| Engine Code | Engine Code Description |
|---|---|
| P1506 | Idle Air Control Overspeed Error |
| P1507 | Idle Air Control Underspeed Error |
| P1508 | Idle Control System Circuit Open |
| P1509 | Idle Control System Circuit Shorted |
| P1510 | Idle Signal Circuit Malfunction |
| P1511 | Idle Switch (Electric Control Throttle) Circuit Malfunction |
| P1512 | Intake Manifold Runner Control (Bank 1) Stuck Closed |
| P1513 | Intake Manifold Runner Control (Bank 2) Stuck Closed |
| P1514 | High Load Neutral/Drive Fault |
| P1515 | Electric Current Circuit Malfunction |
| P1516 | IMRC Input Error (Bank 1) |
| P1517 | IMRC Input Error (Bank 2) |
| P1518 | Intake Manifold Runner Control (Stuck Open) |
| P1519 | Intake Manifold Runner Control (Stuck Closed) |
| P1520 | Intake Manifold Runner Control Circuit Malfunction |
| P1521 | Variable Intake Solenoid #1 Circuit Malfunction |
| P1522 | Variable Intake Solenoid #2 Circuit Malfunction |
| P1523 | IVC Solenoid Circuit Malfunction |
| P1524 | Variable Intake Solenoid System |
| P1525 | Air Bypass Valve System |
| P1526 | Air Bypass System |
| P1527 | Accelerate Warmup Solenoid Circuit Malfunction |
| P1528 | Subsidiary Throttle Valve Solenoid Circuit Malfunction |