What Does P1223 Mean?
P1223 indicates an open circuit in the exhaust valve solenoid(s) used for cylinder deactivation. The ECM commanded the exhaust valve deactivation solenoid to actuate, but detected no current flow, indicating a broken wire, disconnected connector, or failed solenoid coil. The cylinder deactivation system will be disabled.
Common Causes
30%
Failed exhaust valve deactivation solenoid with open coil winding
25%
Disconnected or improperly seated solenoid connector
20%
Broken wire in the solenoid control circuit
15%
Corroded connector terminals creating an open circuit
10%
ECM output driver failure unable to supply current to the solenoid
Diagnostic Steps
1
Check for companion codes P1209, P1210, and P1221 that indicate additional cylinder deactivation system faults.
2
Inspect the exhaust valve deactivation solenoid connector for proper engagement, corrosion, and terminal condition. Ensure the connector is fully seated.
3
Measure the solenoid coil resistance. An infinite reading confirms an open coil. Compare to manufacturer specifications.
4
Test continuity of the wiring from the ECM output pin to the solenoid connector on both the control and ground/return wires.
5
Verify the ECM is commanding voltage to the solenoid output pin by back-probing the ECM connector while commanding the solenoid on via scan tool.
6
Replace the open solenoid or repair the broken wiring, clear codes, and perform a road test to verify cylinder deactivation engages properly.
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
P1223 indicates an open circuit in the exhaust valve solenoid(s) used for cylinder deactivation. The ECM commanded the exhaust valve deactivation solenoid to actuate, but detected no current flow, indicating a broken wire, disconnected connector, or failed solenoid coil. The cylinder deactivation sy...
The most common cause of P1223 (Cylinder shut-off exhaust valves Open circuit) is: Failed exhaust valve deactivation solenoid with open coil winding
Typical repair costs for P1223 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety impact. The engine will operate normally on all cylinders at all times, but fuel economy will be reduced because the cylinder deactivation system cannot engage during light-load cruising conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1223 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Cylinder Management / Cylinder Deactivation
Difficulty
Type
Manufacturer
Recommended Tools
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