What Does P1289 Mean?
The PCM has detected an abnormally high voltage signal from the air-assisted injection valve solenoid control circuit on bank 2. This indicates an open circuit or loss of ground in the control system.
Common Causes
35%
Open circuit in solenoid control wiring or connector
30%
Failed air injection switching solenoid with internal open
20%
Poor or broken ground connection
15%
Damaged or loose connector terminals
Diagnostic Steps
1
Step 1: Inspect connector at solenoid for loose, corroded, or pushed-back pins
2
Step 2: Measure solenoid coil resistance with connector disconnected
3
Step 3: Test continuity of control circuit from PCM to solenoid
4
Step 4: Verify ground circuit integrity with resistance and voltage drop tests
5
Step 5: Check for proper control signal from PCM during commanded activation
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally high voltage signal from the air-assisted injection valve solenoid control circuit on bank 2. This indicates an open circuit or loss of ground in the control system.
The most common cause of P1289 (Switching Solenoid for Air Assisted Injection Valves Bank 2 Control Circuit Signal High) is: Open circuit in solenoid control wiring or connector
Typical repair costs for P1289 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience reduced performance, rough idle, or increased emissions. Repair within a few days.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1289 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection / Air-Assist System
Difficulty
Type
Manufacturer
Recommended Tools
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