Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has two temperature sensors to check how hot the engine is. This code means they are not agreeing on the temperature.
The engine control module (ECM) compares the readings from two engine coolant temperature sensors. If the readings are not within a specified range, this code is triggered.
The P011A code is set when the ECM detects a discrepancy between the readings of Engine Coolant Temperature Sensor 1 and Sensor 2. These sensors are used to monitor the engine's operating temperature and ensure proper engine management.
• Check Engine Light is on
• Engine may overheat
• Poor fuel economy
• Erratic temperature gauge readings
• Faulty Engine Coolant Temperature Sensor 1
• Faulty Engine Coolant Temperature Sensor 2
• Wiring issues or poor connections
• Faulty ECM (Engine Control Module)
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Compare the readings of both temperature sensors using a diagnostic tool.
• Test the sensors individually for proper function.
• Replace the faulty temperature sensor.
• Repair or replace damaged wiring or connectors.
• Update or reprogram the ECM if necessary.
• OBD-II Scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Ford Focus
• Chevrolet Silverado
• Toyota Camry
• Regularly check and maintain coolant levels.
• Inspect wiring and connectors periodically.
• Ensure the cooling system is functioning properly.
Sensor Issue
• Do not ignore the Check Engine Light.
• Monitor engine temperature to prevent overheating.
• Seek professional diagnosis if unsure.
Check with your vehicle manufacturer for warranty coverage on sensors and ECM.
This code has been common in vehicles with dual temperature sensors since the introduction of OBD-II systems.
Moderate – Address the issue to prevent engine overheating.
Driving with a faulty engine temperature sensor can lead to engine damage and is not recommended.
• Engine at operating temperature
• Stable ambient temperature
The engine coolant temperature sensors are typically located near the thermostat housing or in the engine block.
Q: Can I drive with a P011A code?
A: It's not recommended as it can lead to engine overheating.
Q: How do I reset the P011A code?
A: After repairs, use an OBD-II scanner to clear the code.
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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.