The OBD code P0128 for Honda indicates a coolant thermostat issue.
It affects the engine cooling system.
Symptoms include the Check Engine light coming on.
Causes may include low coolant level or a faulty thermostat.
This issue is moderately serious as it can lead to engine overheating.
A possible fix is to inspect and potentially replace the thermostat and check for any related sensor faults.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
I know how frustrating it is to see that warning light pop up again and again. You don’t need to spend money at the mechanic just to clear it. With this pocket-friendly automatic car scanner, you can do it yourself in seconds and and avoid the time and inconvenience of driving to a mechanic. Just plug it in, connect to your Android or iOS phone, and instantly see live data. Understand the fault code, clear it right away, and decide if it’s something urgent or if you’re good to drive. It even monitors your car and sends notifications to your phone, so you’re always in control. Simple, fast, and stress-free—today’s offer price!
Symptoms of the Honda p0128 OBD Code
The vehicle may exhibit a low operating temperature condition indicated by Honda P0128 fault code.
- Symptoms for Honda OBD code P0128: Engine Light ON (or Service Engine Soon Warning Light) may illuminate.
- The engine temperature gauge may show lower than normal operating temperature.
- The heater may blow cold air instead of hot air.
- The vehicle’s fuel efficiency may decrease.
Do you know you can clear most fault codes—but some could mean serious danger? Don’t take chances with your safety or your family’s safety. This budget-friendly car scanner makes it easy to clear fault codes in seconds while showing you exactly what’s wrong. Plug it in, connect to your Android or iOS phone, and instantly check live data. You’ll know if it’s a minor issue you can clear or something serious that needs attention—so you can drive safely and stress-free. (Today’s Deal)
Causes of the Honda p0128 OBD Code
P0128 in a Honda typically indicates a thermostat stuck open or a faulty coolant temperature sensor.
- P0128 can be caused by low engine coolant level.
- Leaking or stuck open thermostat.
- Faulty Engine Coolant Temperature (ECT) Sensor 1.
- Faulty Engine Coolant Temperature Sensor 2.
- Faulty Intake Air Temperature (IAT) Sensor.
- Faulty Manifold Absolute Pressure (MAP) Sensor.
- Faulty Crankshaft Position (CKP) Sensor.
- Faulty Barometric Pressure (BARO) Sensor.
- Faulty Radiator Fan.
Fixing Honda Error Code p0128 Step By Step
Addressing a P0128 fault code on a Honda involves diagnosing and resolving thermostat issues.
- To fix a Honda OBDII code P0128, start by reviewing the possible causes mentioned above.
- Visually examine the corresponding wiring harness and connectors for any damage.
- Inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Check the engine coolant level and quality to ensure it meets manufacturer specifications.
- Replace the thermostat if it is stuck open or not reaching operating temperature.
- Clear the fault code using a scan tool and test drive the vehicle to verify the repair.
Cost Of Fixing Honda p0128 Fault Code
The repair for Honda P0128 typically involves replacing the thermostat to address a low coolant temperature issue.
The cost to diagnose and fix a Honda OBD code P0128 typically ranges from $75 to $150, based on a 1. 0hour repair time.
Factors like shop rates and complexity can affect the final cost.
Details of the Honda p0128 OBD Code
Code P0128 on a Honda indicates an issue with the coolant thermostat.
Code P0128 on a Honda means that the engine coolant temperature is below the thermostat regulating temperature.
This code is triggered by the Engine Control Module (ECM) when it detects that the coolant temperature does not reach the expected temperature within a specified time after starting the engine.
The P0128 code is related to the engine coolant thermostat and the engine coolant temperature sensor.
The thermostat regulates the engine coolant temperature, while the temperature sensor provides feedback to the ECM about the actual coolant temperature.
When the ECM detects that the coolant temperature is not rising as expected, it triggers the P0128 code to indicate a potential issue with the thermostat or the sensor.
Mechanic’s Tech Notes
For Honda code P0128, monitor coolant temperature sensor for possible thermostat or wiring issues.
To diagnose and fix OBDII code P0128 on a Honda, start by checking the engine coolant temperature (ECT) sensor’s resistance with a multimeter.
Ensure the sensor is functioning correctly and providing accurate readings to the engine control module (ECM).
Next, inspect the thermostat for proper operation and replace if necessary.
Verify coolant levels and system integrity.
If all checks out, consider reprogramming the ECM with the latest software.
Additionally, check for any leaks or blockages in the cooling system that may affect temperature regulation.
FAQ
Common causes of OBD code P0128 in a Honda: Low coolant level, leaking thermostat, faulty ECT sensor, faulty IAT sensor, faulty MAP sensor.
Diagnose P0128 in Honda: Check coolant level, thermostat, ECT sensors, wiring. Fix: Inspect wiring, connectors for damage, corrosion. Verify sensor operation and replace faulty components as needed.
It is not safe to continue driving with OBD code P0128 in your Honda. Check coolant level, thermostat, and sensors for issues to prevent engine damage.
Wrap Up
If your Honda triggers OBD code P0128 and the temperature gauge doesn’t reach normal operating levels, it may indicate a faulty thermostat, low coolant levels, or a malfunctioning coolant temperature sensor.
These issues can lead to poor engine performance and reduced fuel efficiency.
To address Honda OBD code P0128, start by checking the thermostat for proper operation, inspecting the coolant level and quality, and testing the coolant temperature sensor for accuracy.
Ensure the wiring harness connected to the sensor is intact and free of damage or corrosion to maintain accurate temperature readings.
