U0109 on Chevrolet
Lost Communication With Fuel Pump Control Module "A"
U0109 on Chevrolet vehicles indicates lost communication with fuel pump control module "a". Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado. Sets when a module loses data-bus communication with the Fuel Pump Control Module 'A', which regulates electric fuel pump operation/pressure. Loss of these messages can interrupt fuel delivery. Typical repair costs on Chevrolet range from $250 to $600, depending on the specific model and root cause.
Common Causes of U0109
- •Open, shorted, or chafed bus wiring to the fuel pump control module
- •Corroded or loose module connector / poor ground
- •Blown fuse / lost power feed
- •Low battery voltage
- •Failed fuel pump control module
U0109 on Chevrolet by Model
Chevrolet Silverado(1 issue)
- Fuel Pump Control Module (FPCM/FSCM) Corrosion — Crank, No-Start2007-2013
GMT900 Silverados (and the late GMT800) mount the fuel pump control module / fuel-system control module on an exposed frame-rail bracket where it is constantly hit with road salt, water and debris. The module's connector and internals corrode, and the FPCM then fails to drive the in-tank pump — producing extended cranking, intermittent stalling, and ultimately a crank-but-no-start with no fuel pressure. Because the pump itself is often fine, owners frequently mis-diagnose and replace the in-tank pump first. A common, well-documented salt-belt failure with steady search demand.
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View U0109 across all makes →Frequently Asked Questions
What does U0109 mean on Chevrolet?▼
U0109 stands for "Lost Communication With Fuel Pump Control Module "A"." Sets when a module loses data-bus communication with the Fuel Pump Control Module 'A', which regulates electric fuel pump operation/pressure. Loss of these messages can interrupt fuel delivery. On Chevrolet specifically, this code is documented across 1 model.
What causes U0109 on Chevrolet vehicles?▼
Common causes on Chevrolet: Open, shorted, or chafed bus wiring to the fuel pump control module, Corroded or loose module connector / poor ground, Blown fuse / lost power feed, Low battery voltage, Failed fuel pump control module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0109 on a Chevrolet?▼
Repair costs on Chevrolet range from $250 to $600, depending on the specific model and root cause.
Which Chevrolet models have U0109 documented?▼
Au7o has documented U0109 on 1 Chevrolet model: Silverado.