P2818 on 2024-2025 GMC Sierra 1500 — Pressure Control Solenoid "H" Stuck On
1 vehicles · 1 makes · $900-$6,500 repair
Most Reported On
P2818 is an OBD-II diagnostic trouble code meaning “Pressure Control Solenoid "H" Stuck On.” SAE-defined generic powertrain/transmission code. Transmission pressure control solenoids meter line pressure to the clutch and band circuits so the transmission can change ratio smoothly. The transmission control module commands solenoid "H" off and then checks the resulting pressure, gear ratio and slip. P2818 sets when the module sees the hydraulic circuit still pressurised — the solenoid is stuck in the applied (on) state, either electrically or mechanically, so the element it feeds cannot release. The controller usually responds by forcing a failsafe or limp mode to protect the gearset. This code is most commonly reported on 2024-2025 GMC Sierra 1500, with repair costs ranging from $900 to $6,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
This is a powertrain code, so a basic OBD-II reader can read it. These read P2818.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple code reader for engine (P) codes on many compatible OBD-II vehicles. It does not support every vehicle or hybrid/EV application, and it does NOT read body, chassis or network codes; confirm exact-vehicle compatibility before buying.
- Read & clear engine (P) codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth scanner with a companion app that reads beyond the engine module — ABS, SRS and transmission — plus manufacturer-specific codes on many vehicles.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X V3.0 Elite OBD-II Scanner
by LAUNCH
Handheld scanner covering the four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level tablet with all-system coverage and bi-directional control, so you can command a module rather than only read it.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
What you can do yourself, and what needs a shop
Reading the code, clearing it, and watching whether it returns is a driveway job with the right scanner. These steps are not:
- Module programming or software updates — needs the manufacturer software or a J2534 pass-through with a paid subscription.
- Replacing a control module — most are VIN-programmed and immobilizer-registered, so a new one does nothing until it is coded to your car.
- Airbag/SRS component work — a stored fault can deploy a live device.
If the vehicle is still under warranty, check for an open recall or technical service bulletin before buying anything — the repair may already be covered.
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FAQ
What does P2818 mean?
P2818 stands for "Pressure Control Solenoid "H" Stuck On." SAE-defined generic powertrain/transmission code. Transmission pressure control solenoids meter line pressure to the clutch and band circuits so the transmission can change ratio smoothly. The transmission control module commands solenoid "H" off and then checks the resulting pressure, gear ratio and slip. P2818 sets when the module sees the hydraulic circuit still pressurised — the solenoid is stuck in the applied (on) state, either electrically or mechanically, so the element it feeds cannot release. The controller usually responds by forcing a failsafe or limp mode to protect the gearset.
What are the most common causes of P2818?
The most common causes of P2818 are: Pressure control solenoid stuck open/on, or its valve-body bore worn so the valve will not return, Valve body wear, debris or varnish holding the control valve in position, Low, burnt, overheated or contaminated transmission fluid; clogged filter, Open, shorted or chafed solenoid wiring, or a corroded internal transmission connector / pass-through, Failed transmission control module or internal control solenoid assembly, Worn clutch material circulating debris through the hydraulic circuit. The specific cause varies by vehicle.
How much does it cost to fix P2818?
Repair costs for P2818 range from $900 to $6,500, depending on the vehicle and root cause.
Which vehicles are affected by P2818?
Au7o has documented P2818 across 1 vehicle models from 1 manufacturers: GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.