P0747: How to Diagnose & Fix — Pressure Control Solenoid Stuck On
6 vehicles · 3 makes · $300-$6,500 repair
How to diagnose and fix P0747: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
GMC Sierra 1500 · 2024–2025
2024-2025 Sierra 1500 trucks with the 10-speed automatic (5.3L L84, 6.2L L87 and 3.0L Duramax LZ0) are failing at very low mileage with a stuck valve-body solenoid. Symptoms: a 'Service Transmission' or 'Service Transmission — Unable to Shift Soon' message, sudden hard/slamming shifts, slipping, complete loss of reverse (owners have had to push the truck out of parking spaces), and default limp operation limited to fifth gear and reverse. Several complaints report the failure occurring under 7,000 miles. NHTSA reports cite DTC P2818 (pressure control solenoid) and P0747/P0700. The situation is compounded by a national valve-body backorder — owners document 50-plus days and in some cases over a year waiting for the part, with GM sometimes authorizing a full transmission replacement instead. Complaint ODI numbers include 11756150, 11754176, 11748050, 11744152, 11739083, 11727368, 11721983, 11694617, 11684139, 11680422, 11680435, 11654431, 11644523, 11634982 (2024) and 11711937 (2025).
How to Fix
GM issued TSB #25-NA-255 (Sept 22, 2025) directing technicians to REPAIR rather than replace the valve body on 2021-2024 Silverado/Sierra 1500 and full-size SUVs with the 10L80/10L90 when P0747 is set. The repair installs a new steel Feed Limit Low Valve, a higher-tension Feed Limit Valve Spring, and a new valve body spacer plate with gasket; it requires at least 7,000 miles on the vehicle and must not be used if there is significant clutch debris in the pan. No solenoid characterization programming is needed afterward. Ask the dealer specifically for the 25-NA-255 repair kit rather than accepting a backordered complete valve body. Repairs are covered under the 5yr/60k powertrain warranty for these model years. If clutch material is present, a transmission replacement is the correct call.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (2)
Cadillac XT5 · 2023–2024
GM bulletin 20-NA-136 (May 2024) gives a diagnostic and repair strategy for 9T65 nine-speed automatics (RPO M3W/M3V) in 2021-2024 XT5 and related GM crossovers that set transmission DTCs with less than 12,000 miles on the odometer. It points technicians to PIP5974 for a clutch snap-ring pop-out that can set P0746/P0747. Depending on which solenoid-related codes reproduce on a road test and on fluid condition, the bulletin calls for replacing the solenoid body and/or control valve body, and for removing the transmission to inspect the clutches when the fluid is dark and burnt. The earlier replacement pilot program has ended.
Common Symptoms
- Check engine light with transmission DTCs (such as P0746/P0747) at low mileage
- Harsh, soft or delayed shifts or slipping
How to Fix
Have a qualified technician confirm the transmission RPO and current GM guidance before choosing a repair. Bulletin 20-NA-136 calls for recording all DTCs, checking fluid level/condition and line pressure, and a road test; its replacement pilot has ended, so it does not mandate a replacement transmission. P0747 can also occur at shutdown without an internal mechanical fault. Repair scope and warranty eligibility must be established for the diagnosed condition. Ask Cadillac to check the VIN for the separate 23V172 sun-gear recall.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
Chevrolet Silverado 1500 · 2007–2019
P0700 is not a specific fault by itself — it is an umbrella/MIL-request code the ECM stores whenever the transmission control module (TCM) detects an internal transmission problem and asks the ECM to turn on the check-engine light. On the Silverado 1500 it almost always appears alongside more specific companion codes, and the underlying failure follows two dominant, well-documented patterns depending on the transmission. On trucks with the 6L80 six-speed automatic (many 5.3L and 6.2L V8 trucks, plus 2014-onward 4.3L V6 trucks; 2015-onward 6.2L trucks use the 8L90 eight-speed instead), the internal TEHCM (Transmission Electro-Hydraulic Control Module — GM's combined valve body, solenoids, pressure switches, and TCM in a single pan-mounted unit) develops internal circuit-board/solenoid faults from heat and fluid degradation, throwing P0700 together with codes like P0796, P0777, P0842, or P0973 and dropping the truck into limp mode. On older/base trucks with the 4L60E four-speed (2007-2013 4.3L/4.8L), the same P0700 is typically triggered by a failed shift solenoid (P0753/P0758) or a faulty internal mode switch. Because P0700 is a stored 'passenger' code, a scan tool that can talk to the TCM (not just a basic reader) is required to pull the specific sub-code that identifies the actual failed component.
Common Symptoms
- Check engine light on with P0700 stored
- Transmission stuck in limp mode / limited to one gear (often 3rd or 5th)
- Harsh or delayed shifts
- Transmission fails to shift or slips
- Torque converter clutch not locking up / shudder
- No movement or won't shift out of park in severe cases
How to Fix
Do NOT replace parts off the P0700 alone. Use a bidirectional/TCM-capable scan tool to read the companion codes stored in the transmission controller and verify transmission fluid level and condition first (low or burnt DEXRON-VI fluid alone can trigger the chain). For 6L80 trucks, a failed internal TEHCM is confirmed by multiple simultaneous solenoid/pressure codes; the fix is to drop the pan and replace the TEHCM, which MUST then be programmed to the vehicle's VIN with GM calibration files before the truck will start or shift correctly (ordering the OEM unit by the last 8 VIN digits can yield a plug-and-play unit needing no fast-adapt relearn). For 4L60E trucks, replace the specific failed shift solenoid or internal mode switch identified by the sub-code. Repair the wiring/connectors to the TCM if corrosion is found. On 2020-2022 Silverado 1500s with the diesel engine, a failing transmission control valve is covered by Safety Recall N242454440 (NHTSA 24V-797) and its related special coverage — check the VIN with a dealer for a free repair.
Sources for this issue (4)
Cadillac XT6 · 2024–2024
Cadillac CT5 · 2020–2021
Find P0747 by make
Browse every documented model and issue for your make.
P0747 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0747 mean?
P0747 stands for "Pressure Control Solenoid Stuck On." This transmission code means the pressure control solenoid 'A' is stuck in the on (or fully applied) position, or its circuit behaves as if permanently energized. This solenoid regulates hydraulic line pressure that controls clutches and shift feel inside the automatic transmission. When it stays on, line pressure can't be modulated properly, leading to harsh shifts, slipping, overheating, or the transmission being stuck in a gear or limp mode. It points to the solenoid, its wiring, or a hydraulic/contamination problem in the valve body.
What are the most common causes of P0747?
The most common causes of P0747 are: Stuck or failed pressure control solenoid, Dirty or contaminated transmission fluid blocking the valve, Debris stuck in the valve body bore, Shorted or chafed solenoid wiring, Corroded or loose solenoid connector, Low or degraded transmission fluid, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P0747?
Repair costs for P0747 range from $300 to $6,500, depending on the vehicle and root cause.
Which vehicles are affected by P0747?
Au7o has documented P0747 across 6 vehicle models from 3 manufacturers: Cadillac, Chevrolet, GMC.
Join 600+ people using Au7o to better understand their vehicles.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.