P0090: How to Diagnose & Fix — Fuel Pressure Regulator 1 Control Circuit
2 vehicles · 2 makes · $600-$1,400 repair
How to diagnose and fix P0090: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
GMC Terrain · 2021–2023
On 1.5L turbo Terrains, a component inside the high-pressure fuel pump can fracture prematurely, generating metallic debris that migrates through the fuel line and blocks the injector inlets, starving the engine of fuel and causing sudden stalling and loss of power while driving - a crash risk. GM recall N222372310 (NHTSA 23V-013) covers the 2022 Terrain; broader inadequate-fuel-flow actions span the 2021-2023 range.
Common Symptoms
- Sudden engine stall while driving
- Loss of power/propulsion
- Hard starting or no-start
- Check engine light
- Rough running
How to Fix
Under recall, dealers replace the fuel pump module and update the engine control software free of charge. Owners should verify their VIN against open recalls via NHTSA or a GMC dealer.
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Sources for this issue (1)
Chevrolet Traverse · 2009–2023
Every direct-injected 3.6L V6 in the Traverse runs a cam-driven high-pressure fuel pump mounted in the valley that steps rail pressure up past 2,000 PSI. The pump's internal plunger seal and check valve wear, and the follower/cam lobe interface can wear as well, so rail pressure falls below the commanded value. Owners see progressively longer crank times, then a hot-restart no-start, then a hard stumble and reduced power under load. A failing pump can also dilute the engine oil with fuel, which accelerates every other wear item on an engine already known for timing chain and phaser trouble. Traverse Forum carries multi-page HPFP replacement threads across the LLT, LFX and LFY.
Common Symptoms
- Extended crank before start
- Crank but no start when hot
- Check engine light with low fuel rail pressure
- Loss of power under acceleration
- Fuel smell in engine oil
- Rough running and misfire under load
How to Fix
Do not replace the pump on the code alone. First verify low-side supply pressure from the in-tank module (roughly 50-70 PSI); a weak lift pump produces the same low-rail codes and will destroy a new high-pressure pump. With supply confirmed, replace the high-pressure fuel pump, its seal and the pump-to-rail line, and inspect the camshaft lobe and pump follower for wear before assembly. Change the engine oil and filter afterward if the oil smells of fuel. Because the pump sits under the intake in the engine valley, plan on significant labor. No recall or special coverage exists for this failure — it is a wear item and is billed as one.
Sources for this issue (4)
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P0090 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0090 mean?
P0090 stands for "Fuel Pressure Regulator 1 Control Circuit." The PCM detects a general fault in the control circuit for fuel pressure regulator 1 (the electrically controlled regulator/valve that sets rail pressure).
What are the most common causes of P0090?
The most common causes of P0090 are: Failed fuel pressure regulator/control valve, Open/shorted wiring or connector, Corroded connector, PCM driver fault. The specific cause varies by vehicle.
How much does it cost to fix P0090?
Repair costs for P0090 range from $600 to $1,400, depending on the vehicle and root cause.
Which vehicles are affected by P0090?
Au7o has documented P0090 across 2 vehicle models from 2 manufacturers: Chevrolet, GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.