P0747 Pressure control solenoid A stuck on

Pressure control solenoid A stuck on

P0747 in short

P0747 means the transmission computer sees pressure control solenoid A acting as if stuck on, so line pressure is not following its commands. On many 2019–2024 GM vehicles a worn control valve is to blame and GM offers extended coverage. Have it inspected soon and check your VIN.

Pressure control solenoid A sets the main hydraulic pressure that applies the clutches. The computer commands it and checks that pressure follows. P0747 sets when the pressure behaves as if the solenoid were stuck on, so the computer cannot lower it as commanded.

Most reports come from GM 8- and 10-speed trucks, SUVs and cars. GM says the transmission control valve can wear and slowly lose pressure, causing harsh shifting, a service engine soon message, reduced engine performance or P0747. It has special coverage of 15 years or 150,000 miles on many 2019–2022 models and a valve body bulletin for 2023–2024.

On GM crossovers, P0747 has also been traced to a clutch spring retaining ring not fully seated on some 2020–2021 models, and to a body computer or circuit fault when it sets at shutdown. A dealer VIN check is the first step.

Most likely causes

  1. Worn transmission control valve losing pressure (2019–2024 GM)

    Supported by vehicle data
    Why it ranks here
    GM special coverages and a service bulletin tie P0747 on many trucks, SUVs and cars to a worn control valve that gradually loses pressure.
    What would change this
    Rises on a covered GM vehicle with harsh shifting or reduced power.

  2. Clutch spring retaining ring not fully seated (2020–2021 Equinox, Terrain, Blazer)

    Supported by vehicle data
    Why it ranks here
    GM says this build fault can set P0747 at low mileage and replaces the transmission if the inspection fails.
    What would change this
    Rises on a low-mileage covered crossover.

  3. Body computer or circuit 5985 fault when the code sets at shutdown (2017–2019 GM)

    Supported by vehicle data
    Why it ranks here
    GM points to the body control module or circuit 5985 when P0747 sets at engine shutdown in park or neutral with no transmission symptoms.
    What would change this
    Rises if the code only sets at shutdown and the transmission drives normally.

  4. Sticking solenoid or valve, or contaminated fluid

    Possible — needs testing
    Why it ranks here
    A stuck-on pressure fault means the valve does not release as commanded, which a sticking valve or debris can cause.
    What would change this
    Rises if the fluid is dark or contaminated.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read codes from the engine and transmission modules with a scan tool that supports both, before anything is cleared.

    Low riskTool: scan tool that reads the transmission module

  2. Ask a GM dealer, or check NHTSA, for special coverage or P0747 bulletins on your VIN.

    Low risk

  3. Have a transmission shop check fluid condition and compare commanded and actual line pressure.

    Best left to a shopTool: scan tool with transmission data

    Warning:Shop test. Many transmissions have no dipstick and need the maker's fluid check procedure.

Symptoms

  • Check engine light or service engine soon message
  • Harsh shifting
  • Reduced engine performance Gets more serious: stop and have it checked.
  • Transmission not shifting or stuck in default mode Gets more serious: stop and have it checked.

Compare with: Check engine light with loss of power

How to fix

  1. Do not clear the code before the transmission module has been read.

  2. Ask a GM dealer whether your VIN is covered by a P0747 special coverage. GM covers the repair for 15 years or 150,000 miles on many models.

Parts and cost context

  • Transmission control module (TCM):On most GM vehicles the fix is the control valve body, not the computer. Check special coverage before paying for a repair.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Chevrolet

  • 2020–2024 · Silverado 1500

    Supported by vehicle data

    GM special coverage N242454441 covers a worn control valve that loses pressure, with harsh shifting, reduced performance or P0747, on 2020–2022 trucks for 15 years or 150,000 miles. Bulletin 24-NA-088 covers control valve body replacement on 2023–2024 trucks. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Transmission control valve body

  • 2020–2022 · Tahoe

    Supported by vehicle data

    GM special coverages N242454441 and N252536751 cover the control valve condition with P0747; the 2022 coverage updates the spacer plate, actuator feed valve and spring. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • 2020–2021 · Equinox

    Supported by vehicle data

    GM service update N202321840 inspects for a clutch spring retaining ring not fully seated, which can set P0747 at low mileage. The Blazer and GMC Terrain are also covered. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • N242454441Status unverified

    Special coverage: transmission control valve wear, P0747

    2020–2022silverado-1500, silverado-2500, silverado-3500, tahoe, suburban · issued · NHTSA 11010810

    A worn control valve can gradually lose pressure, causing harsh shifting, a service engine soon message, reduced engine performance or P0747. Coverage runs 15 years or 150,000 miles. GMC Sierra and Yukon and Cadillac Escalade are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • N242480631Status unverified

    Special coverage: transmission control valve wear, P0747

    2019–2022camaro · issued · NHTSA 11015336

    Same control valve condition, for vehicles that return with P0747 after transmission computer update N242480630. Cadillac CT4, CT5 and CT6 are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • N252536751Status unverified

