Wastegate Failure
The P1690 code indicates a malfunction in the turbocharger wastegate control system. The wastegate regulates boost pressure by diverting exhaust gases away from the turbine. When it fails, the engine may experience overboost or underboost, leading to reduced performance, increased emissions, and potential engine damage. Common causes include a stuck or broken wastegate valve, faulty boost control solenoid, vacuum leaks, or wiring issues.
01. Most Common Causes
- Stuck or seized wastegate valve
- Faulty boost control solenoid
- Vacuum or boost leak
- Damaged wiring or connectors
02. Symptoms You Will Notice
- Check Engine Light on
- Loss of power or sluggish acceleration
- Overboost or underboost condition
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and check freeze frame data.
Step 2: Inspect wastegate actuator rod for movement and vacuum lines for leaks.
Step 3: Test boost control solenoid with a multimeter or scan tool.
Step 4: Check wiring and connectors for damage or corrosion.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a wastegate failure can cause engine damage due to uncontrolled boost pressure.
How much does it cost to fix?▼
Repair costs range from $150 to $500 depending on the cause and labor rates.