Code Definition

P1194 — ECU A/D Converter

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

About P1194

P1194 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.

P1194 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 Analog to Digital (A/D) converter is an internal circuit within the Engine Control Unit that converts the analog voltage signals from sensors such as temperature, pressure, and position sensors into digital values the processor can interpret. DTC P1194 is set when the ECU detects that this internal A/D conversion process has produced implausible results or has failed an internal self test during its monitoring routine. Because the converter relies on a stable reference voltage and clean power and ground, unstable supply conditions or a dragged down reference voltage can trigger this code e...

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