    Special coverage: transmission control valve wear, P0747

    2022tahoe, suburban · issued · NHTSA 11031380

    Dealers update the valve body spacer plate, actuator feed valve and spring. GMC Yukon and Cadillac Escalade are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 24-NA-088Status unverified

    Control valve body replacement: MIL, not shifting or default mode with P0747

    2023–2024silverado-1500, silverado-2500, silverado-3500 · issued · NHTSA 11001761

    Diagnostic information on possible control valve body replacement. GMC Sierra, Cadillac Escalade, CT4 and CT5 are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • N202321840Status unverified

    Service update: clutch spring retaining ring not fully seated, P0747

    2020–2021equinox, blazer · issued · NHTSA 10187228

    Usually shows at low mileage. Dealers inspect the transmission and replace it if it fails. GMC Terrain is also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • PIP5697EStatus unverified

    P0747 at shutdown in park or neutral: body computer or circuit 5985

    2017–2019equinox, malibu, traverse, cruze, blazer · issued · NHTSA 10178374

    Applies when P0747 sets at engine shutdown in park or neutral with no hydraulic or mechanical transmission concern. Buick, GMC and Cadillac models are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

GMC

  • 2020–2024 · Sierra 1500

    Supported by vehicle data

    Covered by the same GM special coverage and valve body bulletin as the Silverado. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Transmission control valve body

  • N242454441Status unverified

    Special coverage: transmission control valve wear, P0747

    2020–2022silverado-1500, silverado-2500, silverado-3500, tahoe, suburban · issued · NHTSA 11010810

    A worn control valve can gradually lose pressure, causing harsh shifting, a service engine soon message, reduced engine performance or P0747. Coverage runs 15 years or 150,000 miles. GMC Sierra and Yukon and Cadillac Escalade are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 24-NA-088Status unverified

    Control valve body replacement: MIL, not shifting or default mode with P0747

    2023–2024silverado-1500, silverado-2500, silverado-3500 · issued · NHTSA 11001761

    Diagnostic information on possible control valve body replacement. GMC Sierra, Cadillac Escalade, CT4 and CT5 are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Cadillac

  • 2020–2022 · CT5

    Supported by vehicle data

    GM special coverage N242480631 covers the control valve condition with P0747 on vehicles that return after a transmission computer update. The CT4, CT6 and Chevrolet Camaro are also covered. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • N242480631Status unverified

    Special coverage: transmission control valve wear, P0747

    2019–2022camaro · issued · NHTSA 11015336

    Same control valve condition, for vehicles that return with P0747 after transmission computer update N242480630. Cadillac CT4, CT5 and CT6 are also listed. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • P0700Transmission module requests the check engine light

    Primary / secondary Possible — needs testing

    Likely primary: P0747. On cars with a separate transmission module, a basic code reader may show only P0700, which means the module has stored its own code. P0747 can be that code, so fix P0747 and P0700 goes with it.

  • P0746Pressure control solenoid A is not working or stuck off

    Same system Possible — needs testing

    P0746 is the stuck-off or performance fault on the same pressure control solenoid A.

  • P0776Pressure control solenoid B not working as expected or stuck off

    Same system Possible — needs testing

    P0776 is a stuck-off fault on pressure control solenoid B.

All Transmission codes

P0747 questions

Will GM pay for a P0747 repair?

Possibly. GM has special coverage of 15 years or 150,000 miles for a worn control valve on many 2019–2022 trucks, SUVs and cars. A dealer can check your VIN.

Is it safe to drive with P0747?

Have it inspected soon. GM pairs the code with harsh shifts, reduced engine performance and a transmission stuck in default mode.

Sources and review

  1. Toyota Camry Owner's Manual (OM06291U) — Toyota
  2. GM special coverage N242454441: transmission control valve wear, P0747 — General Motors / NHTSA ,
  3. GM 24-NA-088: control valve body replacement for MIL, not shifting or default mode with P0747 — General Motors / NHTSA ,
  4. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  5. GM special coverage N242480631: transmission control valve wear, P0747 (Camaro, CT4, CT5, CT6) — General Motors / NHTSA ,
  6. GM special coverage N252536751: 2022 full-size SUVs, control valve wear, P0747 — General Motors / NHTSA ,
  7. GM service update N202321840: clutch spring retaining ring not fully seated, P0747 — General Motors / NHTSA ,
  8. GM PIP5697E: P0747 at shutdown in park or neutral, BCM or circuit 5985 — General Motors / NHTSA ,
  9. On-Board Diagnostic Trouble Codes (generic code title list) — Delaware Division of Motor Vehicles
  10. DTC P0700 — Saab 9-5 (9650) 2010 Workshop Information System — SaabWISOnline (community rehost of Saab/GM service information)
  11. P0776 Code: Definition and Details — Kelley Blue Book
Last reviewed
Written by
Saurabh K.
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