57 Boost Control Solenoid Circuit Fault

How to read it

Code 57 reads as 5 flashes, pause, 7 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 57 mean?

57. Boost Control Solenoid Circuit Fault. This code sets when your vehicle computer detects boost control solenoid circuit fault.

Common causes of 57

• Failed boost control solenoid
• Disconnected or cracked vacuum hoses to the solenoid
• Open or shorted solenoid wiring
• Faulty ECM boost output

How to fix 57

1. Read codes with a paperclip jumper across ALDL terminals A and B
2. Inspect wastegate hoses and solenoid vacuum lines for leaks
3. Test the solenoid coil resistance and check it clicks with power
4. Check wiring from the solenoid back to the ECM
5. Replace the solenoid if it fails tests then retest boost
6. Check the ECM output only after wiring tests clean