P1115 OBD-II Trouble Code: Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P1115 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P1115 code

P1115 is a diagnostic trouble code (DTC) for "Engine Coolant Temperature (ECT) Sensor Circuit Intermittent High Voltage/IAT - B Circuit High Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P1115 DIAGNOSTIC Get a fair and transparent estimate upfront

P1115 definition

A P1115 trouble code is related to a high voltage reading from either the engine coolant temperature or intake air temperature sensor that relays temperatures to the engine computer.

What the P1115 code means

P1115 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 higher than the manufacturer’s parameters. A high voltage reading is usually associated with lower engine coolant or air intake temperatures being read by gauges. This code is very similar to a P1114 with the exception of the voltage reading being high.

What causes the P1115 code?

The most common causes for a P1115 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 P1115 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 higher than actual temperature reading, or an inoperable temperature gauge all together.

How does a mechanic diagnose the P1115 code?

The cause of a P1115 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 and with a P1115, your mechanic will need to look for a higher signal being sent by the sensors.

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

Common mistakes when diagnosing the P1115 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 P1115 codes as each manufacturer will require different repair techniques. For example, Mazda specific codes require troubleshooting of the intake air temperature sensors while Honda’s deal with the engine coolant temperature sensor.

How serious is the P1115 code?

Faulty intake air temperature readings can cause a variety of unsavory driving characteristics, making it fairly serious for you to correct a P1115 as quickly as possible. Codes relating to an engine coolant temperature sensor may be even more important as they’ll typically read higher coolant readings than what is actually circulating through the engine.

What repairs can fix the P1115 code?

The most common repairs for a P1115 are as follows:

Additional comments for consideration regarding the P1115 code

All P1115 codes can be found on Volkswagen/Audi, Ford, Isuzu, Mazda, Honda/Acura, General Motors, and Ford vehicles.

Need help with a P1115 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 1-800-701-6220.

trouble codes
P1115
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P1115 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

Related questions

I got a p 507 code

That's a good question. P507 is your idle speed control. There are a few issues you may want to look into. The throttle valve may be sticking, bad throttle motor, ECM, or a wiring problem. I would start by checking...

the car wont pass emmissions the code po420 comes up

Fault code P0420 indicates the catalytic converter is operating below proper efficiency. There are two oxygen (O2) sensors in the exhaust system. One just before and one just after the catalytic converter. The ecu reads the first O2 sensor to...

My traction control is off and half of the engine doesn't work, I hooked up a computer to it and the P0800 code is on

Hello, thanks for writing in. P0800 is the trouble code for an issue with the vehicle's Transfer Case Control system. When the transfer case control module, a computer that is separate from the engine computer, detects an issue with the...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com