[SOLVED] Dodge P0128 Code: Fast Fix For Thermostat Rationality

The OBD code P0128 for Dodge indicates a thermostat regulating the engine temperature is not functioning properly.

This affects the engine coolant system.

Symptoms include the Engine Light being ON.

Causes may include a faulty thermostat, low coolant level, or a defective coolant temperature sensor.

This issue should be addressed promptly to prevent engine damage.

A possible fix involves checking and replacing any damaged components in the coolant system.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	6.67 (Out of 10)

Symptoms of the Dodge p0128 OBD Code

The Dodge P0128 fault code typically indicates a coolant thermostat that is stuck open.

Symptoms: Engine Light ON.
Temperature gauge reading lower or higher than normal.
Heater not working as efficiently.
Thermostatrelated trouble code stored in the vehicle’s computer.

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Causes of the Dodge p0128 OBD Code

Possible reasons for Dodge code P0128 include a faulty thermostat, low coolant level, or a malfunctioning coolant temperature sensor.

P0128 can be caused by a leaking or stuck open thermostat.
Low engine coolant level.
Insufficient warm up time.
A faulty engine coolant temperature sensor.
An engine coolant temperature sensor harness that is open or shorted.
An engine coolant temperature sensor circuit with a poor electrical connection.

Fixing Dodge Error Code p0128 Step By Step

Address the P0128 code by checking the thermostat operation and coolant level for proper engine temperature regulation.

To fix a Dodge OBDII code P0128, start by reviewing the ‘Possible Causes’ mentioned above and visually examining the corresponding wiring harness and connectors.
Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Next, test the operation of the thermostat to ensure it is functioning correctly.
If the thermostat is faulty, replace it with a new one.
Clear the fault code from the vehicle’s computer using a scan tool.
Finally, test drive the vehicle to verify that the code does not return, indicating a successful repair.

Cost Of Fixing Dodge p0128 Fault Code

The repair for Dodge code P0128 typically involves replacing the thermostat.

The cost to diagnose and fix the Dodge OBD code P0128 typically ranges from $75 to $150 per hour for labor rates.

With an estimated repair time of 1. 0 hour, the total cost can be around $75 to $150, depending on shop rates and the complexity of the issue.

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Details of the Dodge p0128 OBD Code

Dodge code P0128 indicates a thermostat rationality fault due to engine coolant temperature below thermostat regulating temperature.

Dodge OBD code P0128 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 cooling system of the engine.

It indicates that the engine is not reaching the proper operating temperature within a specified time frame.

This could be caused by a faulty thermostat, a malfunctioning coolant temperature sensor, a stuck open cooling system thermostat, or low coolant levels.

It is important to diagnose and repair this issue promptly to prevent potential engine damage and to ensure optimal fuel efficiency and emissions control.

Mechanic’s Tech Notes

Detailed information on Dodge code P0128, including possible causes and diagnostic procedures.

To diagnose and fix OBDII code P0128 on a Dodge, start by checking the engine coolant temperature (ECT) sensor using a voltmeter.

Ensure the sensor is providing accurate readings within specifications.

Next, inspect the thermostat for proper operation and replace if necessary.

Use a scan tool to monitor ECT sensor data and verify if it matches actual engine temperature.

If discrepancies are found, consider replacing the ECT sensor.

Additionally, check for any coolant leaks or air pockets in the cooling system that may affect temperature readings.

Finally, clear the code and test drive the vehicle to ensure the issue is resolved.

FAQ

1. What are the common causes of OBD code P0128 in a Dodge vehicle?

Common causes of OBD code P0128 in a Dodge vehicle include a leaking or stuck open thermostat, low coolant level, faulty coolant temperature sensor, or wiring issues.

2. How can I diagnose and fix OBD code P0128 in my Dodge vehicle?

Diagnose and fix OBD code P0128 in your Dodge by checking thermostat, coolant level, warmup time, and coolant temperature sensor. Inspect wiring and connectors for damage.

3. Is it safe to continue driving with OBD code P0128 present in my Dodge vehicle?

It is not safe to continue driving with OBD code P0128 in your Dodge. Check for thermostat issues, low coolant, or faulty sensors immediately.

Wrap Up

If your Dodge triggers OBD code P0128 and the temperature gauge stays low, it may indicate a faulty thermostat, low coolant level, or a malfunctioning coolant temperature sensor.

Wiring issues or a stuckopen thermostat can also trigger this code.

To address Dodge OBD code P0128, check the coolant level and quality, test the thermostat operation, inspect the coolant temperature sensor and its wiring harness for any damage or corrosion, and replace components as needed to restore proper engine temperature regulation.