P1115 Chevrolet Code - Engine Coolant Temperature Sensor Circuit Intermittent High Voltage
Quick Answer
The Engine Coolant Temperature (ECT) sensor contains a semiconductor device which changes resistance based on temperature (a thermistor). Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Low engine coolant level, Engine Coolant Temperature (ECT) sensor harness is open or shorted. 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
- P1115 Chevrolet indicates Engine Coolant Temperature Sensor Circuit Intermittent High Voltage.
- Common causes
- Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Low engine coolant level, Engine Coolant Temperature (ECT) sensor harness is open or shorted.
- 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 P1115 Chevrolet Description
When the engine coolant is cold, the sensor (thermistor) resistance is high, and the PCMs signal voltage is only pulled down a small amount through the sensor to ground. The PCM senses a high signal voltage (low temperature). When the engine coolant is warm, the sensor resistance is low, and the signal voltage is pulled down a greater amount. This causes the PCM to sense a low signal voltage (high temperature).
What are the Possible Causes of the DTC P1115 Chevrolet?
- Faulty Engine Coolant Temperature (ECT) sensor
- Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty engine coolant thermostat
How to Fix the DTC P1115 Chevrolet?
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 P1115 Chevrolet 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.
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Frequently Asked Questions about P1115 Chevrolet Code
1. What does the OBDII code P1115 mean on a Chevrolet?
P1115 indicates an intermittent high voltage issue in the Engine Coolant Temperature (ECT) sensor circuit, suggesting a problem with the sensor or its wiring.
2. What are the symptoms of code P1115 in a Chevrolet?
Symptoms may include poor fuel efficiency, engine overheating, difficulty starting the engine, erratic temperature gauge readings, or the check engine light turning on.
3. What causes the P1115 code to trigger?
Common causes include a faulty ECT sensor, damaged or corroded wiring or connectors, a short circuit, or issues with the vehicle's Engine Control Module (ECM).
4. Can I drive my Chevrolet with a P1115 code active?
Driving with this code is not recommended as it can lead to inaccurate temperature readings, engine performance issues, and potential engine damage if overheating occurs.
5. How do I diagnose a P1115 code on my Chevrolet?
Start by inspecting the ECT sensor and its wiring for damage or corrosion, check for loose connections, and test the sensor's voltage and resistance using a multimeter.
6. How do I fix the P1115 code on a Chevrolet?
Repairs may include replacing the ECT sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
7. What tools do I need to fix the P1115 code?
You'll need an OBDII scanner, a multimeter to test voltage and resistance, and basic tools for sensor or wiring replacement.
8. How much does it cost to fix a P1115 code on a Chevrolet?
The cost depends on the issue; replacing an ECT sensor typically costs $50-$150 for parts and labor, while wiring repairs may vary based on severity.
9. Can a bad thermostat cause a P1115 code in a Chevrolet?
A malfunctioning thermostat might indirectly contribute to this code by causing temperature fluctuations, but it’s not a direct cause of high voltage in the ECT sensor circuit.
10. Will clearing the code fix the P1115 issue?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent it from returning.
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