Code
P08DD
Generic
P — Powertrain
Shift Solenoid K Control Circuit/Open
Views:
UK: 21
EN: 26
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or intermittent wiring in the solenoid K control circuit
- Poor, corroded, or disconnected connector at the solenoid or TCM/PCM
- Failed shift solenoid K (coil open)
- Short to ground or short to battery in the solenoid circuit
- Blown fuse or faulty relay powering transmission solenoids
- Damaged or contaminated valve body affecting the solenoid
Symptoms
- Check Engine / Malfunction Indicator Lamp (MIL) illuminated
- Transmission stuck in one gear or limited (limp) mode
- Harsh, delayed, or no shifts related to gear changes controlled by solenoid K
- Transmission may slip or fail to engage certain gears
- Stored freeze frame data and repeatable fault on certain conditions
- Possible rough idle or abnormal drivability if PCM/TCM reduces functionality
What to check
- Scan with a capable tool: read P08DD and any related codes, check freeze frame and live data
- Visual inspection of wiring harness, connectors, and valve body area for damage, corrosion, or fluid intrusion
- Wiggle test connector/wiring while monitoring live data to reproduce the fault
- Check fuses and relays that supply transmission solenoids and TCM/PCM power/grounds
- Measure resistance of solenoid K at the connector with harness disconnected (compare to specification)
- Backprobe solenoid connector while commanding the solenoid ON/OFF to verify supply voltage, driver output, and ground
Signal parameters
- Solenoid coil resistance (typical): approx. 6–40 ohms (varies by vehicle/manufacturer) — consult OEM spec
- Supply voltage when commanded ON: near battery voltage (approx. 12V) for direct-drive solenoids
- Driver output for PWM solenoids: pulse width/duty cycle 0–100% at frequencies commonly 50–250 Hz (varies by design)
- Open-circuit indication: infinite / very high resistance when measured across solenoid terminals
- Short-to-ground indication: near 0 ohms between solenoid positive and ground
Diagnostic algorithm
- Connect a scan tool, record freeze frame and live data, then clear codes and attempt to re-create the fault to confirm it’s current.
- Perform a visual inspection of the transmission harness, connectors, and valve body for fluid contamination, damage, or loose pins.
- Inspect power and ground circuits: check transmission/TCM power supply fuses and relays and verify good grounds.
- Unplug the solenoid connector and measure solenoid coil resistance. If open or out of spec, replace solenoid.
- With harness connected, backprobe the solenoid connector. Command the solenoid ON/OFF and measure for proper supply voltage and driver signal (or PWM waveform) from the TCM/PCM.
- If voltage or waveform is missing, check continuity from the solenoid connector to the TCM/PCM pin. Repair any open or shorted wiring and secure/replace corroded connectors.
- If wiring and connector are good but no correct driver output from TCM/PCM, consider replacing the TCM/PCM or consult manufacturer procedures for internal driver testing.
- After repairs or component replacement, clear codes and perform a test drive under the same conditions that set the code to verify the fault is resolved.
- If intermittent, perform wiggle tests and extended road test; consider replacing suspect harness sections or connectors if intermittent continuity is found.
Likely causes
- Damaged/chafed wire or broken pin in the solenoid connector
- Corroded connector terminals causing open circuit
- Failed solenoid coil (open circuit)
- Poor ground or missing power feed to the solenoid
- Contaminated valve body or seized solenoid
- Intermittent TCM/PCM driver fault (less common)
Fault status
Status
Shift Solenoid K Control Circuit/Open detected — open or abnormal electrical condition in the solenoid K circuit. Inspect wiring, connectors, fuse/relay, and solenoid; verify driver output at the TCM/PCM before replacing components.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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