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 detected that a part of the transmission called 'Clutch B' is spinning too fast, like when a toy top spins out of control.
This code indicates that the motor controlling Clutch B in the transmission is spinning faster than expected, which could lead to transmission issues.
The P28D8 code is triggered when the transmission control module (TCM) detects that the motor responsible for engaging Clutch B is operating at a speed beyond its normal range. This could be due to a malfunction in the motor itself, a problem with the clutch, or an issue with the TCM.
• Transmission slipping
• Unusual noises from the transmission
• Check Engine Light illuminated
• Faulty clutch motor
• Transmission control module (TCM) malfunction
• Wiring or electrical issues in the clutch motor circuit
Transmission Control Module (TCM): A computer that controls the operation of the transmission.
Clutch: A device that engages and disengages the power transmission from the driving shaft to the driven shaft.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connections to the clutch motor.
• Test the clutch motor for proper operation.
• Repair or replace faulty wiring or connectors.
• Replace the clutch motor if defective.
• Reprogram or replace the TCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$300 - $800
Moderate
• Vehicle 1
• Vehicle 2
• Vehicle 3
• Regular transmission maintenance
• Ensure proper fluid levels
• Address transmission issues promptly
Transmission Issue
• Avoid driving aggressively until the issue is resolved.
• Have the vehicle inspected by a professional mechanic.
Transmission components may be covered under the powertrain warranty. Check with your vehicle manufacturer.
This code is relatively uncommon and typically associated with newer vehicles with advanced transmission systems.
Moderate – It is recommended to address this issue soon to prevent further transmission damage.
Ignoring transmission issues can lead to safety hazards and more costly repairs.
• Vehicle at operating temperature
• Driving under normal conditions
The clutch motor is located within the transmission housing.
Q: Can I drive with a P28D8 code?
A: It's not recommended to drive with this code active, as it can lead to further transmission damage.
Q: How do I reset the P28D8 code?
A: You can reset the code with an OBD-II scanner, but it's important to fix the underlying issue first.
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