Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that a sensor inside the car's computer is saying it's too cold, which might make the car not work right.
The vehicle's control module has an internal temperature sensor that monitors the temperature. This code indicates that the sensor is reading a temperature that is too low, which is outside the expected range.
The P187E code is triggered when the Powertrain Control Module (PCM) or Transmission Control Module (TCM) detects that the internal temperature sensor 'A' circuit is reporting a temperature lower than the expected range. This could be due to a malfunctioning sensor, wiring issues, or a fault within the control module itself.
• Check Engine Light is on
• Poor engine performance
• Transmission issues
• Faulty temperature sensor
• Wiring issues or poor electrical connections
• Faulty control module
PCM: Powertrain Control Module
TCM: Transmission Control Module
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the temperature sensor for proper operation.
• Replace the faulty temperature sensor.
• Repair or replace damaged wiring or connectors.
• Replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $600
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular maintenance checks
• Ensure proper electrical connections
• Avoid extreme temperature exposure
Sensor Issue
• Do not ignore the Check Engine Light.
• Consult a professional mechanic if unsure.
• Regularly check your vehicle's electrical systems.
Check your vehicle's warranty for coverage on control module repairs.
This code has been associated with vehicles experiencing sensor malfunctions due to extreme temperature conditions.
Moderate – It's important to address this issue to prevent further vehicle performance problems.
Driving with a malfunctioning sensor can lead to increased emissions and potential safety risks.
• Vehicle at operating temperature
• Stable electrical supply
The internal temperature sensor is located within the vehicle's control module, typically found in the engine bay or under the dashboard.
Q: Can I drive my car with a P187E code?
A: It's not recommended to drive for extended periods with this code as it may lead to further issues.
Q: How do I reset the Check Engine Light after repairs?
A: Use an OBD-II scanner to clear the codes after completing repairs.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.