P1143: Air Assist Control Valve Range/Performance

What does P1143 mean?

P1143 is a diagnostic trouble code indicating "Air Assist Control Valve Range/Performance". The sensor or component is providing readings, but they fall outside the expected operating range. The part may be degraded, contaminated, or experiencing intermittent issues affecting engine/powertrain performance.

Common causes

• Worn or contaminated engine/powertrain component
• Vacuum leak or intake air leak
• Clogged filter or restricted flow
• Intermittent electrical connection issue

What should you do?

Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.

Get a diagnosis for YOUR car

Code P1143 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.

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