What Does P0027 Mean?
P0027 indicates that the exhaust valve control solenoid circuit on Bank 1 is operating outside its expected range or not performing correctly. The ECM has detected that the solenoid controlling exhaust valve timing or lift is not responding within the expected parameters. This affects the exhaust side of the variable valve mechanism, potentially reducing exhaust scavenging efficiency and performance. Symptoms include reduced power, slight rough idle, and the check engine light.
Common Causes
30%
Exhaust valve control solenoid degraded or partially stuck, not responding correctly to ECM duty cycle commands
25%
Wiring issue in the exhaust valve control solenoid circuit causing intermittent or high-resistance connection
20%
Contaminated engine oil restricting hydraulic flow to the exhaust valve control actuator
15%
Mechanical wear in the exhaust variable valve mechanism preventing proper actuator travel or response
10%
ECM driver circuit providing inconsistent output to the exhaust valve control solenoid
Diagnostic Steps
1
Monitor the exhaust valve control solenoid duty cycle and actuator position feedback in live data — verify smooth, proportional response across the full command range.
2
Measure the exhaust valve control solenoid coil resistance and compare to spec — typical range is 6-13 ohms depending on manufacturer.
3
Remove and inspect the solenoid for contamination, sludge buildup on the screen filter, and physical damage to the plunger or housing.
4
Check engine oil level and verify the correct viscosity oil is installed. Perform an oil change if overdue, as degraded oil is the leading cause of VVT actuator performance issues.
5
Use a bidirectional scan tool to sweep the solenoid duty cycle and monitor the exhaust valve position response — any dead zones, sticking, or non-linear response indicates a mechanical or hydraulic fault.
6
Inspect the solenoid connector and wiring for oil intrusion, heat damage, or chafed insulation near exhaust components.
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
P0027 indicates that the exhaust valve control solenoid circuit on Bank 1 is operating outside its expected range or not performing correctly. The ECM has detected that the solenoid controlling exhaust valve timing or lift is not responding within the expected parameters. This affects the exhaust si...
The most common cause of P0027 (Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)) is: Exhaust valve control solenoid degraded or partially stuck, not responding correctly to ECM duty cycle commands
Typical repair costs for P0027 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive with minor performance degradation. The exhaust valve system will default to a base position, maintaining engine operability. Schedule repair within a few weeks to prevent accelerated wear on the variable valve mechanism.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0027 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing (VVT)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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