Code
P08D9
Generic
P — Powertrain
Shift Solenoid K Intermittent
Views:
UK: 21
EN: 33
RU: 28
AI status
Completed
Completed
100%
Causes
- Damaged, corroded, or loose connector at the solenoid
- Wiring harness open, shorted, or chafed between solenoid and PCM/TCM
- Poor or intermittent ground at transmission or PCM
- Faulty shift solenoid (internal intermittent failure)
- Low, contaminated, or degraded transmission fluid causing solenoid sticking
- PCM/TCM internal fault or intermittent driver output
Symptoms
- Check Engine / Transmission warning lamp illuminated intermittently
- Erratic or harsh shifting, gear hunting or delayed engagement
- Transmission may go into limp/inverted gear mode intermittently
- Noisy or inconsistent shift feel during drive cycles
- Code returns intermittently after clearing
What to check
- Scan for stored/freeze-frame data and note when the code sets (conditions, RPM, gear)
- Perform a visual inspection of transmission fluid level and condition
- Inspect solenoid connector and wiring for corrosion, looseness, chafing and bent pins
- Wiggle test wiring and connectors while monitoring live data for the solenoid
- Backprobe solenoid control and ground circuits; check for proper voltage and continuity to PCM/TCM
- Measure solenoid coil resistance and compare to manufacturer spec
Signal parameters
- Solenoid coil resistance: typically a few ohms to a few tens of ohms (check factory spec for exact value)
- Command signal: PWM duty cycle 0–100% from PCM/TCM when modulating solenoid
- Drive voltage: usually switched 0–12 V depending on command state
- Typical PWM frequency: tens to a few hundred Hz (varies by manufacturer)
- Current draw: often 0.2–2 A during activation (varies by design)
Diagnostic algorithm
- Retrieve all codes and freeze-frame data with a capable scan tool; note when the intermittent occurs.
- Visually inspect transmission fluid level and condition; correct if low or contaminated and retest.
- Inspect solenoid K connector and harness for damage, corrosion or poor seating; repair any issues and retest.
- Backprobe the solenoid connector and monitor command (PWM), feed voltage and ground while operating or during a road test; wiggle harness to reproduce intermittent.
- Measure coil resistance with the connector disconnected; compare to factory specification. If out of spec or intermittent, replace solenoid.
- Check continuity between solenoid connector and PCM/TCM pin for opens/shorts; repair wiring as needed.
Likely causes
- Corroded/loose connector or terminal at the solenoid
- Damaged wiring harness (intermittent break or short when moving)
- Failed solenoid that works intermittently
- Low or dirty transmission fluid causing sticking
Fault status
Status
Intermittent electrical/hydraulic fault detected on transmission shift solenoid K circuit. PCM/TCM observed inconsistent response to solenoid command; failure stored as intermittent.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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