P0751 on 2010-2014 Chevrolet Express: Causes and Fixes for Shift Solenoid 'A' Stuck Off

What's Unique About the 2010-2014 Chevrolet EXPRESS

For this generation of Chevrolet Express vans, which are typically equipped with a 6L80 or heavier-duty 6L90 transmission, GM has issued specific Technical Service Bulletins (TSBs) about P0751. These bulletins directly point to the Clutch Select Solenoid Valve 2 sticking in its bore within the valve body, often due to scratches on the valve itself. This makes the diagnosis much more straightforward compared to other vehicles where P0751 might have a wider range of equally likely causes.

Diagnostic Flowchart

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

Symptoms You May Notice

• Reduced acceleration at low speed, especially from a stop.
• Transmission slipping when launching from a stop.
• Vehicle feels like it is starting in a higher gear (e.g., 3rd or 4th).
• Harsh or abrupt shifting.
• Check Engine Light is illuminated.
• Cruise control may be disabled.

Most Likely Causes

1. Sticking Shift Solenoid 'A' (Clutch Select Solenoid Valve 2) 🔴 High Probability → Shop Transmission Valve Body This is a well-documented issue for GM 6-speed transmissions of this era, as confirmed by manufacturer TSBs PI1344B and PI1344C. The valve can develop scratches or get stuck in its bore within the valve body due to debris or a design issue with the original valve springs.
   How to confirm: A technician can use a bidirectional scan tool to command 'PC Solenoid 2' on and off while monitoring transmission data. The most definitive test is to remove the valve body and physically inspect the Clutch Select Solenoid Valve 2 for scoring or sticking in its bore. A resistance test on the solenoid should yield a reading between 20-40 ohms.
   Typical fix: Replace the faulty solenoid. 🎬 See this walkthrough on diagnosing and solving 6L80 solenoid problems. If the valve body bore is scratched or damaged, the lower valve body assembly must be replaced as per GM's recommendation. Some aftermarket companies like Sonnax offer upgraded spring kits as a preventative measure.
   Est. part cost: $40-$120 for a single solenoid, $200-$450 for a valve body assembly.
2. Low or Dirty Transmission Fluid 🟡 Medium Probability → Shop Transmission Assembly Fluid breakdown can cause sludge and debris to form, which then clogs the fine passages within the valve body and solenoids, causing them to stick. Additionally, a failing torque converter can shed clutch material, contaminating the fluid and quickly destroying a new valve body assembly.
   How to confirm: Check the transmission fluid level and condition. The correct fluid is DEXRON-VI. The fluid should be at the correct level (checked at a specific temperature, as there is no dipstick), have a reddish color, and not smell burnt.
   Typical fix: Perform a transmission fluid and filter change. If the fluid is very dark or contains significant metal debris, it indicates a more severe internal problem that must be addressed before or during solenoid/valve body replacement.
   Est. part cost: $70-$150 for a fluid and filter kit.
3. Faulty Wiring or Connectors ⚪ Low Probability
   How to confirm: Inspect the main transmission connector on the passenger side of the transmission case for corrosion, damage, or loose pins. Also, inspect the internal wiring harness after removing the transmission pan for brittleness or damage.
   Typical fix: Repair or replace the damaged section of the wiring harness or the connector. Applying dielectric grease during reassembly can prevent future moisture intrusion.
   Est. part cost: $20-$200 depending on the extent of the damage.

Rare But Worth Checking

• Faulty Transmission Control Module (TCM): → Shop Transmission Assembly The TCM is integrated into the valve body assembly (called a TEHCM) on these transmissions. It is rarely the cause of an isolated P0751 code and should only be considered after solenoids and wiring have been ruled out.
• Failed Valve Body Spacer Plate Gasket: → Shop Transmission Valve Body Remanufacturing specialists like Jasper Engines & Transmissions have identified that a lack of oil supply to the solenoid can cause a delay in its operation, triggering P0751. Their solution is to install an updated, notched valve body spacer plate gasket 🎬 Watch: Jasper Engines explains the updated spacer plate gasket fix. to improve oil flow.

Diagnosis Steps

1. Verify the transmission fluid level and condition. Ensure it is filled with DEXRON-VI fluid.
2. Use a professional OBD-II scanner to confirm P0751 is the active code and check for any other stored transmission codes.
3. Using a bidirectional scanner, perform a solenoid performance test. TSB PI1344C specifies that 'PC Solenoid 2' is the one that can cause this condition.
4. If the test is inconclusive, drop the transmission oil pan and visually inspect the fluid and pan magnet for excessive metal debris. A small amount of fine, gray material is normal, but large flakes are a sign of hard part failure.
5. Inspect the internal transmission wiring harness and connectors for any signs of damage or corrosion.
6. Remove the lower valve body and inspect the Clutch Select Solenoid Valve 2. Check if it moves freely in its bore and look for any scratches or scoring on the valve itself. Note that loosening the valve body bolts may free a stuck valve, so inspection for scratches is critical.
7. If the valve is stuck or scored, replace the lower valve body assembly as recommended by GM. If it appears undamaged, an aftermarket solution like the Sonnax spring kit (104740-02K) could be considered.

