P2814

Code

Generic P — Powertrain

Pressure Control Solenoid G Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 14 EN: 31 RU: 23

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Page language: EN

Causes

Open or high-resistance wiring in solenoid G control circuit
Short to ground in the solenoid G control wire
Corroded, loose or damaged connector at the solenoid or TCM
Failed pressure control solenoid G (coil open or intermittent)
Faulty TCM/ECM output driver
Blown fuse or poor battery/ignition power/ground

Symptoms

Transmission fault lamp (MIL) or TCM lamp illuminated
Harsh, delayed or incorrect gear shifts
Transmission may enter limp/low‑gear mode
Unusual transmission noise, slipping or failure to engage gears
Stored or intermittent fault codes related to transmission solenoids

What to check

Read and record freeze frame data and all stored/transient codes with a scan tool
Visually inspect wiring and connectors at the solenoid and TCM for damage, corrosion or contamination
Check fuses and ignition/switched 12V supply for the transmission control system
Backprobe the solenoid connector while commanding the solenoid with a scan tool and observe voltage/current
Measure coil resistance at the solenoid (unplugged) and compare to specification
Perform wiggle/pressure tests on wiring while monitoring live data for intermittent faults

Signal parameters

Control type: typically PWM drive from TCM (pulse-width modulated ground or high-side driver)
Typical control voltage when inactive: ~battery voltage (depends on driver design)
Typical commanded voltage/current when active: varies by vehicle — driver may switch to ground or supply; expect pulsed voltage up to battery (0–12 V)
Typical PWM frequency range (vehicle-dependent): roughly 50–500 Hz
Typical coil resistance (vehicle-dependent): often ~10–50 Ω — consult vehicle service data for exact spec

Diagnostic algorithm

Retrieve and record all codes and freeze-frame data with a capable scan tool; note conditions when fault set
Clear codes and perform a road or electrical cycle to reproduce fault while monitoring solenoid G command and actual pressure/shift parameters
Visually inspect solenoid G connector, harness and TCM connector for corrosion, bent pins, or damage; repair as required
With ignition on (engine off) backprobe the solenoid control pin and measure voltage while commanding the solenoid ON/OFF from the scan tool; note if command appears but actual voltage is low or missing
Unplug the solenoid and measure coil resistance to ground and between terminals; compare to manufacturer spec (open/infinite or outside spec indicates bad solenoid)
Perform a voltage drop test on the supply and ground circuits for the solenoid while operating the circuit; check for short to ground on control wire if voltage is low
If wiring and solenoid check good, test TCM driver output by measuring switching waveform or substitute known-good TCM or perform bench tests per manufacturer procedure
Repair or replace faulty wiring, connector, fuse, or solenoid. Clear codes and retest to confirm proper operation and that code does not return

Likely causes

Damaged/loose connector at solenoid or TCM
Open or shorted control wire to ground
Failed solenoid coil
Corroded terminal or poor ground

Fault status

⚠️ Status

P2814 - Pressure Control Solenoid G Control Circuit Low: Low voltage or open/short detected on the solenoid G control circuit. Inspect wiring, connector, solenoid and TCM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours