Error Code P1250 is defined as Turbocharger System Malfunction. This means there’s an ongoing problem in the vehicle’s turbocharger system.

This code is a generic trouble code, meaning it applies to all vehicles equipped with OBD-II system or vehicles made since 1996 up to present. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model to another.

Definition

Turbocharger system work by increasing the power and efficiency of the vehicle. Vehicles equipped with turbocharger system that will have this trouble code means the turbocharger system is not functioning as it should. This is because the error means there is an over boost issue going on or the opposite problem is occurring.

Problems with the turbocharger system cause the vehicle to lose power and acceleration. The code prompts by a malfunction and stored in the vehicle’s PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) and triggers the Check Engine light on the dashboard.

Common Symptoms

For the symptoms, the Check Engine light on the dashboard is triggered, along with the registry of the Error Code. Other symptoms include:

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  • Loss of power
  • Poor acceleration
  • Excessive exhaust gas temperature leading to smoking exhaust
  • Loud whining noise in the turbocharger

Possible Causes

There are plenty of reasons for this error code to arise, some of the most common causes include:

  • Defective vacuum sensing valve
  • Defective SCV valve
  • Fault in the wiring that leads to the system
  • The turbo wastegate actuator is stuck

How to Check

Diagnosing the exact problem when there is a turbocharger system malfunction can be tricky. That is why before tackling the culprits of the problem, technicians usually starts their diagnosis by checking the all of the wirings around the system for any signs of damage. The easiest issue to start with the wastegate actuator, which can be assessed and serviced by unbolting it and making sure the linkage moves freely, and the system is lubricated properly.

Also, the vacuum sensing valve can throw the system off and cause the PCM to be confused about the regulating system; the same thing can happen with the SCV valve issues.

How to Fix

Repairs for this error code are pretty simple and straightforward, which of course, can only be derived through proper diagnosis. Some of the common repairs include:

  • Repair or replacement of the faulty vacuum sensing valve
  • Repair or replacement of the faulty SCV valve
  • Repair or replacement of the wiring system that leads to the turbocharger system
  • Repair or replacement of the stuck turbo wastegate actuator

It is important to get your vehicle’s turbocharger system checked as soon as possible when the Error Code P1250 is registered on your vehicle. Because the longer you leave the problem, the worse and more expensive the problem will get.

Should you want to diagnose your vehicle yourself, start by checking the exhaust system, air filter, breather system and fuel system on your vehicle, as problems on these components may cause similar symptoms as turbo failure.

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Also, check for turbo housing at the exhaust for cracks and leaks that may affect the turbo’s performance.