Parts You'll Likely Need

• Lower Valve Body Assembly (OEM #24253557) — This is the official GM-recommended repair if the bore for the solenoid valve is scratched or damaged, as it ensures the new solenoid can operate smoothly.
  Trusted brands: ACDelco
  OEM price range: $250-$450
  Aftermarket price range: $180-$350
• Clutch Select Valve Spring Kit (OEM #104740-02K) — If the valve body bore is undamaged, this aftermarket kit from Sonnax provides updated springs with a lower load to prevent the valve from sticking, which can resolve the P0751 code without replacing the entire valve body.
  Trusted brands: Sonnax
  OEM price range: N/A
  Aftermarket price range: $10-$20
• Transmission Filter and Pan Gasket Kit — This is required for any repair that involves removing the transmission pan.
  Trusted brands: ACDelco
  OEM price range: $40-$60
  Aftermarket price range: $20-$40
• DEXRON-VI Automatic Transmission Fluid (OEM #10-9243) — This is the required fluid type for the 6L80/6L90 transmission. A typical pan drop service requires 6-8 quarts.
  Trusted brands: ACDelco, Valvoline, Castrol
  OEM price range: $10-$15 per quart
  Aftermarket price range: $8-$12 per quart

Technical Service Bulletins (TSBs) & Recalls

• PI1344C: Diagnostic tips for reduced acceleration and slipping with P0751. Specifies testing 'PC Solenoid 2' and replacing the lower valve body if scratches are found on the valve.
• PI1344B: Identifies sticking Clutch Select Solenoid Valve 2 as a potential cause for P0751 and a resulting 4th gear start.
• PIP4379M: A general TSB that lists P0751 as a possible result of low or contaminated fluid causing issues with the transmission pump.

Platform-Specific Known Issues

• GM issued Technical Service Bulletin PI1344C for 2010-2019 models, including the Chevrolet Express, to address customer concerns of 'reduced acceleration at low speed and/or transmission slipping from a launch' associated with DTC P0751.
• An earlier version of the bulletin, PI1344B, explicitly states the condition may be caused by the 'Clutch Select Solenoid Valve 2 (359), located in the lower valve body, sticking in its bore resulting in a 4th gear start'.

Mechanic-Grade Diagnostic Values

• Shift Solenoid (On/Off type) resistance — expected: 20 - 40 Ohms. Failure: A reading outside this range (e.g., open circuit or short) indicates a failed solenoid coil.
• Pressure Control (PC) Solenoid (PWM type) resistance — expected: 3 - 8 Ohms. Failure: A reading outside this range indicates a failed solenoid coil. Note: The solenoid related to P0751, Clutch Select Solenoid 2, is a PWM solenoid.
• Shift Solenoid (On/Off type) current draw — expected: 0.3 - 0.7 Amps at 12V. Failure: Incorrect amperage draw when the solenoid is manually energized points to an electrical failure within the solenoid.
• Pressure Control (PC) Solenoid (PWM type) current draw — expected: 1.5 - 4.0 Amps at 12V. Failure: Incorrect amperage draw when the solenoid is manually energized points to an electrical failure within the solenoid.

Scan Tool Commands That Help

• GM GDS2/Tech2: Transmission Output Controls / Solenoid Performance Test — Used to manually command a specific solenoid (like Shift Solenoid 1/Clutch Select Valve 2) on and off to verify its electrical operation and check for mechanical response (e.g., an audible click or pressure change).
• GM GDS2/Tech2: Solenoid Cleaning Procedure — This automated function cycles all solenoids with the vehicle in Park to flush debris from the solenoids and their hydraulic circuits. It can be used as a first step if minor contamination is suspected.
• GM GDS2/Tech2: Transmission Service Fast Learn — This procedure is required after replacing the TEHCM (valve body/TCM assembly) to allow the new module to learn the clutch volume characteristics. It is not needed if installing a new GM-sourced unit, as they are pre-learned.

Wiring & Ground Locations

• G102 / G103 — On the left (G102) and right (G103) rear of the engine block for V8 models (excluding 6.6L). These are primary grounds for the engine control systems.. A poor ground connection at these points can cause erratic behavior and incorrect readings for the Engine Control Module (ECM) and integrated Transmission Control Module (TCM), potentially triggering false solenoid performance codes.
• G104 — On the lower right front of the engine.. This is another critical engine ground. Ensuring all engine-to-chassis grounds are clean and tight is a key step in ruling out electrical issues before condemning internal transmission components.

OEM Part Supersession History

• 24246916 → 24245720 — The original (1st design) separator plate was updated to a 2nd design to improve fluid flow and pressure characteristics, helping to prevent issues like P0751.
  Heads up: On pre-mid-2010 vehicles, if installing the Sonnax spring kit 104740-02K, the 1st design plate MUST be replaced with the 2nd design plate for the repair to be effective.

Model Year Variations Within This Range

• 2010 (early production): Early 2010 and prior models were equipped with higher-tension springs on the clutch select valves. This higher spring force could inhibit valve movement and was a direct cause of P0751. Later models used updated springs with a lower load, making them less prone to this specific failure mode.