P0118 2015 Chevrolet Silverado Code - Engine Coolant Temperature Circuit High Input
Quick Answer
The Engine Coolant Temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0118 2015 Chevrolet Silverado indicates Engine Coolant Temperature Circuit High Input.
- Common causes
- Common causes include Low engine coolant level, Leaking or stuck open thermostat, Faulty Engine Coolant Temperature (ECT) sensor.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0118 2015 Chevrolet Silverado Description
The ECM uses this high side coolant rationality diagnostic to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the ignition is OFF. If the calibrated ignition OFF time is met at start-up, the ECM will compare the temperature difference between the ECT and the intake air temperature (IAT) to determine if the temperatures are within an acceptable operating range of each other. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a the ECT is colder than -39°C (-38°F) for greater than 5 s.
What are the Possible Causes of the DTC P0118 2015 Chevrolet Silverado?
- Low engine coolant level
- Leaking or stuck open thermostat
- Faulty Engine Coolant Temperature (ECT) sensor
- Engine Coolant Temperature sensor harness is open or shorted
- Engine Coolant Temperature sensor electrical circuit poor connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0118 2015 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0118 2015 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0118 2015 Chevrolet Silverado code?
Need more information on how to fix the P0118 2015 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0118 2015 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0118 2015 Chevrolet Silverado Code
1. What does the OBDII code P0118 mean on a 2015 Chevrolet Silverado?
P0118 indicates a high voltage input from the Engine Coolant Temperature (ECT) sensor circuit, which suggests the sensor is reporting an abnormally high or out-of-range temperature reading.
2. What are the common symptoms of code P0118 in a 2015 Silverado?
Symptoms may include the check engine light turning on, poor fuel economy, engine running rich, difficulty starting the engine, or erratic temperature gauge readings.
3. What causes the P0118 code to appear on a 2015 Chevrolet Silverado?
Common causes include a faulty ECT sensor, damaged wiring or connectors in the ECT circuit, corroded electrical connections, or a failed PCM (Powertrain Control Module).
4. How do you diagnose a P0118 code on a 2015 Silverado?
Diagnosis involves scanning for codes, inspecting the ECT sensor and wiring for damage or corrosion, checking the sensor's voltage output with a multimeter, and verifying the sensor's resistance matches the expected range at specific temperatures.
5. Can I drive my 2015 Silverado with a P0118 code?
While the truck may still be drivable, it’s not recommended as the engine may run inefficiently, potentially causing long-term damage or performance issues.
6. How do you fix the P0118 code on a 2015 Chevrolet Silverado?
Repairs may include replacing the ECT sensor, repairing or replacing damaged wiring or connectors, cleaning corroded connections, or in rare cases, reprogramming or replacing the PCM.
7. Where is the ECT sensor located on a 2015 Chevrolet Silverado?
The ECT sensor is typically located near the thermostat housing on the engine block, where it measures the temperature of the engine coolant.
8. How much does it cost to fix the P0118 code on a 2015 Silverado?
The repair cost varies, but replacing an ECT sensor typically ranges from $50 to $150, including parts and labor. Additional repairs, such as wiring fixes or PCM replacement, may increase the cost.
9. Can a P0118 code cause engine overheating in a 2015 Silverado?
The code itself doesn’t directly cause overheating, but incorrect coolant temperature readings can lead to improper engine management, which may contribute to overheating over time.
10. How can I prevent the P0118 code from recurring in my 2015 Silverado?
Regular maintenance, including inspecting and cleaning electrical connections, checking wiring for damage, and replacing the ECT sensor at recommended intervals, can help prevent this issue.
Discuss the causes and fixes for P0118 2015 Chevrolet Silverado OBDII Code
Code P0118 2015 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
