What does code P1187 mean?

Q: What does code P1187 mean?

EOT Sensor Circuit Low Voltage. P1187 on Chrysler vehicles means the Engine Control Module (ECM) has detected a low-voltage condition on the Engine Oil Temperature (EOT) sensor circuit, which typically indicates a short to ground or an open circuit in the sensor wiring. The ECM expects a voltage signal between roughly 0.5 and 4.5 volts, and a reading below the calibrated threshold triggers this code. This is a circuit fault, not a direct oil pressure or oil level warning.

DTC codes / Chrysler codes / P1187

P1187 · ChryslerEOT Sensor Circuit Low Voltage

P1187 on Chrysler vehicles means the Engine Control Module (ECM) has detected a low-voltage condition on the Engine Oil Temperature (EOT) sensor circuit, which typically indicates a short to ground or an open circuit in the sensor wiring. The ECM expects a voltage signal between roughly 0.5 and 4.5 volts, and a reading below the calibrated threshold triggers this code. This is a circuit fault, not a direct oil pressure or oil level warning.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.