P27C0

Code

Generic P — Powertrain

Pressure Control Solenoid N Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 33 RU: 29

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Read freeze-frame/live data and note transmission and engine conditions when code set
Clear code and attempt to reproduce to verify consistency
Visual inspection of solenoid connector, pins, and wiring for damage, corrosion, or melting
Check battery voltage and chassis/body ground condition
Backprobe control circuit with scan tool commanded ON/OFF (active test) and observe response
Measure coil resistance at the solenoid connector with harness disconnected

Expected coil resistance: refer to vehicle-specific manual (typical range 5–50 ohms depending on design)
Idle/off voltage on control circuit: depends on driver type — may be near 0 V or near battery if high-side driver; verify factory spec
Commanded signal when ON: PWM duty cycle varies (0–100%), frequency typically tens to a few hundred Hz — check vehicle spec
Typical operating current: varies by solenoid — often 0.2–3 A; compare to factory values
Voltage seen at harness with key ON, engine OFF: approximately battery voltage (for supply) and expected driver reference per manufacturer

Retrieve and record codes, freeze-frame, and live data. Note if multiple solenoid or transmission codes are present.
Perform visual inspection of the solenoid connector and nearby harness for heat, corrosion, or physical damage. Repair obvious damage.
With harness connected, backprobe the control circuit and monitor voltage while commanding the solenoid ON/OFF via a capable scan tool. Observe whether the module attempts to drive the circuit and how the voltage behaves.
With ignition OFF, disconnect the solenoid connector and measure coil resistance at the solenoid. Compare to factory spec. If coil shows shorted (very low) or open (infinite), replace solenoid.
Check for short to B+: measure voltage between the control circuit and ground with ignition ON; if circuit reads near battery when it should be low, inspect wiring for damage or short to B+.
Check continuity between solenoid control pin and the TCM pin with harness disconnected; look for unintended continuity to battery or other circuits.
If wiring and solenoid check good, bench-test or substitute a known-good solenoid and re-test. If problem follows original solenoid, replace it.
If problem persists with known-good solenoid and wiring confirmed, suspect TCM/PCM driver failure; verify by substituting known-good module or having module bench-tested/reprogrammed per manufacturer procedures.
After repairs, clear codes and perform a road test and/or extended active tests to ensure code does not return.