Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the car's computer not getting power correctly. It's like when a toy doesn't work because the batteries are loose.
The Transmission Control Module (TCM) isn't receiving the correct power signal from the power relay.
The P0888 code is set when the TCM detects a malfunction in the power relay sense circuit. This circuit is responsible for providing the TCM with the necessary power to operate. If the relay fails or the circuit is open or shorted, the TCM may not function properly.
• Check Engine Light is on
• Transmission may not shift properly
• Vehicle may go into 'limp' mode
• Poor fuel economy
• Faulty TCM power relay
• Open or shorted wiring in the power relay circuit
• Corroded or damaged connectors
• Faulty TCM
TCM: Transmission Control Module
Relay: An electrically operated switch
• Use an OBD-II scanner to confirm the code.
• Inspect the TCM power relay and related wiring for damage.
• Check the connectors for corrosion or damage.
• Test the relay for proper operation.
• Replace the faulty TCM power relay.
• Repair or replace damaged wiring or connectors.
• Clear the code and test drive the vehicle.
• Replace the TCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Dodge Caravan
• Chrysler Town & Country
• Jeep Grand Cherokee
• Regularly inspect electrical connections.
• Keep the vehicle's electrical system clean and dry.
• Perform routine maintenance checks.
Electrical Circuit Issue
• Avoid driving long distances until the issue is fixed.
• Consult a professional mechanic if unsure about repairs.
Check if the vehicle's powertrain warranty covers electrical components.
This code has been associated with faulty relays and wiring issues in vehicles with high mileage.
Moderate – Should be addressed soon to avoid transmission issues.
Driving with this code may cause transmission problems, which could lead to unsafe driving conditions.
• Vehicle in park with engine running.
• Use a scanner to monitor TCM power relay operation.
The TCM power relay is typically located in the engine compartment fuse box.
Q: Can I drive with the P0888 code?
A: It's not recommended as it may lead to transmission issues.
Q: How do I reset the P0888 code?
A: After repairs, use an OBD-II scanner to clear the code.
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