1465ZS0044 - Bosch Fuel Control Actuator

Bosch Fuel Control Actuator (FCA) / MPROP for CP3 Injection Pump – 2001–2004.5 GM 6.6L Duramax LB7 – Part # 1465ZS0044

Experiencing hard starts or no starts on your 2001–2004.5 GM 6.6L Duramax LB7? One of the most common culprits is a failing Fuel Control Actuator (FCA)—also known as the MPROP. This critical component regulates how much fuel your CP3 injection pump delivers, directly affecting rail pressure and engine performance.

The Bosch 1465ZS0044 FCA is a genuine OEM replacement that restores precise fuel metering to your Duramax’s high-pressure fuel system. Built with Bosch’s renowned OE quality, this actuator ensures consistent rail pressure, improved startup reliability, and optimal fueling under load.

Common Symptoms of FCA Failure:

• Hard start or extended crank time

• No-start condition

• Loss of power or poor throttle response

• Diagnostic trouble codes related to rail pressure

In many cases, FCA failure happens gradually. The spring-based design can wear out over time, slowly reducing fuel delivery long before complete failure occurs.

Quick Diagnostic Tip:

Unplug the FCA and attempt to start your engine. If the truck starts (then shuts down shortly after), it's a strong indicator that your FCA is not metering fuel correctly. This test bypasses FCA control and sends full pressure to the rail—do not leave the engine running in this condition, but it’s a useful troubleshooting step.

Product Features:

✅ Genuine Bosch OEM Fuel Control Actuator (MPN: 1465ZS0044)

✅ Direct fit for Bosch CP3 Injection Pumps used in LB7 Duramax engines

✅ Restores precise fuel delivery and rail pressure control

✅ Fixes common start-up and fuel system performance issues

✅ Designed and manufactured to Bosch's exacting OE standards

Vehicle Compatibility:

• 2001–2004.5 Chevrolet Silverado 2500 HD (6.6L Duramax LB7)

• 2001–2004.5 Chevrolet Silverado 3500 (6.6L Duramax LB7)

• 2001–2004.5 GMC Sierra 2500 HD (6.6L Duramax LB7)

• 2001–2004.5 GMC Sierra 3500 (6.6L Duramax LB7)

Specifications:

• Manufacturer: Bosch

• Part Number: 1465ZS0044

• Component: Fuel Control Actuator (FCA) / MPROP

• Function: Fuel metering valve for CP3 injection pump

Don’t let a failing FCA leave your Duramax stranded—replace it with a brand-new Bosch OEM actuator and restore reliable starts and performance.