What does it mean?
P1289 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Turbocharger Bypass Valve Short to Ground .
Symptoms
- MIL (check engine lamp) on
- Low or no boost, sluggish acceleration and poor drivability
- Bypass valve stuck open, with an audible hiss or air leak sound under load
- Engine dips or stalls when the throttle is closed quickly
- Repeated fuse failures if the circuit is protected by its own fuse
Likely causes
- Control wire pinched or chafed against the engine block, a bracket or body metal
- Solenoid winding shorted internally to the valve body
- Water, coolant or road salt in the valve connector
- Broken harness clip letting the wire rest on a hot or sharp surface
- Corroded terminal bridging the control pin to a ground or shield pin
- Control module driver failed in the shorted state, checked last
How to fix it
- Read the freeze frame and note load and boost when the fault set
- Command the valve with the scan tool and watch whether the actual boost reacts
- Unplug the valve, key on, and test the control wire for continuity to ground
- Measure solenoid resistance and check for continuity between the winding and the valve body
- Wiggle-test the harness along its whole route while monitoring the code status
- Repair the pinch or chafe point and re-secure the harness in its clips; replace the valve if it is internally shorted
- Clear codes and verify boost control on a road test