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 the car's computer thinks the transmission fluid is too cold. It's like when you try to swim in a pool that's too chilly; it doesn't work as well.
The transmission fluid temperature sensor 'B' is reporting a temperature that is lower than expected, which might indicate a sensor issue or an actual low fluid temperature.
The P187C code is triggered when the Powertrain Control Module (PCM) detects that the transmission fluid temperature sensor 'B' is reading a temperature lower than the specified range. This sensor helps the PCM manage transmission operation by providing data on the fluid's temperature, which is crucial for proper shifting and performance.
• Check Engine Light illuminated
• Transmission may not shift properly
• Poor fuel economy
• Faulty transmission fluid temperature sensor
• Wiring issues or poor connections
• Low transmission fluid level
PCM: Powertrain Control Module, the computer that controls engine and transmission functions.
OBD-II: On-Board Diagnostics, a standardized system for diagnosing vehicle issues.
• Use an OBD-II scanner to verify the code.
• Inspect the transmission fluid level and condition.
• Check the wiring and connector for the temperature sensor.
• Replace the transmission fluid temperature sensor.
• Repair or replace damaged wiring or connectors.
• Refill or replace transmission fluid if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly check transmission fluid levels.
• Perform scheduled transmission maintenance.
• Inspect wiring harnesses for damage.
Sensor Issue
• Avoid heavy towing until the issue is resolved.
• Drive gently to prevent further damage.
Check vehicle warranty for coverage on transmission components.
This code has been more common in vehicles with higher mileage or those that have not had regular transmission maintenance.
Moderate – It should be addressed soon to prevent transmission damage.
Ignoring this code may lead to transmission failure, which could be dangerous.
• Engine at operating temperature
• Vehicle in drive
The transmission fluid temperature sensor is typically located inside the transmission or mounted on the transmission housing.
Q: Can I drive my car with a P187C code?
A: It's not recommended to drive for long periods with this code, as it may lead to transmission damage.
Q: How often should I check my transmission fluid?
A: It's a good practice to check your transmission fluid every 6 months or as recommended by your vehicle's manufacturer.
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.