil screen (Bank 1 exhaust) — Debris in the solenoid screen restricts oil flow without triggering a circuit fault code.
- 4
Check Worn Bank 1 exhaust cam phaser — A worn phaser cannot maintain commanded timing positions, causing performance errors.
How to Fix It
- 1
- 2
Clean the Bank 1 exhaust VVT solenoid screen
Remove, clean screen, reinstall. Recheck after a drive cycle.
- 3
Test solenoid plunger operation
Verify the plunger moves freely. Replace if sluggish.
- 4
Inspect Bank 1 exhaust cam phaser
Monitor cam position live data and replace phaser if worn.
- 5
Clear and verify
Clear codes and confirm resolution after a full drive cycle.
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