Code Definition

P1177 — Synchronisation Fault

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

About P1177

P1177 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.

P1177 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

This code sets when the powertrain control module (PCM) detects a synchronisation issue between the crankshaft and camshaft signals. Proper synchronisation is critical for accurate ignition timing and fuel injection. A loss of synchronisation can result in misfires, rough running, no-start conditions, or reduced performance.

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