Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's computer is saying that it can't read the pressure of the transmission fluid properly because something is wrong with the sensor or its wiring.
The transmission fluid pressure sensor/switch E is reporting a lower than expected voltage to the engine control module (ECM), indicating a potential issue with the sensor or its circuit.
The P0989 code is triggered when the ECM detects a low voltage signal from the transmission fluid pressure sensor/switch E. This sensor monitors the hydraulic pressure in the transmission, which is crucial for proper gear shifting and transmission operation. A low circuit condition could be due to a faulty sensor, a wiring issue, or a problem with the ECM.
• Check Engine Light is on
• Erratic or harsh shifting
• Transmission slipping
• Faulty transmission fluid pressure sensor/switch E
• Damaged or corroded wiring or connectors
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Scan the vehicle for codes and note any other related codes.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensor for proper operation using a multimeter.
• Replace the faulty transmission fluid pressure sensor/switch E.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly check and maintain transmission fluid levels.
• Inspect wiring and connectors for damage during routine maintenance.
• Ensure regular transmission service intervals are followed.
Sensor Issue
• Address the issue promptly to avoid further transmission damage.
• Consult a professional mechanic if unsure about the repairs.
Check with your vehicle's manufacturer warranty for coverage on transmission components.
This code has been associated with transmission issues in vehicles with high mileage or poor maintenance history.
Moderate – Addressing this issue soon can prevent more severe transmission problems.
Driving with transmission issues can lead to unsafe driving conditions. Address the issue promptly.
• Vehicle must be in a safe environment to test transmission functions.
• Ensure the vehicle is at operating temperature for accurate diagnosis.
The transmission fluid pressure sensor is typically located inside the transmission housing.
Q: Can I drive with a P0989 code?
A: It's not recommended to drive for extended periods with this code as it may lead to further transmission damage.
Q: How do I reset the Check Engine Light after repairs?
A: Use an OBD-II scanner to clear the code after ensuring the issue is resolved.
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.