Powertrain, generic · Fuel and air metering (injector circuit)

P0218 Transmission Fluid Temperature Sensor A Over Temperature Condition

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P0218 is a condition code: the transmission or engine module reports that transmission fluid temperature sensor A reads above an overheat limit. Saab's Aisin automatic sets it above 170 °C for more than 10 s, or above 140 °C for two minutes at high speed, shows a 'transmission overheating' warning and shifts less smoothly; afterwards a fluid change is advised because the additives are spent. Ford uses its own code on diesels and lists P0218 without the warning light on other models. Reactions include earlier torque converter lock-up, a modified shift pattern and sometimes reduced power. Causes are real overheating – towing, hills, low or old fluid, a clogged cooler – or a sensor reading wrongly.

Likely causes

High load (towing, hills, sustained full throttle, stop-and-go in heat)
Transmission fluid low or aged
Fluid cooler, thermostat or lines clogged, weak cooling system
Torque converter clutch slipping or internal damage
Temperature sensor or wiring reading wrongly

Symptoms

  • Transmission overheating warning
  • Changed or harsh shifting
  • Limp mode or reduced power possible
  • Burnt fluid smell

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–800
Time0.5–4 h

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

Parts involved

transmission fluid temperature sensortransmission coolerautomatic transmission

Related codes

P0710P0711P0712P0713P0217

References: law.cornell.edu, saabwisonline.com, roushcleantech.com.