Code
P27B0
Generic
P — Powertrain
Pressure Control Solenoid K Data Incompatible
AI status
Completed
Completed
100%
Causes
- Faulty pressure control solenoid K (stuck, shorted, open, or internal failure)
- Open, short or high resistance in solenoid wiring or connectors
- Poor connector contact, corrosion, or damaged pins at the solenoid or TCM
- Low or intermittent supply voltage or poor ground to the solenoid circuit
- Faulty transmission control module (TCM) or internal software/firmware error
- Communication bus error (CAN/LIN) or data corruption between modules
Symptoms
- Transmission fault indicator (check engine/AT lamp) illuminated
- Harsh, delayed, or incorrect shifting
- Transmission may enter limp/reduced gear mode
- Reduced drivability or loss of expected torque management
- Other transmission-related fault codes or multiple solenoid codes stored
What to check
- Read and record freeze-frame and all stored transmission codes with a capable scan tool
- Check for technical service bulletins (TSBs) or software updates affecting solenoid K or TCM
- Visually inspect solenoid connector and wiring harness for damage, corrosion, or loose pins
- Compare commanded duty/current for Solenoid K vs actual reported values on a scan tool
- Measure solenoid resistance (cold) and compare to manufacturer spec
- Verify supply voltage and ground at the solenoid connector with key on/engine off and during operation
Signal parameters
- Commanded duty cycle or PWM (%) for Pressure Control Solenoid K
- Measured solenoid current (A) or voltage response (V) under command
- Solenoid coil resistance (ohms) at ambient temperature
- Supply voltage to solenoid (B+ voltage) and ground continuity (V)
- Transmission fluid temperature (°C/°F) during testing
- TCM reported pressure feedback or calculated line pressure (kPa/psi)
Diagnostic algorithm
- Retrieve freeze-frame data and all transmission/engine codes. Note conditions (temp, RPM, gear).
- Check for relevant TSBs or required TCM software updates. If applicable, update/reflash TCM per OEM.
- Visually inspect solenoid K connector and harness for damage, corrosion, or chafing; repair as needed.
- With harness disconnected, measure coil resistance of solenoid K and compare to spec. Replace solenoid if out of range.
- Back-probe connector with key ON and command solenoid K ON via bi-directional scan tool; verify duty cycle/voltage/current and that solenoid responds mechanically (if safe to do so).
- Check supply voltage and ground at the connector during activation; repair any low-voltage or poor-ground issues.
- Wiggle test harness while monitoring live data for intermittent faults. Repair broken wires or poor crimps.
- If wiring/resistor/voltage checks good but data still incompatible, swap with a known-good identical solenoid (if available) to confirm solenoid vs module.
- Inspect related hydraulic circuits and fluid condition; replace fluid/filter if contaminated and repeat tests.
- If fault persists and vehicle wiring & solenoid verified good, consider TCM/module fault — verify programming/calibration and replace only as last step following OEM procedures.
- Clear codes and perform road test under the same conditions to confirm repair.
Likely causes
- Wiring/connectors to solenoid K (corrosion, broken wire, poor pin contact)
- Failed solenoid K (electrical or mechanical internal failure)
- Low supply voltage or poor ground at the solenoid circuit
- TCM software calibration mismatch or recent module swap without reprogramming
- Intermittent communication fault on vehicle network
Fault status
Status
Pressure Control Solenoid K data incompatible — check solenoid, wiring, supply/ground, and TCM communication/software.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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