Code Definition

P1104 — MAF Ground Malfunction

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

About P1104

P1104 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

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.

P1104 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 P1104 fault code is indicative of a malfunction related to the ground circuit of the Mass Air Flow (MAF) sensor. This code is set when the Powertrain Control Module (PCM) detects an issue with the ground connection for the MAF sensor. A proper ground is crucial for the MAF sensor to function correctly, as it ensures accurate measurement of the air mass entering the engine. An issue with the ground circuit can lead to erroneous MAF sensor readings, impacting engine performance, fuel efficiency, and emissions.

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