P0027
Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1
Variable valve timing
Generic OBD-II
High
What it means
P0027 means the exhaust camshaft (valve) control solenoid on bank 1 isn't performing within its expected range — the commanded valve timing and the actual result don't match. It's often a dirty or sticking solenoid or restricted oil flow rather than a broken wire. Expect rough running, slightly reduced power, and higher emissions until it's corrected.
High
Can I keep driving? Drivable, but keep it short — mistimed valves raise emissions and can worsen; start with oil condition and the control solenoid.
Common symptoms
What you'll notice
- Check-engine light on
- Rough idle
- Mild loss of power
- Higher emissions or a failed emissions test
- Reduced fuel economy
Common causes
Most likely first
- Dirty or sticking exhaust valve control (oil-control) solenoidLikely
- Dirty oil, clogged oil passages, or low oil pressureCommon
- Wiring or connector fault at the solenoidCommon
- Worn variable-cam-timing phaserLess often
- Failed ECM driver (rare)Less often
How to diagnose & fix
Work through it in order
- Check oil level and condition; change oil and filter with the correct grade.
- Scan and record freeze-frame data.
- Remove, test, and clean the exhaust valve control solenoid.
- Check the solenoid's wiring and resistance against spec.
- Inspect the oil passages and screen; replace the solenoid if it's faulty. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0027?+
Short trips are usually fine, but the exhaust cam timing is off, which raises emissions and can worsen. Have it checked before a long drive or an emissions test.
Can I just clear P0027?+
It returns unless the solenoid, oil flow, or wiring is corrected. This is a range/performance code, so start with oil condition and the control solenoid.
Related codes
Often seen with P0027
Read & clear P0027 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX