Code Definition

P1170 — ESO - Engine Shut Off Solenoid Fault

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

About P1170

P1170 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.

P1170 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 is set when the powertrain control module (PCM) detects a malfunction in the engine shut-off (ESO) solenoid circuit. The ESO solenoid is commonly used in diesel engines to control fuel supply shutdown when the engine is turned off. A failure in this solenoid or its circuit can cause issues with engine shutdown or prevent starting.

Quick Facts