Code Definition

P1263 — Cylinder #3 High To Low Side Short

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

About P1263

P1263 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.

When P1263 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; a signal or supply voltage lower than the expected operating range; and 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.

P1263 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 Powertrain Control Module (PCM) operates each fuel injector through a high side driver that supplies voltage and a low side driver that provides the path to ground. DTC P1263 sets when the PCM detects a short between the high side and low side of the cylinder 3 injector circuit, indicating an unintended low resistance path that allows current to flow when it should not. The PCM may shut down the affected injector driver to protect itself, and where injectors share a common driver bank the fault can influence more than one cylinder. Symptoms usually include a cylinder 3 misfire, rough idle,...

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