P0088 on Chevrolet
Fuel Rail/System Pressure - Too High
P0088 on Chevrolet vehicles indicates fuel rail/system pressure - too high. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 2500HD. P0088 means the engine computer detected that fuel rail (or fuel system) pressure is higher than the maximum allowed. On modern direct-injection and high-pressure systems, the computer regulates rail pressure precisely and watches the fuel pressure sensor; if pressure climbs too high, it sets this code to protect injectors and components. Excessive pressure usually points to a stuck or failed pressure regulator/control valve, a restricted return, or a sensor reading fault. Symptoms can include rough running, hard starting, hesitation, or the engine entering a reduced-power mode. Typical repair costs on Chevrolet range from $300 to $12,000, depending on the specific model and root cause.
Common Causes of P0088
- •Faulty fuel pressure regulator or pressure control valve
- •Stuck-closed or restricted fuel return line
- •Failed or inaccurate fuel rail pressure sensor
- •High-pressure fuel pump control fault
- •Wiring/connector issues at the regulator or sensor
- •Clogged fuel return or relief mechanism
- •PCM/ECM control or calibration fault
P0088 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 P0088 across all makes →Frequently Asked Questions
What does P0088 mean on Chevrolet?▼
P0088 stands for "Fuel Rail/System Pressure - Too High." P0088 means the engine computer detected that fuel rail (or fuel system) pressure is higher than the maximum allowed. On modern direct-injection and high-pressure systems, the computer regulates rail pressure precisely and watches the fuel pressure sensor; if pressure climbs too high, it sets this code to protect injectors and components. Excessive pressure usually points to a stuck or failed pressure regulator/control valve, a restricted return, or a sensor reading fault. Symptoms can include rough running, hard starting, hesitation, or the engine entering a reduced-power mode. On Chevrolet specifically, this code is documented across 1 model.
What causes P0088 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty fuel pressure regulator or pressure control valve, Stuck-closed or restricted fuel return line, Failed or inaccurate fuel rail pressure sensor, High-pressure fuel pump control fault, Wiring/connector issues at the regulator or sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0088 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 P0088 documented?▼
Au7o has documented P0088 on 1 Chevrolet model: Silverado 2500HD.