The OBD code P0118 for GMC indicates a problem with the Engine Coolant Temperature (ECT) sensor circuit.
This affects the engine cooling system.
Symptoms include the Check Engine light being illuminated.
Causes may include low coolant level, a faulty ECT sensor, or issues with the sensor’s wiring.
While not an immediate emergency, it should be addressed promptly to prevent potential engine damage.
A possible fix involves inspecting and repairing any damaged components or wiring related to the ECT sensor.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
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Symptoms of the Gmc p0118 OBD Code
The vehicle may experience overheating or poor engine performance with GMC code P0118.
- Symptoms: Engine Light ON.
- Temperature gauge reading very high.
- Loss of power during acceleration.
- Engine may run rough or stall.
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Causes of the Gmc p0118 OBD Code
Fault code P0118 on a GMC typically indicates an issue with the engine coolant temperature sensor circuit.
- P0118 can be caused by low engine coolant level.
- A leaking or stuck open thermostat.
- A faulty Engine Coolant Temperature (ECT) sensor.
- An Engine Coolant Temperature sensor harness that is open or shorted.
- An Engine Coolant Temperature sensor electrical circuit with poor connection.
- A faulty Engine Control Module (ECM).
Fixing Gmc Error Code p0118 Step By Step
Address the high engine coolant temperature sensor circuit voltage issue on a GMC with code P0118.
- To fix a GMC OBDII code P0118, first, review the possible causes related to the engine coolant temperature (ECT) sensor circuit.
- Visually inspect the ECT sensor wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- If any issues are found, repair or replace the damaged components as necessary.
- Clear the fault code from the vehicle’s computer using a scan tool.
- Start the engine and monitor the ECT sensor data to ensure it is reading accurately.
- If the code returns, consider replacing the ECT sensor itself.
Cost Of Fixing Gmc p0118 Fault Code
The repair for GMC P0118 may involve replacing the engine coolant temperature sensor.
The cost to diagnose and fix a GMC OBD code P0118 typically ranges from $75 to $150 per hour for labor rates.
With an estimated repair time of 1. 0 hour, the total cost could be around $75 to $150, depending on shop rates and the complexity of the issue.
Details of the Gmc p0118 OBD Code
GMC P0118 indicates a high engine coolant temperature sensor signal.
GMC OBD code P0118 indicates a high voltage condition in the Engine Coolant Temperature (ECT) sensor circuit.
This code is triggered by the Engine Control Module (ECM) when it detects that the ECT sensor voltage is above the specified range.
The ECT sensor is the component that triggers this fault code.
It is usually located near the thermostat housing or on the cylinder head.
The ECT sensor measures the temperature of the engine coolant and provides this information to the ECM.
When the ECM receives a signal from the ECT sensor that indicates a high voltage condition, it will trigger the P0118 fault code.
This can be caused by issues such as a faulty ECT sensor, a wiring problem in the ECT circuit, or a problem with the ECM itself.
It’s important to diagnose and repair the underlying cause of the high voltage condition in the ECT sensor circuit to prevent potential engine performance issues or damage.
Mechanic’s Tech Notes
Detailed information on diagnosing and repairing GMC code P0118 related to engine coolant temperature sensor circuit high input.
OBDII code P0118 for GMC indicates an issue with the Engine Coolant Temperature (ECT) sensor circuit.
To diagnose, use a voltmeter to test the ECT sensor’s resistance and compare it to specifications.
Check the sensor’s wiring for any damage or corrosion.
Verify the sensor’s signal with a scan tool to ensure it matches actual temperature readings.
If the sensor and wiring are fine, the issue may lie with the Engine Control Module (ECM).
Reflash the ECM if necessary.
Remember to clear the code after repairs to see if it returns.
FAQ
Common causes of OBD code P0118 in a GMC vehicle include low coolant level, faulty ECT sensor, or ECM issues. Check wiring and connectors for damage.
Diagnose P0118 in GMC: Check coolant level, thermostat, ECT sensor, harness, ECM. Inspect wiring for damage, connector pins for issues. Fix as needed.
It is not safe to continue driving with OBD code P0118 in a GMC vehicle. Check coolant level, thermostat, ECT sensor, wiring, and connectors for issues.
Wrap Up
If your GMC is displaying OBD code P0118 along with issues like overheating, poor fuel economy, or rough idling, it may indicate a problem with the Engine Coolant Temperature (ECT) sensor, wiring faults, or low coolant levels.
To address GMC OBD code P0118, start by checking the ECT sensor and its wiring harness for any signs of damage or corrosion.
Ensure the coolant level is adequate and test the sensor’s resistance to determine if a replacement is necessary.
Additionally, inspect the connectors for any loose or bent pins that could be causing a poor connection.
