Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is getting a signal that the temperature sensor for the radiator is too low, like it's not working right or is disconnected.
This code indicates that the signal from the radiator coolant temperature sensor is below the expected range.
The P00B3 code is triggered when the Engine Control Module (ECM) detects a low voltage signal from the radiator coolant temperature sensor. This sensor monitors the temperature of the coolant in the radiator to ensure the engine operates within the optimal temperature range. A low circuit signal could indicate a faulty sensor, wiring issues, or a problem with the ECM.
• Check Engine Light illuminated
• Engine overheating
• Poor fuel economy
• Faulty radiator coolant temperature sensor
• Damaged or corroded wiring/connectors
• ECM malfunction
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the radiator coolant temperature sensor and its wiring for damage.
• Test the sensor's resistance and compare it to the manufacturer's specifications.
• Replace the radiator coolant temperature sensor.
• Repair or replace damaged wiring/connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly check and maintain coolant levels.
• Inspect wiring and connectors for corrosion.
• Schedule periodic engine diagnostics.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Monitor engine temperature to prevent overheating.
Check with the vehicle manufacturer for sensor coverage under warranty.
This code has been reported in vehicles with aging sensors or those exposed to harsh environmental conditions.
Moderate – Addressing this issue is important to prevent potential engine damage.
Operating a vehicle with this code may lead to engine overheating, which can cause serious damage.
• Engine at operating temperature
• Coolant system fully pressurized
The radiator coolant temperature sensor is typically located near the radiator or in the engine block.
Q: Can I drive with a P00B3 code?
A: It's not recommended to drive for long periods with this code, as it may lead to engine overheating.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Relevant when coolant-temperature and warm-up faults indicate a thermostat-related issue.
Coolant-temperature and warm-up faults often lead to thermostat testing and replacement.
Thermostats are vehicle-specific and should be matched by engine and housing style.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.