Servo Motor Potentiometer Airintake Right Circuit Failure
The right air intake servo motor's position sensor is sending an invalid signal to the engine computer, like a broken volume knob that won't report where it's set. This prevents the engine from adjusting air intake properly.
The ECM monitors the potentiometer voltage from the right air intake servo motor to verify proper positioning. The sensor should produce a linear voltage signal between 0.5V and 4.5V as the motor moves through its range. If the voltage falls outside expected parameters or shows no change, the ECM triggers a circuit failure fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Voltage | 0.5V to 4.5V (linear sweep) | Below 0.2V or above 4.8V, or no signal variation |
| Motor Response Time | Voltage changes within 2 seconds of command | No voltage change or delayed response beyond threshold |
Code B1288 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B1288 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.