Skip to content
Tahoe / Yukon Service Manual

Transmission Solenoid Information

Table 1: GEN 1 Table 2: GEN 2 Table 3: AUX

Transmission Solenoid Information — figure 1
Transmission Solenoid Information — figure 1

GEN 1

Valve Body Bore Location / Call Out Component Code / Name Function Type Resistance Value @ 20°C (68°F)
6 Q77A Transmission Control Solenoid Valve 1 Clutch Control C1 (1–2–3–4–5–6– R) Linear, Normally Low 5.0 to 5.4 Ω
3 Q77B Transmission Control Solenoid Valve 2 Clutch Control C2 (1–2–8–9–10–R) Linear, Normally Low 5.0 to 5.4 Ω
4 Q77C Transmission Control Solenoid Valve 3 Clutch Control C3 (2–3–4–5–7–9– 10) Linear, Normally Low 5.0 to 5.4 Ω
Valve Body Bore Location / Call Out Component Code / Name Function Type Resistance Value @ 20°C (68°F)
1 Q77D Transmission Control Solenoid Valve 4 Clutch Control C4 (4–5–6–7–8–9– 10–R) Linear, Normally Low 5.0 to 5.4 Ω
2 Q77E Transmission Control Solenoid Valve 5 Clutch Control C5 (1–3–5–6–7–8– 9) Linear, Normally Low 5.0 to 5.4 Ω
5 Q77F Transmission Control Solenoid Valve 6 Clutch Control C6 (1–2–3–4–6–7– 8–10–R) Linear, Normally Low 5.0 to 5.4 Ω
8 Q77G Transmission Control Solenoid Valve 7 Torque Converter Clutch Variable Force, Normally Low 5.0 to 5.4 Ω
7 Q77H Transmission Control Solenoid Valve 8 Line Pressure Variable Force, Normally High 5.0 to 5.4 Ω
Transmission Solenoid Information — figure 2
Transmission Solenoid Information — figure 2

GEN 2

Valve Body Bore Location / Call Out Component Code / Name Function Type Resistance Value @ 20°C (68°F)
A Q77A Transmission Control Solenoid Valve 1 Clutch Control C1 (1–2–3–4–5–6– R) Linear, Normally Low 5.0 to 5.4 Ω
B Q77B Transmission Control Solenoid Valve 2 Clutch Control C2 (1–2–8–9–10–R) Linear, Normally Low 5.0 to 5.4 Ω
C Q77C Transmission Control Solenoid Valve 3 Clutch Control C3 (2–3–4–5–7–9– 10) Linear, Normally Low 5.0 to 5.4 Ω
D Q77D Transmission Control Solenoid Valve 4 Clutch Control C6 (1–2–3–4–6–7– 8–10–R) Linear, Normally Low 5.0 to 5.4 Ω
E Q77E Transmission Control Solenoid Valve 5 Clutch Control C5 (1–3–5–6–7–8– 9) Linear, Normally Low 5.0 to 5.4 Ω
F Q77F Transmission Control Solenoid Valve 6 Clutch Control C4 (4–5–6–7–8–9– 10–R) Linear, Normally Low 5.0 to 5.4 Ω
T Q77H Transmission Control Solenoid Valve 8 Torque Converter Clutch Variable Force, Normally Low 5.0 to 5.4 Ω
AB Q77G Transmission Control Solenoid Valve 7 Line Pressure Variable Force, Normally High 5.0 to 5.4 Ω
1 M123 Transmission Park Valve Lock Solenoid Actuator — — 15 to 25 Ω
Valve Body Bore Location / Call Out Component Code / Name Function Type Resistance Value @ 20°C (68°F)
2 B316 Transmission Park Valve Position Switch Transmission Park Valve Position Sensor 1 0.78 to 0.82 V 1.98 to 2.02 V
Transmission Park Valve Position Sensor 2 0.78 to 0.82 V 1.98 to 2.02 V
Transmission Solenoid Information — figure 3
Transmission Solenoid Information — figure 3

AUX

Call Out Number Component Code TCM Scan Tool Parameter Type Resistance Value @ 20°C (68°F)
1 Q77J Transmission Control Solenoid Valve 9 Default Disable * Solenoid is needed to achieve 2nd, 7th and Reverse when a fault is present. ON/OFF 18 to 22 Ω
2 B315A Transmission Range Control Transmission Range Control Valve 1 Position Switch Status — —
© 2023 G eneral Motors. All r ights reserved.
Call Out Number Component Code TCM Scan Tool Parameter Type Resistance Value @ 20°C (68°F)
Valve 1 Position Switch