Powertrain, generic (extended)

P2183 Engine Coolant Temperature Sensor 2 Circuit Range/Performance

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P2183 means sensor 2 delivers a voltage inside the valid band, yet the temperature does not fit the other readings. Most makers test this after a long cold soak, when all temperatures should match. The VW Touareg with engine CNRB sets it when the radiator outlet sensor differs by more than 35 K from intake air, ambient or fuel temperature at start-up. RAM 1500 models with the rear axle heater compare that loop with engine coolant and oil after 8 hours and allow 30 °C; a block heater can trip it falsely. Ford reflashes Escape and Corsair plug-in hybrids where an active cabin heater soak timer set P2183 wrongly. Mazda3 sensors at the radiator bottom let water in and read too low. Real causes are corrosion and drift; others need a software update. Low, high and erratic signals are P2184 to P2186.

Likely causes

Water ingress or internal corrosion in sensor 2 shifting its reading

Control software misjudging soak time, block heater or cabin heater use

Coolant hoses at the sensor loop swapped or air trapped after service

Aged sensor element drifting out of tolerance

Symptoms

Check engine light, often right after a cold start
Remote start disabled on some trucks
Engine overheat message without real overheating on some hybrids

Repair estimate

DifficultyEasyDIY possible

Parts and labour€0–250

Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

engine coolant temperature sensor 2

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.