Code Definition

P1143 — Load calculation too high

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About P1143

P1143 is a manufacturer-specific powertrain diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1143 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1143 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Engine Control Module (ECM) calculates engine load primarily from the mass air flow sensor, supported by the throttle angle and engine speed model, and uses this value to set fuelling and ignition. DTC P1143 is stored when the calculated load value rises above the plausible maximum for the operating conditions. This usually means the air flow signal is reading too high, the throttle and load signals do not agree, or on a forced induction engine the boost is higher than expected. When this code is active the driver may notice rich running, poor fuel economy, surging, or the engine may defau...

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