P0089 on Cadillac
Fuel Pressure Regulator 1 Performance
P0089 on Cadillac vehicles indicates fuel pressure regulator 1 performance. Au7o has documented this code across 1 Cadillac model — most commonly on XTS. This code means the engine computer detected that the fuel pressure regulator is not controlling fuel pressure correctly, so actual fuel pressure does not match what the computer commands. It monitors the regulator's ability to maintain proper pressure in the fuel system, usually on direct-injection or high-pressure systems. When pressure drifts too far from target, this code sets. It can cause hard starting, hesitation, reduced power, or stalling. Typical repair costs on Cadillac range from $450 to $950, depending on the specific model and root cause.
Common Causes of P0089
- •Faulty fuel pressure regulator
- •Weak or failing fuel pump
- •Clogged fuel filter or restricted fuel line
- •Dirty or stuck fuel pressure regulator solenoid
- •Wiring or connector fault to the regulator
- •Fuel pressure sensor reading inaccurately
- •Internal mechanical fault in high-pressure fuel pump
P0089 on Cadillac by Model
Cadillac XTS(1 issue)
- High-Pressure Direct-Injection Fuel Pump Failure2013-2019
The engine-mounted high-pressure fuel pump (HPFP) on the GM 3.6L direct-injection V6 is a known wear item that fails on the XTS, causing long crank/no-start (especially warm restart), rough idle, stalling and misfires. The most common codes are P0087 (fuel rail pressure too low), P0089 (fuel pressure regulator performance) and P0191 (rail pressure sensor), often with random misfire P0300. Because the high-pressure pump is cam-driven off the engine, a failing pump can drive adaptive fuel trims that mask early symptoms until it strands the car.
Looking for P0089 on a different make?
View P0089 across all makes →Frequently Asked Questions
What does P0089 mean on Cadillac?▼
P0089 stands for "Fuel Pressure Regulator 1 Performance." This code means the engine computer detected that the fuel pressure regulator is not controlling fuel pressure correctly, so actual fuel pressure does not match what the computer commands. It monitors the regulator's ability to maintain proper pressure in the fuel system, usually on direct-injection or high-pressure systems. When pressure drifts too far from target, this code sets. It can cause hard starting, hesitation, reduced power, or stalling. On Cadillac specifically, this code is documented across 1 model.
What causes P0089 on Cadillac vehicles?▼
Common causes on Cadillac: Faulty fuel pressure regulator, Weak or failing fuel pump, Clogged fuel filter or restricted fuel line, Dirty or stuck fuel pressure regulator solenoid, Wiring or connector fault to the regulator. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0089 on a Cadillac?▼
Repair costs on Cadillac range from $450 to $950, depending on the specific model and root cause.
Which Cadillac models have P0089 documented?▼
Au7o has documented P0089 on 1 Cadillac model: XTS.