P256300 Fault code

[Ross Richardson]

Hi, i have recently been running my car for around with an engine management light on and glow plug light flashing, which when ran on a diagnostics came back as;

P256300 -Charge pressure actuator position sensor signal inprobable.

P256400 -Charge pressure actuator position sensor signal to small.
Im wondering if anyone’s had this problem before? Ive deleted the engine light but it comes back on a week after running the car with the glow plug light constantly flashing.
Thanks.