P118E 2018 GMC Sierra Code - Exhaust Gas Temperature Sensor 1 Performance Engine Running
Quick Answer
The exhaust gas temperature sensors are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor circuit poor electrical connection. 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
- P118E 2018 GMC Sierra indicates Exhaust Gas Temperature Sensor 1 Performance Engine Running.
- Common causes
- Common causes include Faulty Exhaust Gas Temperature Sensor, Exhaust Gas Temperature Sensor harness is open or shorted, Exhaust Gas Temperature Sensor circuit poor electrical connection.
- 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 P118E 2018 GMC Sierra Description
What are the Possible Causes of the DTC P118E 2018 GMC Sierra?
- Faulty Exhaust Gas Temperature Sensor
- Exhaust Gas Temperature Sensor harness is open or shorted
- Exhaust Gas Temperature Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P118E 2018 GMC Sierra?
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 P118E 2018 GMC Sierra 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 P118E 2018 GMC Sierra Code
1. What does the OBDII code P118E mean on a 2018 GMC Sierra?
P118E indicates an issue with the Exhaust Gas Temperature (EGT) Sensor 1, specifically its performance while the engine is running.
2. What are the common symptoms of code P118E on a 2018 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel efficiency, the check engine light turning on, or the engine going into limp mode.
3. What causes the P118E code to appear on a 2018 GMC Sierra?
Common causes include a faulty EGT sensor, damaged wiring or connectors, excessive soot buildup, or an issue with the engine control module (ECM).
4. Can I drive my 2018 GMC Sierra with the P118E code?
Driving with this code is not recommended, as it may lead to further engine or emissions system damage and decreased performance.
5. How do I diagnose the P118E code on a 2018 GMC Sierra?
Diagnose the code by inspecting the EGT sensor and its wiring, checking for soot buildup, and using a diagnostic tool to confirm the sensor’s readings.
6. How do I fix the P118E code on a 2018 GMC Sierra?
Repairs may include replacing the EGT sensor, cleaning soot buildup, repairing damaged wiring, or updating the ECM software if necessary.
7. How much does it cost to repair the P118E code on a 2018 GMC Sierra?
Repair costs can range from $100 to $300, depending on whether the issue is a sensor replacement or wiring repair.
8. What does the Exhaust Gas Temperature Sensor do?
The EGT sensor monitors the temperature of exhaust gases to optimize engine performance and emissions control.
9. Can a faulty EGT sensor cause engine damage?
Yes, a faulty EGT sensor can lead to improper engine operation, increased emissions, and potential damage to the turbocharger or catalytic converter.
10. Will clearing the P118E code fix the problem?
Clearing the code may temporarily remove the check engine light, but unless the underlying issue is resolved, the code will likely return.
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