Front of Engine Components (LHU)

Items
1: G13 Generator G13 Generator (LHU/LEA)
2: B68A Knock Sensor 1 (LHU) B68A Knock Sensor 1
3: Q40 Turbocharger Bypass Solenoid Valve (LHU) Q40 Turbocharger Bypass Solenoid Valve
4: Q12 Evaporative Emission Purge Solenoid Valve Q12 Evaporative Emission Purge Solenoid Valve
5: B74 Manifold Absolute Pressure Sensor B74 Manifold Absolute Pressure Sensor (LHU)
6: Q38 Throttle Body Q38 Throttle Body
7: G18 High Pressure Fuel Pump G18 High Pressure Fuel Pump (LHU/LEA)
8: B47B Fuel Rail Pressure Sensor B47B Fuel Rail Pressure Sensor (LHU)
9: Q17A Fuel Injector 1 Q17A Fuel Injector 1 (LHU)
10: Q17B Fuel Injector 2 Q17B Fuel Injector 2 (LHU)
11: Q17C Fuel Injector 3 Q17C Fuel Injector 3 (LHU)
12: Q17D Fuel Injector 4 Q17D Fuel Injector 4 (LHU)
13: B68B Knock Sensor 2 (LHU) B68B Knock Sensor 2
14: B37 Engine Oil Pressure Switch B37 Engine Oil Pressure Switch
15: B26 Crankshaft Position Sensor B26 Crankshaft Position Sensor
16: M64 Starter Motor M64 Starter Motor
17: B35 Engine Oil Level Switch (LHU) B35 Engine Oil Level Switch
18: B111B Turbocharger Boost/Intake Air Temperature Sensor (LHU) B111B Turbocharger Boost/Intake Air Temperature Sensor
19: Q46 A/C Compressor Solenoid Valve (C67 or CJ2) Q46 A/C Compressor Solenoid Valve (LHU/LEA)

Fig 1: Front of Engine Components (LHU)

Courtesy of GENERAL MOTORS COMPANY

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Front of Engine Components (LHU)