Circuit/System Testing

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban 3500 HD, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

Verify the transmission line pressures are within the specified ranges. Refer to Line Pressure Check .
- If pressures are not within range
  Refer to Fluid Pressure High or Low .
- Go to next step: If pressures are within range
Ignition OFF. Remove the Q8 Control Solenoid Valve Assembly.
Verify a pressure change occurs for all solenoids when performing the solenoid test. Refer to Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
- If a pressure change does not occur
  Replace the Q8 Control Solenoid Valve Assembly.
- Go to next step: If a pressure change does occur
Verify the conditions listed below do not exist. Carefully inspect each component for that condition. Repair or replace as necessary.

P2714 or P2715 - Control Valve Upper Body Assembly (304)

2-6 clutch regulator valve (334) stuck/sticky - debris, binding, damaged valve, or scored bore.

P2714 - Q8 Control Solenoid Valve Assembly (314)

Refer to document PIP 4304A. DTC P2714 may be set with DTC P0878.

P2714 or P2715 - Q8 Control Solenoid Valve Assembly (314)

Control signal fluid supply leak-valve body filer plate assembly cracked or damage gasket seal.
O-ring seals leaking.

P2714 or P2715 - Center (w/2-6 and Low/Rev Clutch) Support Assembly (67)

2-6 clutch return spring retaining ring (455) not seated in groove.
2-6 clutch piston assembly - seal damaged or leaking.
2-6 clutch plates (451 - 453) worn or damaged.
Center support transfer seal assembly (20) incorrectly installed.

P2714 - 1-2-3-4 and 3-5-R Clutch Housing Assembly (51)

1-2-3-4 clutch backing plate retaining ring (429) not seated/oriented correctly.
1-2-3-4 clutch piston (414) - seals damaged or leaking.
1-2-3-4 clutch piston (414) - cracked or damaged.

P2714 - 4-5-6 (w/turbine shaft) Clutch Assembly (56)

Turbine shaft fluid seal rings (442) damaged or leaking.
4-5-6 clutch piston assembly (439) - seals damaged or leaking.

P2714 - A/Trans Fluid Pump Cover Assembly (219)

Pump tower seals (230) damaged or leaking.

P2714 - Torque Converter (w/fluid pump) Housing Assembly (2)

Fluid pump housing/vanes/rotor/slide damaged/scored.

P2714 - A/Trans Fluid Filter Assembly (26)

Oil filter (26) or filter seal (25) loose or damaged.