Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a part that helps control the gears, and it's not working right. It's like a toy car that can't change speeds because something inside is stuck.
The P1887 code indicates a problem with the hydraulic pump relay circuit, which is responsible for controlling the hydraulic pump in the transmission.
The hydraulic pump relay circuit is responsible for supplying power to the hydraulic pump, which is crucial for maintaining the correct pressure in the transmission system. A malfunction in this circuit can lead to improper transmission operation.
• Transmission not shifting properly
• Check Engine Light illuminated
• Transmission slipping
• Faulty hydraulic pump relay
• Damaged wiring or connectors
• Faulty transmission control module (TCM)
Hydraulic Pump: A device that moves fluid through the transmission system to enable gear shifting.
Relay: An electrical switch that opens and closes under the control of another electrical circuit.
• Check for any other related trouble codes.
• Inspect the wiring and connectors for damage.
• Test the hydraulic pump relay for proper operation.
• Replace the faulty hydraulic pump relay.
• Repair or replace damaged wiring or connectors.
• Replace the transmission control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Malibu
• Pontiac Grand Prix
• Buick Regal
• Regular maintenance of the transmission system.
• Routine inspection of wiring and connectors.
• Timely replacement of worn-out components.
Transmission Control Issue
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for a thorough inspection.
Check with your vehicle manufacturer for specific warranty coverage on transmission components.
This code has been commonly reported in vehicles with aging transmission systems or those that have experienced electrical issues.
High – This issue can lead to severe transmission problems if not addressed promptly.
Driving with a malfunctioning transmission can be dangerous. Ensure repairs are made to maintain vehicle safety.
• Vehicle must be in a safe location.
• Engine should be off before performing electrical tests.
The hydraulic pump relay is typically located in the engine bay, near the transmission or in the fuse box.
Q: Can I drive my car with a P1887 code?
A: It's not recommended to drive with this code as it can cause further damage to the transmission.
Q: How can I reset the P1887 code?
A: You can reset the code using an OBD-II scanner, but it's important to fix the underlying issue first.
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.