P0093 on Chevrolet
Fuel System Leak Detected - Large Leak
P0093 on Chevrolet vehicles indicates fuel system leak detected - large leak. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 2500HD. This code indicates the engine computer detected a large leak in the fuel system, typically a significant drop in fuel rail pressure that it cannot maintain. It is common on high-pressure direct-injection and diesel systems, where the computer watches commanded versus actual fuel pressure. A large pressure loss suggests fuel is escaping or the system cannot build pressure. This can cause hard starting, loss of power, stalling, and is a potential fire hazard if fuel is leaking externally. Typical repair costs on Chevrolet range from $300 to $12,000, depending on the specific model and root cause.
Common Causes of P0093
- •Leaking or cracked high-pressure fuel line or fitting
- •Faulty fuel injector (leaking or stuck open)
- •Failed high-pressure fuel pump
- •Damaged or leaking fuel pressure regulator
- •Loose or degraded fuel system seals/O-rings
- •Faulty fuel rail pressure sensor
- •Restricted fuel supply preventing pressure buildup
P0093 on Chevrolet by Model
Chevrolet Silverado 2500HD(1 issue)
- CP4 High-Pressure Fuel Pump Failure (LML/LGH Duramax)2011-2016
The 2011-2016 Duramax 6.6L diesel uses a Bosch CP4.2 high-pressure fuel injection pump that is prone to catastrophic self-destruction. The CP4 has tight internal tolerances and is not designed for the lower lubricity of American diesel fuel (compared to European diesel). When the pump fails, it sends metallic debris through the entire high-pressure fuel system, contaminating the fuel rails, injectors, and fuel lines. A single CP4 failure typically destroys $8,000-$12,000 worth of fuel system components.
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View P0093 across all makes →Frequently Asked Questions
What does P0093 mean on Chevrolet?▼
P0093 stands for "Fuel System Leak Detected - Large Leak." This code indicates the engine computer detected a large leak in the fuel system, typically a significant drop in fuel rail pressure that it cannot maintain. It is common on high-pressure direct-injection and diesel systems, where the computer watches commanded versus actual fuel pressure. A large pressure loss suggests fuel is escaping or the system cannot build pressure. This can cause hard starting, loss of power, stalling, and is a potential fire hazard if fuel is leaking externally. On Chevrolet specifically, this code is documented across 1 model.
What causes P0093 on Chevrolet vehicles?▼
Common causes on Chevrolet: Leaking or cracked high-pressure fuel line or fitting, Faulty fuel injector (leaking or stuck open), Failed high-pressure fuel pump, Damaged or leaking fuel pressure regulator, Loose or degraded fuel system seals/O-rings. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0093 on a Chevrolet?▼
Repair costs on Chevrolet range from $300 to $12,000, depending on the specific model and root cause.
Which Chevrolet models have P0093 documented?▼
Au7o has documented P0093 on 1 Chevrolet model: Silverado 2500HD.