What Does P1284 Mean?
The powertrain control module has detected an abnormally low voltage signal from the air-assisted injection valve solenoid control circuit on bank 1. This system uses compressed air to assist fuel atomization in certain engine designs.
Common Causes
35%
Wiring short to ground in solenoid control circuit
30%
Failed air injection switching solenoid
20%
Damaged or corroded connector pins at solenoid
15%
PCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Inspect wiring harness and connectors at air injection solenoid for damage, corrosion, or moisture
2
Step 2: Disconnect solenoid connector and measure resistance of solenoid coil (typically 10-50 ohms)
3
Step 3: Check for short to ground in control circuit wiring using multimeter
4
Step 4: Perform voltage drop test on ground circuit with solenoid activated
5
Step 5: If all circuits test normal, suspect PCM driver circuit failure
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The powertrain control module has detected an abnormally low voltage signal from the air-assisted injection valve solenoid control circuit on bank 1. This system uses compressed air to assist fuel atomization in certain engine designs.
The most common cause of P1284 (Switching Solenoid for Air Assisted Injection Valves Bank 1 Control Circuit Signal Low) is: Wiring short to ground in solenoid control circuit
Typical repair costs for P1284 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is generally safe to drive but may experience reduced performance, rough idle, or increased emissions. Address 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 P1284 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Fuel Injection / Air-Assist System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
