P2812 on 2019-2021 Chevrolet Silverado 1500: Transmission Solenoid and Valve Body Guide
P2812 on a 2019-2021 Silverado 1500 almost always points to a problem within the 10-speed (10L80) transmission's valve body. A specific GM Technical Service Bulletin (TSB #PIP5799) advises replacing the entire valve body assembly to fix this code, which indicates an open circuit for the line pressure control solenoid. Expect a repair cost of over $2,000 at a dealership, with some owners reporting quotes as high as $3,600.
Most Likely Cause
Failed Transmission Valve Body Assembly
Difficulty
5/5
Est. Time
4 hrs
DIY Doable?
🔧 Shop
Shop Labor
$1200 – $3600
Parts Price
$700 – $1400
Drivable, but...
— You can drive, but continued operation with erratic shifts and incorrect line pressure can cause accelerated wear on clutches and other internal transmission components, potentially leading to a much more expensive failure. Some owners have reported sudden, violent shifting events that could pose a safety risk. It is strongly recommended to have the vehicle serviced promptly.
Key Takeaways
- P2812 on a 2019-2021 Silverado is a serious transmission code, almost always pointing to a known internal electrical fault with the 10L80 transmission's valve body.
- A General Motors TSB (#PIP5799) specifically recommends replacing the entire valve body assembly with an updated part (OEM #24071206) to fix this code.
- Do not be surprised by a high repair quote; this is not a cheap or simple fix. Expect costs to exceed $2,000, with some dealer quotes reaching $3,600.
- This is not a DIY-friendly repair. It requires specialized tools, knowledge of transmissions, and electronic programming (service learn procedure) after installation.
- Driving with this code can lead to further, more severe transmission damage and potentially unsafe, sudden shifting behavior. It should be addressed promptly.
The trouble code P2812 stands for "Pressure Control Solenoid 'G' Control Circuit/Open". In your Silverado's 10-speed automatic transmission, solenoids are small, computer-controlled valves that manage the flow of hydraulic fluid. This fluid pressure is what allows the transmission to shift gears. Code P2812 means the Transmission Control Module (TCM) has detected an open circuit or a malfunction with the specific solenoid designated as 'G', which is responsible for regulating line pressure. This prevents the transmission from properly controlling hydraulic pressure, leading to harsh shifting and other performance issues.
What's Unique About the 2019-2021 Chevrolet SILVERADO 1500
The 2019-2021 Silverado 1500 uses a sophisticated 10-speed automatic transmission (RPO code MQB for the 10L80). While generally robust, this transmission has a known issue documented by General Motors. TSB #PIP5799 directly addresses codes P2812 and P2814, pointing to an internal electrical fault in the valve body as the root cause, rather than just a single bad solenoid or external wiring issue. The solenoids and control module are integrated into the valve body assembly (sometimes called a TEHCM), making individual component replacement difficult or impossible. This makes complete valve body replacement the common, manufacturer-recommended repair for this specific code on this truck.
Diagnostic Flowchart
Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.
Have you inspected the transmission control module connector and wiring harness?
→ Visually inspect the TCM connector to ensure it is fully latched (TSB 19-NA-228) and check the wiring harness for chafing (TSB 21-NA-149).
→ Reseat the TCM connector ($0) or repair the damaged wiring section ($5-$50), then clear the P2812 code.
🎬 Watch: How to fix the P2812 pressure control solenoid circuit.Have you checked the transmission fluid level and condition?
🎬 Watch: Step-by-step 10L80 transmission fluid and filter change guide.→ Burnt fluid indicates internal mechanical damage beyond just the valve body. Tow to a shop for a full transmission inspection.
→ The valve body has likely failed internally (TSB PIP5799). Have a shop replace it with updated OEM part 24071206 🎬 See the differences in the updated Gen-3 valve body design. ($900-$1400 part, $1200-$3600 labor).
Professional service recommended: Replacing a transmission valve body is a complex job that involves working inside the transmission, requires specialized knowledge, and may require programming with a GM-specific scan tool. The vehicle will need to undergo a transmission adaptive pressure learning procedure after the repair.
Symptoms You May Notice
- Check Engine Light is on.
- Harsh or jerky shifting, sometimes described as a "bang" or "lurch," especially during downshifts or the 1-2 shift.
- Delayed gear engagement from Park to Drive or Reverse.
- Transmission slipping (engine RPMs rise without an increase in speed).
- Vehicle may enter "limp mode," limiting available gears to protect the transmission.
- Increased fuel consumption.
- Rough or coasting downshifts.
⚠️ Don't Waste Money on the Wrong Fix
- Replacing only a single pressure control solenoid. While the code points to a specific solenoid circuit, the root cause on this platform is often an internal fault within the entire valve body assembly, as per TSB #PIP5799. The solenoids are generally not serviced separately.
- Replacing the Transmission Control Module (TCM). While a faulty TCM driver circuit can cause this code in theory, the TCM is integrated with the valve body on the 10L80. The entire assembly is replaced as one unit.
Most Likely Causes
- Failed Transmission Valve Body Assembly 🔴 High Probability → Shop Transmission Valve Body As documented in GM TSB #PIP5799, there is a known issue with an internal electrical fault in the valve body on 10-speed transmissions that specifically causes codes P2812 and P2814. Forum discussions and mechanic reports confirm this is the most common failure, often due to an internal circuit board or solenoid failure within the sealed assembly.
