P2756

Code

Generic P — Powertrain

Torque Converter Clutch Pressure Control Solenoid

Brand: Generic

Type: P — Powertrain

Views: UK: 33 EN: 45 RU: 32

AI status

Completed

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Page language: EN

Causes

Open or short in TCC solenoid wiring or connector
Corroded, loose or damaged connector pins
Failed TCC pressure control solenoid
Low, dirty, or incorrect automatic transmission fluid (ATF)
Internal transmission valve body or hydraulic fault (sticking valve/cavity contamination)
Blown fuse or faulty relay supplying solenoid circuit

Symptoms

Check Engine / Transmission warning lamp illuminated
Torque converter clutch does not lock or unlock as commanded
Transmission slip, harsh engagement, or delayed lockup
Elevated engine RPM at cruising speeds / reduced fuel economy
Possible transmission limp-in/reduced shift functionality
Shudder or vibration during torque converter engagement

What to check

Read and record freeze-frame and live data with a scan tool (TC C status, commanded duty cycle, actual pressure / TCC apply %)
Inspect transmission fluid level and condition (smell, color, particulate)
Visually inspect solenoid connector and wiring for damage, corrosion, pins pushed out or water intrusion
Check fuse(s) and relay(s) for solenoid power feed
Measure solenoid coil resistance with multimeter and compare to specification
Perform back-probing or oscilloscope check of solenoid command signal (PWM duty cycle and frequency) while driving or commanded by scanner

Signal parameters

Typical solenoid coil resistance: commonly ~10–40 Ω (varies by vehicle) — open if >> specified; short if
Supply voltage at connector: battery voltage (approx. 12V) on power feed circuit
Control signal: PWM duty cycle 0–100% (command varies with load/speed); frequency typically tens to a few hundred Hz (manufacturer-specific)
Fault thresholds: open-circuit (OL) or short-to-ground/battery reported by TCM when resistance/voltage outside expected range — consult vehicle service data for exact values

Diagnostic algorithm

Retrieve codes and live data, note engine/trans mission conditions when code set. 2) Inspect ATF level and condition; if low/contaminated, correct before continuing. 3) Visually inspect wiring and connector at TCC solenoid for corrosion, damage or loosened terminals. 4) Check related fuses/relays and verify power feed at the solenoid connector (battery voltage on power circuit). 5) With ignition off, measure solenoid coil resistance; compare to factory spec. 6) Turn key on/run engine and back-probe control circuit; observe voltage and PWM duty cycle with scan tool or oscilloscope while commanding TCC on/off. 7) Check continuity between solenoid connector and TCM and for shorts to ground/battery. 8) If wiring and control signal are good but solenoid out of spec or does not operate when energized, replace solenoid. 9) If solenoid and harness test good but issue persists, inspect valve body/hydraulic circuits or consider TCM fault and follow module-specific tests. 10) Clear codes and perform road test to verify repair.

Likely causes

Wiring connector corrosion or poor pin contact
Failed/shorted TCC pressure control solenoid
Contaminated ATF causing solenoid/valve sticking
Open circuit (broken wire) to solenoid

Fault status

⚠️ Status

Stored DTC P2756 — Torque Converter Clutch Pressure Control Solenoid. The transmission control module detected abnormal electrical or performance behavior in the TCC pressure control solenoid circuit or pressure control function. May disable TCC operation or trigger limp mode until fault is addressed.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours