Code Definition

P1187 — Variant selection

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

About P1187

P1187 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. 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.

P1187 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 applies to Ford diesel engines with the Lucas EPIC injection system, where the control module must know the correct engine and pump variant so it applies the right fuelling and timing calibration. DTC P1187 sets when the variant selection is missing, unrecognised, or incorrect, so the control module cannot confirm which calibration variant applies. This commonly occurs after an injection pump or control module has been replaced without the correct variant being coded, or when a variant coding input such as a resistor or configuration value is faulty. With the wrong or missing variant...

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