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 saying that there is a problem with the power supply to the transmission control system. It's like when a toy doesn't work because the batteries aren't connected properly.
The P0887 code indicates that the power relay control circuit for the Transmission Control Module (TCM) is experiencing a high voltage condition.
The Transmission Control Module (TCM) relies on a power relay to receive the necessary voltage to function. When the voltage in the control circuit is higher than expected, the TCM may not operate correctly, leading to the P0887 code being triggered.
• Check Engine Light is on
• Transmission may not shift properly
• Vehicle may enter limp mode
• Erratic transmission behavior
• Faulty TCM power relay
• Wiring issues such as short circuits or open circuits
• Faulty TCM
• Corroded or damaged connectors
TCM: Transmission Control Module
Relay: An electrical switch that opens and closes under the control of another electrical circuit
• Use an OBD-II scanner to confirm the code.
• Inspect the TCM power relay for proper operation.
• Check wiring and connectors for damage or corrosion.
• Test the TCM for faults.
• Replace the faulty TCM power relay.
• Repair or replace damaged wiring or connectors.
• Replace the TCM if it is found to be faulty.
• OBD-II scanner
• Multimeter
• Screwdriver set
$100 - $500
Moderate
• Dodge Ram
• Chrysler Town & Country
• Jeep Grand Cherokee
• Regularly inspect and maintain electrical connections.
• Ensure the battery and charging system are in good condition.
• Avoid exposure to moisture in the engine bay.
Electrical Circuit Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Avoid driving long distances until the issue is resolved.
Check with the vehicle manufacturer for warranty coverage on powertrain components.
This code has been reported in vehicles with electrical system issues, particularly in models with known TCM relay problems.
Moderate – The vehicle may still be drivable, but transmission issues can worsen if not addressed.
Driving with transmission issues can be unsafe and may lead to further damage. Always address warning lights promptly.
• Vehicle in park with engine running
• Transmission at normal operating temperature
The TCM power relay is typically located in the engine bay, often within the fuse box.
Q: Can I drive with a P0887 code?
A: It's not recommended to drive for long distances as it may cause transmission issues.
Q: How can I reset the P0887 code?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
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