P0747 on 2020-2024 Cadillac XT5: Pressure Control Solenoid 'A' Stuck On Causes and Fixes

What's Unique About the 2020-2024 Cadillac XT5

While P0747 on many vehicles points to a faulty solenoid, on the 2020-2024 Cadillac XT5 and its platform mates using the GM 9T60/9T65 transmission, it is frequently a symptom of a deeper mechanical failure. General Motors has issued multiple Technical Service Bulletins (TSBs) for this platform, explicitly linking this code to internal issues like out-of-round snap rings in the 1-2-3-4-5-6 clutch assembly. These bulletins warn that simply replacing the solenoid or valve body will not fix the root cause, making proper diagnosis critical to avoid unnecessary, costly, and ineffective repairs.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Vehicle will not move when placed in Drive or Reverse.
🎬 See why a sudden loss of power might trigger a recall.
• Extremely harsh or slamming gear shifts, especially into first gear.
• Transmission gets stuck in one gear (limp mode) 🎬 Watch: A breakdown of common Cadillac transmission problems and their causes., often 5th gear.
• Delayed engagement when shifting from Park.
• Check Engine Light or Transmission Warning Light is on.
• Engine RPMs shoot up without acceleration (slipping).
• Transmission shuddering during deceleration.

Most Likely Causes

1. Internal Transmission Mechanical Failure (Out-of-Round Snap Rings) 🔴 High Probability → Shop Transmission Assembly Manufacturer TSB #PIP5974E specifically identifies out-of-round 1-2-3-4-5-6 snap rings as a direct cause for code P0747 on this platform and its relatives using the 9TXX transmissions. This is a known pattern failure.
   How to confirm: Diagnosis requires transmission disassembly and inspection of internal components. Dark, burnt, or debris-filled transmission fluid is a strong indicator of this failure. The TSB instructs technicians to inspect the 1-2-3-4-5-6 clutch backing plate retaining ring and the clutch spring retaining ring.
   Typical fix: The transmission must be removed and disassembled to replace the faulty snap rings and any other components damaged by the failure. Often, a complete transmission rebuild or replacement with a unit like GM part #24297433 is the most effective solution.
   Est. part cost: $200-$1500
2. Low or Contaminated Transmission Fluid 🟡 Medium Probability → Shop Transmission Assembly
   How to confirm: Check the transmission fluid level and condition according to the manufacturer's procedure. The fluid should be at the correct level, bright red or translucent brown, and free of excessive metallic debris or a burnt smell.
   Typical fix: Perform a transmission fluid drain and fill using the correct fluid (DEXRON VI). If the fluid is heavily contaminated, it's a sign of the internal mechanical failure mentioned above, and a simple fluid change will not fix the issue.
   Est. part cost: $75-$200
3. Failed Pressure Control Solenoid 'A' or Valve Body ⚪ Low Probability → Shop Transmission Valve Body While the code directly names the solenoid, TSBs and repair experts for this platform suggest it is often a symptom rather than the root cause. However, a solenoid or valve body can still fail independently due to worn bores or stuck valves.
   How to confirm: A professional scan tool can command the solenoid on and off to see if it responds electrically and if the corresponding pressure changes are observed in live data. The valve body may be inspected for worn bores or stuck valves, but this is less likely to be the root cause than the snap rings.
   Typical fix: Replacement of the specific solenoid or the entire transmission control valve body assembly. A genuine GM valve body for the 9TXX series 🎬 Watch: See how this updated GM valve body fixes P0747 issues. is part number 24043134.
   Est. part cost: $250-$800

Rare But Worth Checking

• Body Control Module (BCM) Malfunction: → Shop Body Control Module According to TSB #PIP5697B, this code can be falsely set by the BCM during engine cranking if the BCM fails to supply voltage to the TCM for at least 15 seconds after the ignition is turned off, preventing a proper power-down self-test.
• Wiring Harness Issue: Damage to the wiring between the TCM and the transmission can cause a short or open circuit, leading to solenoid control issues. This could be inside or outside the transmission. The internal transmission wiring harness (OEM #24046896, which supersedes #24298758) is a potential point of failure.
• Transmission Control Module (TCM) Failure: → Shop Transmission Assembly While uncommon, the TCM itself can fail, sending an incorrect signal to the solenoid. This is usually diagnosed after all other possibilities have been eliminated.

Diagnosis Steps

1. Scan the TCM for all stored trouble codes. Note if P0747 is accompanied by P0746 or P0700.
2. Check the transmission fluid level and condition. If the fluid is dark, burnt, or contains metallic debris, suspect a severe internal mechanical failure as described in TSB #PIP5974E and #24-NA-088.
3. If the fluid is clean, investigate the rare BCM electrical issue (TSB #PIP5697B). Check if the code only sets on startup after the ignition has been cycled off. This involves checking for continuous voltage from the BCM to the TCM for at least 15 seconds post-shutdown.
4. Inspect the transmission wiring harness and connectors for any visible damage, corrosion, or loose connections.
5. Using a professional bidirectional scan tool (like GM GDS2), monitor the live data for Pressure Control Solenoid 'A'. Observe the commanded state versus the actual state and the resulting line pressure readings.
6. Perform an active test to command the solenoid on and off. Listen for an audible click from the transmission and watch for the correct pressure response in the live data.
7. If the solenoid does not respond correctly and the wiring is confirmed to be good, the issue may be the solenoid/valve body.
8. If the solenoid and wiring test correctly, or if the fluid was found to be full of debris, the next step is to suspect an internal mechanical failure as described in TSB #PIP5974E. This requires removal and inspection of the transmission.

