DTC P0116: Engine Coolant Temperature Circuit Range / Performance Problem: Description

2012 Toyota Prius ThreeSECTION Description

Refer to DTC P0115. Refer to DESCRIPTION .

DTC No. DTC Detection Condition Trouble Area
P0116 When either of the following conditions is met (2 trip detection logic):
  • During engine warm up after cold engine starts, change in engine coolant temperature sensor output is below threshold
  • In duration between warmed engine stopped and next cold engine starts, change in engine coolant temperature sensor output below threshold
  • Water inlet with thermostat sub-assembly
  • Engine coolant temperature sensor
For Mexico Models:
Case 1:
Engine coolant temperature between 35°C and 60°C (95°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic)
  • (a) Vehicle driven at varying speeds (accelerated and decelerated)
  • (b) Engine coolant temperature remains within 3°C (5.4°F) of initial engine coolant temperature

Case 2:
Engine coolant temperature more than 60°C (140°F) when engine started, and conditions (a) and (b) met (1 trip detection logic)
  • (a) Vehicle driven at varying speeds (accelerated and decelerated)
  • (b) Engine coolant temperature measurements remain within 1°C (1.8°F) of initial engine coolant temperature on 6 successive occasions
  • Water inlet with thermostat sub-assembly
  • Engine coolant temperature sensor
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.