P2182 — Engine Coolant Temperature Sensor 2 Circuit

OBD2 code P2182 flags a problem with the engine cooling and temperature control (engine coolant temperature sensor 2 circuit). Short, gentle driving to a shop is usually possible. Common culprits: water pump or radiator issues, wiring faults in the sensor circuit, low coolant level or air in the system.

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution and watch the temperature gauge. A thermostat stuck open mainly costs fuel; any sign of overheating means stop immediately — driving an overheating engine destroys head gaskets and worse.

How to diagnose with an OBD scanner

  1. Read the code and freeze frame Connect an OBD2 scanner, confirm P2182 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the engine cooling and temperature control for damage, corrosion, chafing or poor contact.
  4. Subsystem check Watch coolant temperature in live data during warmup — it should climb smoothly to operating temperature.
  5. Subsystem check Check coolant level and feel upper/lower radiator hoses to verify thermostat operation.
  6. Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2182 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2182 (parts and labor, USD, independent shop rates): Replace the coolant temperature sensor: $100–$300; Replace the thermostat: $150–$400; Cooling system repair (pump, fan, radiator): $300–$1,200. Overall, fixing P2182 usually costs between $100 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of P2182?

Drivers most often notice: increased fuel consumption, Check Engine Light on, cooling fans running constantly, overheating warnings in severe cases.

Will P2182 clear itself?

Sometimes P2182 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What is the most common cause of P2182?

The most common causes are: water pump or radiator issues, wiring faults in the sensor circuit, low coolant level or air in the system.

What does OBD2 code P2182 mean?

OBD2 code P2182 flags a problem with the engine cooling and temperature control (engine coolant temperature sensor 2 circuit). Short, gentle driving to a shop is usually possible. Common culprits: water pump or radiator issues, wiring faults in the sensor circuit, low coolant level or air in the system.

How much does it cost to fix P2182?

Replace the coolant temperature sensor — $100–$300; Replace the thermostat — $150–$400; Cooling system repair (pump, fan, radiator) — $300–$1,200. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does P2182 mean?

Behind P2182 is a specific failure in the engine cooling and temperature control: engine coolant temperature sensor 2 circuit. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2182 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

Common symptoms of P2182

  • increased fuel consumption
  • Check Engine Light on
  • cooling fans running constantly
  • overheating warnings in severe cases
  • poor cabin heat

What causes P2182?

  • thermostat stuck open or closed
  • failed cooling fan or fan relay
  • low coolant level or air in the system
  • water pump or radiator issues

How to diagnose P2182

  1. Connect an OBD2 scanner, confirm P2182 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
  2. Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
  3. Visually inspect the wiring harness and connectors related to the engine cooling and temperature control for damage, corrosion, chafing or poor contact.
  4. Watch coolant temperature in live data during warmup — it should climb smoothly to operating temperature.
  5. Check coolant level and feel upper/lower radiator hoses to verify thermostat operation.
  6. Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2182 does not return.

How to fix P2182

Start with the cheapest and most common causes before replacing expensive parts:

  • Replace the coolant temperature sensor — $100–$300
  • Replace the thermostat — $150–$400
  • Cooling system repair (pump, fan, radiator) — $300–$1,200

How much does it cost to fix P2182?

Repair cost depends on which component actually failed. Typical scenarios for P2182 (parts and labor, USD, independent shop rates):

  • Replace the coolant temperature sensor: $100–$300
  • Replace the thermostat: $150–$400
  • Cooling system repair (pump, fan, radiator): $300–$1,200

Overall, fixing P2182 usually costs between $100 and $1,200. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2182?

Drive with caution and watch the temperature gauge. A thermostat stuck open mainly costs fuel; any sign of overheating means stop immediately — driving an overheating engine destroys head gaskets and worse.

Related OBD2 codes