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 your car's computer has detected a problem when trying to shift from 5th gear to 4th gear. It's like when you're trying to change gears on your bike, but the chain gets stuck.
The vehicle's transmission control module (TCM) has identified an issue when attempting to shift from 5th gear to 4th gear.
P1864 is a diagnostic trouble code (DTC) indicating a malfunction in the transmission system specifically related to the 5th to 4th gear shift. The TCM monitors the gear shift process and detects any discrepancies in the expected operation, such as delays or failures to engage the gear properly.
• Harsh or delayed shifting
• Transmission stuck in one gear
• Illuminated check engine light
• Faulty shift solenoid
• Transmission fluid issues
• Wiring problems in the transmission circuit
TCM: Transmission Control Module
DTC: Diagnostic Trouble Code
• Check transmission fluid level and condition
• Inspect wiring and connectors for damage
• Test the shift solenoid operation
• Replace faulty shift solenoid
• Repair or replace damaged wiring
• Flush and refill transmission fluid
• OBD-II scanner
• Multimeter
• Transmission fluid pump
$200 - $600
Moderate
• Ford Explorer
• Chevrolet Silverado
• Dodge Ram
• Regular transmission fluid changes
• Routine transmission inspections
• Avoiding aggressive driving habits
Transmission Issue
• Avoid driving at high speeds until repaired
• Have the vehicle inspected by a professional
• Monitor for any new symptoms
Check with the vehicle manufacturer for any applicable powertrain warranty coverage.
P1864 has been a common issue in vehicles with automatic transmissions, particularly in models with high mileage or those that have not had regular maintenance.
Moderate – Should be addressed soon to avoid further transmission damage.
Driving with transmission issues can lead to unsafe driving conditions. It is recommended to address this issue promptly.
• Vehicle at operating temperature
• Driving conditions that require gear shifts
The transmission shift solenoids are located within the transmission housing.
Q: Can I drive with a P1864 code?
A: It's not recommended to drive for long periods with this code, as it can lead to further transmission damage.
Q: Will a transmission fluid change fix the P1864 code?
A: A fluid change might help if the fluid is low or dirty, but it may not resolve the issue if the solenoid or wiring is faulty.
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