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DTC codes / P08xx · Transmission / P08D5

P08D5Shift Solenoid K

P08D5 indicates that the transmission control module has detected an electrical fault in the circuit for shift solenoid K, which is one of the solenoids that controls hydraulic pressure for gear shifting. The computer monitors the solenoid's electrical current and sets this code when the circuit is open, shorted, or out of expected range.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaTransmission

Symptoms you may notice

  • Check engine light or transmission warning light illuminated
  • Harsh or delayed gear shifts, or the transmission may fail to shift into certain gears
  • Transmission may enter limp mode and stay in a single gear
  • Slipping or flaring during acceleration
  • Often no symptoms besides the warning light, especially if the fault is intermittent

Common causes, most likely first

  1. Faulty shift solenoid K itself, such as a burned coil or stuck plunger
  2. Damaged or corroded wiring or connector at the solenoid or transmission harness
  3. Transmission fluid contamination or low fluid level causing solenoid malfunction
  4. Failed transmission control module or internal circuit board
  5. Valve body wear or debris blocking the solenoid's hydraulic circuit
  6. Poor ground connection for the solenoid circuit

How to diagnose and fix it

  1. Check transmission fluid level and condition; top off or replace if contaminated
  2. Inspect the solenoid K connector and wiring for corrosion, chafing, or loose pins
  3. Measure resistance across the solenoid K terminals and compare to manufacturer specification
  4. Test the solenoid circuit for power and ground with a multimeter or test light
  5. If resistance is out of spec, replace shift solenoid K and clear the code
  6. If the circuit tests good, inspect the valve body for debris or wear that could affect solenoid operation
  7. As a last step, diagnose or replace the transmission control module if all other checks pass

Before you replace shift solenoid K

  • A low or dirty transmission fluid level can cause solenoid K to set a code even when the solenoid itself is healthy, so always check fluid first.
  • Intermittent wiring faults at the transmission connector often mimic a failed solenoid, so wiggle-test the harness while watching live data.
  • Some vehicles use solenoid K for multiple functions, so a failure may cause different symptoms depending on which gear is engaged.
  • Clearing the code without repairing the root cause will usually result in the code returning within a few drive cycles.
  • A faulty transmission control module can command the solenoid incorrectly, setting a circuit code even though the solenoid tests good.

Can I keep driving with P08D5?

You can usually drive the vehicle to a repair shop if the transmission still shifts, but avoid heavy acceleration or towing. If the transmission is in limp mode or slipping severely, stop driving to prevent further damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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