Code Definition

P1129 — Manifold Absolute Pressure (MAP) higher than expected

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

About P1129

P1129 is a manufacturer-specific powertrain diagnostic trouble code recorded for Acura vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1129 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.

P1129 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 Manifold Absolute Pressure (MAP) sensor measures intake manifold pressure and supplies that value to the Engine Control Module (ECM) as a voltage used to calculate engine load, fuel delivery, and ignition timing. DTC P1129 sets when the ECM detects the MAP signal reporting a manifold pressure significantly higher than expected for the current throttle position, engine speed, and load, meaning the sensor is indicating less vacuum than the engine should be producing. On Honda and Acura systems the MAP value is cross checked against throttle position and barometric pressure, and the code stor...

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