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P1114 OBD-II Trouble Code: Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input

Check Engine Light

P1114 definition

A P1114 trouble code is related to a low voltage reading from either the engine coolant temperature or intake air temperature sensor that relays temperatures to the engine computer.

What the P1114 code means

P1114 is a OBD-II manufacturer-specific code for a voltage issue with either the engine coolant temperature or intake air temperature sensor in that the signal being sent to the engine computer is lower than the manufacturer’s parameters. A low voltage reading is usually associated with higher than normal engine coolant or air intake temperatures.

What causes the P1114 code?

The most common causes for a P1114 are:

  • Faulty intake air temperature sensor
  • Faulty intake air temperature sensor wiring/electrical connectors
  • Faulty engine coolant temperature sensor
  • Faulty engine coolant temperature sensor wiring/electrical connectors
  • Faulty engine computer computer

What are the symptoms of the P1114 code?

Some of the symptoms of bad intake air temperature sensors range from a lack of power, trouble with cold starts, and decreased fuel economy. A faulty engine coolant temperature sensor will usually only result in a low or inoperable temperature gauge.

How does a mechanic diagnose the P1114 code?

The cause of a P1114 code will not only depend on what the code reads, but what make your vehicle is as they are manufacturer specific. Some codes may point directly at the engine temperature sensor being the fault, requiring your mechanic conducts both a visually inspection and monitor of the signal being sent out by the sensor. Testing for a intake air temperature sensor will be similar.

If any of the sensor readings are not within the manufacturer’s parameters, they will need to be replaced.

Common mistakes when diagnosing the P1114 code

Because all P1XXX codes are manufacturer specific, it’s critical to have any code read by a professional-grade OBD-II scanner to ensure you’re fixing the correct problem. This is even more prevalent with P1114 codes as each manufacturer will require different repair techniques. For example, a P1114 code in a General Motors vehicle will read a ECT code, but the IAT sensor will typically be to blame.

How serious is the P1114 code?

Faulty intake air temperature readings can cause a variety of unsavory driving characteristics, making it fairly serious for you to correct a P1114 as quickly as possible. Codes relating to an engine coolant temperature sensor may be even more important as they’ll typically read lower coolant readings than what is actually circulating through the engine.

What repairs can fix the P1114 code?

The most common repairs for a P1114 are as follows:

Additional comments for consideration regarding the P1114 code

All P1114 codes can be found on Volkswagen/Audi, Ford, Isuzu, Mazda, Honda/Acura, General Motors, and Ford vehicles.

Need help with a P1114 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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