FSCM Diagnosis — No Fuel, P069E, Dead Pump on GMT900 Trucks

What’s going on

GMT900 trucks (roughly 2007–2013 Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche, Escalade) run a Fuel System Control Module (FSCM / FPCM) that drives the fuel pump. When it’s dead you get no fuel, hard start / no start, and often P069E. We’re the FSCM guys — watch the videos, work the checks below, or call us.

Need help with diag? See our FSCM YouTube playlist, or call 636-795-6960. We are the FSCM experts.

Order a programmed FSCM

Before you test

Verify fuse numbers on your vehicle — labels move around. You’re after the FSCM fuse. If you see a fuel pump fuse and fuel pump relay, don’t sweat them when the truck has an FSCM. GM filled the fuse box out complete, so there’s extra stuff in there that won’t have power. Normal. Don’t freak out.

Then replace the fuel-related fuses that apply (often Fuse 56 ECM 15A and Fuse 21 FSCM 20A — confirm on your lid).

At the bottom of this page you’ll also find the YouTube video for this procedure and the pin-out diagram for the FSCM on 2007-and-newer GM vehicles. Use the diagram so you don’t guess pins.

Steps to diagnose

1. Connect Pin 1 (black ground) to Pin 16 (pink ground).
2. Connect Pin 32 (RD/WH batt +) to Pin 47 (GY fuel pump 12+). This powers the pump to run and checks for a bad fuel pump.
3. Next, check for fuel pump signal at the FSCM.
4. Find the dark green/white wire in Pin 13. With a test light on that wire, turn the key to RUN. If the PCM is commanding the fuel pump on, the test light lights up.

Important — green/white wire conditions. Check for one of these three:

1. Constant 12V power
2. Power only when cranking
3. Power for 3 to 6 seconds with key on

If any of those three show up, wire / PCM integrity passes.

If there’s no power on dark green/white at the FSCM

After the steps above, if you find no power at the FSCM on the dark green/white wire, move to the PCM. At the PCM, check Pin 50 in the black connector for 12V with key on on that same dark green/white wire.

• Power at the PCM → find the break in the wire and repair it.
• No power at the PCM → contact us or call 636-795-6960 about ordering a programmed PCM. We don’t have a direct online PCM buy link — email or phone and we’ll get you sorted.

Scan tool note

If you check the truck with a scan tool, the most common bad-FSCM code is P069E (Fuel System Control Module Request MIL Illumination).

When the module is the problem

If power and ground are good, the pump command is there, and the pump still won’t run (or you’re still stuck with P069E), replace with a new programmed FSCM. We program it for your truck at GMFLASH. $270, free shipping included to the lower 48 via FedEx (Alaska / Hawaii free USPS — pony express vibes; PO Boxes free too).

Order a programmed FSCM

FSCM Pinout

Printable pinout