OBD Guide
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P112B

Engine Coolant Temperature Too Low

P112B is an OBD-II diagnostic trouble code meaning: Engine Coolant Temperature Too Low. Common causes: coolant temperature sensor malfunction, open or short circuit in the sensor circuit. Estimated repair cost: $6–33.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–33 (est.)

Symptoms

  • Increased fuel consumption
  • Unstable engine operation at idle
  • Reduced engine power
  • Check Engine Light on Dashboard
  • The engine takes a long time to warm up

Causes

  • Coolant temperature sensor malfunction
  • Open or short circuit in the sensor circuit
  • Thermostat malfunction (stuck open)
  • Low coolant level
  • Problems with the engine ECU

How to Fix

  1. Check coolant level
  2. Check thermostat operation
  3. Check the coolant temperature sensor and its circuit
  4. Replace faulty temperature sensor
  5. Scan the ECU for additional errors

Related codes

P0115P0116P0117

FAQ

What does the P112B code mean?

P112B is an OBD-II diagnostic trouble code that indicates: Engine Coolant Temperature Too Low

What causes a P112B error code?

The most common causes of P112B include: Coolant temperature sensor malfunction; Open or short circuit in the sensor circuit; Thermostat malfunction (stuck open); Low coolant level.

How do I fix a P112B diagnostic trouble code?

To fix P112B: Check coolant level. Check thermostat operation. Check the coolant temperature sensor and its circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P112B?

Yes, but get it checked soon

How much does it cost to fix P112B?

The estimated repair cost for P112B is $6–33. Actual cost depends on your vehicle, location, and labor rates.

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