Lost Communication With Turbocharger Boost Control Module
The U0174 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Turbocharger Boost Control Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $1000 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Loss of turbo boost pressure
- Poor acceleration response
- Turbo wastegate not functioning properly
Probable Causes (Ranked by Likelihood)
- Failed boost control module Very High
- Damaged wiring to boost control solenoid High
- Corroded connector at turbo assembly Moderate
- Failed turbo wastegate actuator Moderate
Step-by-Step Diagnostic Procedure
-
Check boost pressure with a scan tool at idle and under load
-
Inspect wiring to the boost control solenoid and wastegate actuator
-
Verify power and ground at the boost control module
-
Check vacuum lines to the wastegate for leaks or disconnection
-
Inspect the turbo assembly for oil leaks or mechanical damage
Frequently Asked Questions
Can I drive with code U0174?
You can drive short distances but expect significantly reduced power. The engine will likely enter limp mode to protect the turbocharger.
What causes U0174?
Usually a failed boost control module or damaged wiring near the turbocharger. Heat and vibration in the engine bay can degrade connections over time.
Is U0174 expensive to fix?
Costs range from $200 for wiring repairs to $1000 for module or actuator replacement. Turbo-related repairs tend to be labor intensive.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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