How to confirm: After ruling out external wiring issues, a technician will follow GM's diagnostic procedure. If the procedure does not identify another cause, TSB #PIP5799 directs the replacement of the valve body.
Typical fix: Replace the entire transmission control valve body assembly. This part is the hydraulic and electronic control center of the transmission. GM has released updated versions of this part to address reliability issues.
Est. part cost: $700-$1400 - Poor Connection at the Transmission Control Module (TCM) ⚪ Low Probability → Shop Transmission Assembly GM TSB #19-NA-228 and the PIT5677 series note that a wide variety of codes, including P2812, can be set by a TCM connector that is not fully seated, causing poor terminal connections. While not specific to P2812, it's a known issue on these trucks and a simple check to perform.
How to confirm: Visually inspect the main connector at the TCM. Check if it is crooked, loose, or not fully latched. A technician may reseat the connector.
Typical fix: Ensure the TCM connector is properly seated and latched. No parts are typically required for this repair.
Est. part cost: $0 - Wiring Harness Issue ⚪ Low Probability Wiring is exposed to heat and vibration, which can cause chafing, corrosion, or breaks over time.
How to confirm: Visually inspect the wiring harness leading to the transmission for any damage. A multimeter would be used to check for continuity between the TCM and the transmission connector to identify an open circuit.
Typical fix: Repair the damaged section of the wiring harness.
Est. part cost: $5-$50
Rare But Worth Checking
- Low or Contaminated Transmission Fluid: → Shop Transmission Assembly
Diagnosis Steps
- Verify the code with a professional OBD-II scanner capable of reading transmission-specific data.
- Check for any Technical Service Bulletins (TSBs) related to the code and vehicle. For P2812, TSB #PIP5799 is highly relevant.
- Inspect the transmission fluid level and condition. Burnt or dark fluid can indicate a larger mechanical issue.
- Inspect the wiring harness and connectors between the main vehicle harness and the transmission for any visible damage, corrosion, or loose connections.
- Check the main transmission harness connector to ensure it is fully seated and latched, as per related TSBs like #19-NA-228.
- If all external checks pass, follow the diagnostic procedure in the factory service manual. This will likely involve testing the circuit's integrity with a multimeter.
- If diagnostics do not find an external root cause (wiring, connectors), replace the transmission valve body as recommended by TSB #PIP5799.
- After replacement, the TCM must be programmed and a transmission service fast learn (adaptive learn) procedure must be performed.
Parts You'll Likely Need
- Automatic Transmission Control Valve Body
(OEM #24071206)— This is the specific fix recommended by GM in TSB #PIP5799 for code P2812 on this vehicle. This part number represents a redesigned 'Gen 3' valve body intended to be more reliable than the original. It supersedes older part numbers like 24065353 and 24047995.
Trusted brands: ACDelco, GM Genuine Parts
OEM price range: $900-$1400
Aftermarket price range: Not generally available or recommended.
Related Codes That Often Appear With This One
- P2814 — This code, for Pressure Control Solenoid 'G' Stuck Off, is also explicitly mentioned in TSB #PIP5799 alongside P2812 as being caused by the same internal valve body electrical fault.
- P0700 — This 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 more specific transmission codes like P2812.
Technical Service Bulletins (TSBs) & Recalls
- PIP5799: Directly links P2812 and P2814 to an electrical fault in the Transmission Control Solenoid Valve 7 (Line Pressure Solenoid) within the valve body and recommends its replacement on a wide range of 2019-2021 GM vehicles with 10-speed transmissions.
- PIT5677E / PIT5677C / PIT5677B: Lists P2812 among many other DTCs that could be caused by a poor connection at the TCM.
- 19-NA-228: Describes how a poorly seated TCM connector can cause a multitude of electrical DTCs and provides instructions for proper inspection and seating.
- Special Coverage N242454441: While not a TSB, GM extended warranty coverage to 15 years/150,000 miles for some 2020-2022 trucks for a related valve body issue causing momentary rear wheel lock-up, further confirming known defects in this assembly.
Platform-Specific Known Issues
- TSB #PIP5799 was issued specifically for 2019-2021 models with 10-speed transmissions, instructing technicians to replace the valve body to correct codes P2812 or P2814 if other diagnostics don't find a cause.
- A related issue involving a sticking 'Feed Limit Low Valve' within the valve body prompted a safety recall (NHTSA #N242459230) on some GM trucks for risk of rear-wheel lockup, highlighting the component's history of problems.
- Due to high failure rates, the replacement valve body (Part No. 24071206) has experienced significant backorders, with some owners waiting months for the part.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
Year Coverage
This article covers the OBD-II Code P2812 for:
- Chevrolet SILVERADO 1500:
In This Article
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- 🧭 Diagnostic Flowchart
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- What's Unique About the 2019-2021 Chevrolet SILVERADO 1500
- Symptoms You May Notice
- Most Likely Causes
- Rare But Worth Checking
- Diagnosis Steps
- Parts You'll Likely Need
- Related Codes That Often Appear With This One
- Technical Service Bulletins (TSBs) & Recalls
- Platform-Specific Known Issues
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