P2808

Code

Generic P — Powertrain

Pressure Control Solenoid G Performance/Stuck Off

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 56 RU: 20

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Page language: EN

Causes

Open or shorted wiring between TCM/PCM and solenoid
Corroded, damaged, or loose connector at the solenoid or TCM
Failed or internally stuck pressure control solenoid (G)
Contaminated transmission fluid or debris blocking valve/port
Low or degraded transmission fluid
Faulty TCM/PCM or driver circuit

Symptoms

Transmission warning lamp (MIL/TCM) illuminated
Harsh, delayed, or erratic shifts
Transmission stuck in limp/limitation mode
Reduced engine power or lack of proper gear engagement
Unusual transmission noises or poor drivability

What to check

Retrieve and record freeze frame and all transmission codes with a scan tool
Scan live data: compare commanded solenoid state/pressure vs actual or related sensor readings
Visually inspect solenoid connector and wiring harness for damage, corrosion, or looseness
Back-probe solenoid connector to check for proper supply voltage and control signal
Measure solenoid coil resistance and compare to manufacturer spec
Check transmission fluid level and condition; look for metal debris on pan/magnet

Signal parameters

Coil resistance (typical range): ~10–50 ohms (varies by vehicle — consult service manual)
Supply voltage: battery nominal ~12 V present at solenoid harness (key ON)
Control signal: PWM from TCM/PCM, duty cycle 0–100% to vary pressure (frequency typically tens to a few hundred Hz)
Expected behavior: when commanded ON or higher duty, solenoid current/voltage and related line pressure should increase; when commanded OFF, pressure should drop
Exact resistance, voltage and PWM frequency vary by manufacturer — always verify with vehicle specifications

Diagnostic algorithm

Connect a professional scan tool. Read/record all DTCs and freeze frame data. Clear codes and attempt to reproduce.
Observe live data: monitor Pressure Control Solenoid G commanded value (duty) and any related pressure or shift data. Note mismatches between command and response.
With ignition ON (engine OFF), back-probe the solenoid connector: verify battery feed and check for PWM/control signal from TCM when commanded. If no control signal, suspect TCM or wiring.
Measure solenoid coil resistance with component disconnected. Compare to service spec. Infinite/open indicates open coil; very low indicates short.
Check continuity from the solenoid connector to the TCM pin for opens/shorts to ground/12V. Repair wiring or connector issues as found.
Inspect transmission fluid level and condition; drain pan and check for debris or metal on magnet if contamination suspected.
If wiring and control signals are correct but solenoid does not respond, remove and bench-test or swap with a known-good solenoid (if available) to confirm failure.
If bench test shows solenoid good, inspect valve body and bore for contamination or mechanical sticking; clean or rebuild as required.
If all wiring, solenoid and valve body check good, consider TCM driver fault — verify with manufacturer procedures and consider reflash or replacement.
After repair, clear codes and perform a full road test while monitoring live data to confirm normal operation.

Likely causes

Damaged wiring or poor connector contact at solenoid
Failed solenoid coil or internal mechanical seizure
Debris or clogged valve body passage affecting solenoid operation
Low/contaminated transmission fluid reducing solenoid effectiveness
Faulty TCM driver (less common)

Fault status

⚠️ Status

Pressure Control Solenoid G Performance/Stuck Off — TCM detected solenoid commanded on but no expected pressure/response. Possible wiring, connector, solenoid or valve body fault. Follow electrical and mechanical checks before replacing control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-4 hours