Parts You'll Likely Need

• Transmission Assembly (OEM #24297433) — Due to the high probability of internal mechanical failure (snap rings), a complete remanufactured or new transmission is often the most reliable and time-effective repair. A GM pilot program for the 9T65 transmission directed dealers to replace, not internally repair, transmissions with internal faults.
  Trusted brands: ACDelco
  OEM price range: $3000-$5000
  Aftermarket price range: $2500-$4000
• Transmission Rebuild Kit (including Snap Rings) — If a shop is performing an in-house rebuild, this kit contains the necessary seals, gaskets, clutches, and updated snap rings to address the TSB-identified failure.
  Trusted brands: ACDelco, Transtar
  OEM price range: $400-$800
  Aftermarket price range: $300-$600
• Transmission Control Valve Body (OEM #24043134) — Replaced if diagnosis confirms a hydraulic leak or stuck valve within the body itself, and no internal mechanical damage is found. It typically includes all solenoids. GM bulletin #24-NA-088 suggests that in many cases of P0747, only the control valve body may need replacement if the fluid is not full of debris.
  Trusted brands: ACDelco
  OEM price range: $500-$900
  Aftermarket price range: $400-$700

Related Codes That Often Appear With This One

• P0746 — P0746 ('Pressure Control Solenoid 'A' Performance/Stuck Off') is the companion code to P0747. Both are cited in the same TSBs (#PIP5974E, #PIE0720A) and relate to the same solenoid and underlying mechanical issues.
• P0700 — P0700 is a generic code indicating that the Transmission Control Module (TCM) has requested the Check Engine Light to be turned on. It will almost always be present alongside a specific transmission code like P0747.

Technical Service Bulletins (TSBs) & Recalls

• PIP5974E: Communicates that out-of-round transmission snap rings can cause codes P0746 or P0747.
• PIE0720A: Seeks information from technicians regarding a 'no move' condition associated with codes P0746 and P0747.
• PIP5697B: Details a rare electrical fault where the BCM can induce a false P0747 code during engine start-up.
• PIE0720: An earlier version of PIE0720A, also for data gathering on the 'no move' condition.

Platform-Specific Known Issues

• TSB #PIP5974E documents that out-of-round 1-2-3-4-5-6 snap rings can cause code P0747. This is a known mechanical weak point in the GM 9TXX family of transmissions.
• TSBs #PIE0720A and #PIE0720 were issued to gather data from the field on vehicles that would not move and had set codes P0746 or P0747, highlighting the severity and frequency of the issue.
• TSB #PIP5697B notes a rare electrical scenario where the BCM can cause a false P0747 code during engine cranking in Park due to a power-down self-test failure.
• A recall was issued in March 2023 for some 2022-2023 XT5 models due to an incorrectly sized sun gear in the 9-speed transmission, which could lead to a loss of propulsion.

Mechanic-Grade Diagnostic Values

• Pressure Control Solenoid (PWM) Resistance — expected: 3-8 Ohms. Failure: A reading outside this range indicates a failed solenoid coil.
• Shift Solenoid (On/Off) Resistance — expected: 20-40 Ohms. Failure: A reading outside this range indicates a failed solenoid coil. While PCS 'A' is a PWM type, this value is useful for checking other solenoids in the valve body.
• Transmission Fluid Temperature for Level Check (Aisin Transmission) — expected: 95°F - 113°F (35°C - 45°C). Failure: Checking the fluid level outside this temperature range will result in an incorrect reading.

Scan Tool Commands That Help

• GM GDS2: Solenoid Valve Diagnosis / Active Test — This is a critical first step to determine if the solenoid is electrically functional. It allows a technician to command Pressure Control Solenoid 'A' on and off to see if it responds, helping to isolate a wiring or solenoid fault from an internal mechanical problem.
• GM GDS2: Transmission Service Fast Learn — This procedure MUST be performed after replacing the valve body, TCM, or the entire transmission assembly. It resets and relearns the adaptive pressure values needed for proper shift quality.
• GM GDS2: Hydraulic System Flush Procedure — Used to cycle fluid through the entire transmission hydraulic circuit, including the cooler. This is essential after a repair that generated debris (like a clutch failure) to ensure contaminants are removed before putting the vehicle back in service.
• GM GDS2: Control Function to Command All Shifts — This diagnostic tip helps differentiate between an internal transmission fault and an external input/command issue. If the transmission successfully shifts through all gears when commanded by the scan tool, the problem is more likely with sensors or wiring providing input to the TCM, rather than the transmission's internal mechanics.

Wiring & Ground Locations

• G401 — Under the trim panel on the right side of the rear compartment, to the rear of the right wheel well.. A GM TechLink article notes that loose or unattached terminals at ground G401 can cause a wide range of seemingly unrelated DTCs and communication issues between modules. While not directly linked to P0747, a poor ground can cause erratic behavior in control modules like the TCM, making it a crucial location to check for any electrical fault diagnosis.

OEM Part Supersession History

• 24298758 → 24046896 — Standard part revision and update by the manufacturer for the internal transmission wiring harness.
  Heads up: Part number 24046896 also replaces previous numbers 24045610 and 24294895. Using the latest part number is critical to ensure compatibility and any design improvements.

Model Year Variations Within This Range

• 2022-2023: A recall was issued for a batch of 9-speed transmissions built with an incorrectly sized sun gear, which could cause the driver-side half-shaft to disengage, resulting in a loss of propulsion or park function. This affects 783 Cadillac XT5s from these model years.