P0118 Pontiac 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 Pontiac 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 Pontiac 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 Pontiac?
- 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 Pontiac?
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 Pontiac 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 Pontiac code?
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Frequently Asked Questions about P0118 Pontiac Code
1. What are the common symptoms of OBDII code P0118 in a Pontiac?
Symptoms may include engine overheating, inaccurate temperature gauge readings, poor fuel economy, and potential issues with the vehicle's heater.
2. What are the possible causes of the P0118 code in a Pontiac?
Potential causes include a faulty engine coolant temperature sensor, wiring issues, a malfunctioning thermostat, low coolant levels, or issues with the engine's cooling system.
3. How can I diagnose the P0118 code in my Pontiac?
Diagnosis typically involves checking the engine coolant level, inspecting the coolant temperature sensor and its wiring for any damage or corrosion, and testing the thermostat for proper functioning.
4. Can I continue driving my Pontiac with the P0118 code present?
It is not recommended to drive with the P0118 code as it can lead to engine damage due to overheating. It is best to address the issue promptly to prevent further complications.
5. How can I reset the P0118 code in my Pontiac?
Resetting the OBDII code can be done with an OBDII scanner or by disconnecting the car's battery for a few minutes. However, it is important to address the underlying issue causing the code to prevent it from reoccurring.
6. Is the repair for the P0118 code in a Pontiac something I can do myself?
Depending on your automotive knowledge and skills, you may be able to address the issue yourself by replacing the engine coolant temperature sensor, checking and repairing any damaged wiring, or testing and replacing the thermostat.
7. Will the P0118 code affect my Pontiac's performance?
The P0118 code can impact your Pontiac's performance by potentially causing engine overheating, reduced fuel efficiency, and other issues related to the engine's temperature regulation.
8. How much does it typically cost to repair the P0118 code in a Pontiac?
The cost of repairing the P0118 code can vary depending on the exact cause of the issue and whether you choose to do the repair yourself or take your vehicle to a mechanic. Costs may include parts and labor.
9. Can a faulty engine coolant temperature sensor cause other issues in my Pontiac?
Yes, a faulty engine coolant temperature sensor can cause a variety of issues beyond triggering the P0118 code, such as poor engine performance, decreased fuel efficiency, and potential damage to the engine if not addressed promptly.
10. How often should I check my Pontiac's coolant system to prevent the P0118 code from occurring?
It is recommended to check your Pontiac's coolant system regularly as part of routine maintenance to ensure proper functioning and prevent issues like the P0118 code. Checking coolant levels, inspecting for leaks, and monitoring temperature readings can help prevent this issue.
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