Engine Coolant Temperature (ECT) Sensor 1 Circuit
1998-1998 Buick Century 3.1L V6
The 1998 Buick Century is equipped with a 3.1L V6 engine. Below you'll find detailed p0115 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
General malfunction in the engine coolant temperature sensor circuit.
Symptoms
- Check Engine Light
- Poor fuel economy
- Hard starting
- Incorrect temp gauge reading
- Fans not operating correctly
Common Causes
- Faulty ECT sensor
- Wiring damage
- Corroded connector
- Low coolant level
Diagnostic Steps
- Test ECT resistance at known temperature
- Inspect wiring
- Check coolant level
- Compare ECT to IAT at cold start
Repair Notes
Replace ECT sensor or repair wiring. Verify coolant level.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0115 on Other Vehicles
Common Questions
What does code P0115 mean on a 1998-1998 Buick Century?
P0115 stands for "Engine Coolant Temperature (ECT) Sensor 1 Circuit". General malfunction in the engine coolant temperature sensor circuit.
What are the symptoms of P0115 on a Buick Century?
Common symptoms of P0115 include: Check Engine Light, Poor fuel economy, Hard starting, Incorrect temp gauge reading, Fans not operating correctly.
What causes P0115 on a 1998-1998 Buick Century?
Common causes of P0115 include: Faulty ECT sensor, Wiring damage, Corroded connector, Low coolant level.
Last updated: March 2026