P0089 and P2293 and engine shutdown at full throttle at high rpm

[username_unavailabe]

Hey everyone,

I have an Infiniti FX30d (3.0 V6 diesel, V9X engine) with 200,000 km on the original timing chain. Lately, I’ve been experiencing a sudden engine shutdown under full acceleration, but I can restart the car immediately. No limp mode, just a check engine light.

What Happened?​

A few days ago, I was driving normally with a fully warmed-up engine, doing only casual accelerations—nothing high-RPM. Then, I decided to overtake a truck, so I hit the gas, got a nice downshift, and started pulling like usual.

Midway through the overtake, the car suddenly stopped pulling, the dashboard lit up like a Christmas tree, and the clutch disengaged (automatic transmission). The engine progressively stalled, but I was still rolling.

I quickly put it in neutral and pulled over. At first, I couldn't shut the car off (I have a push-button start, and it didn’t respond), but after about 30 seconds, the car shut down on its own (only the electronics, the engine stalled in around 5 seconds).

After that, I was able to restart the car normally with no strange noises or hesitation. It drove away as if nothing had happened.

I stopped at a gas station and scanned for DTCs—I found P0089 (Fuel Pressure Regulator Performance - Pending) and P2293 (Fuel Pressure Regulator 2 Performance). I read a few things online and figured I should be safe to drive home.

I added injector cleaner to the tank and continued driving normally. However, when I was close to home, I decided to floor it again to see if I could recreate the issue.

Sure enough, the exact same thing happened.

• At 3,000 RPM, it threw a code (I noticed because cruise control disabled itself).
• At 3,800 RPM, the engine suddenly lost power and progressively stalled.
• I coasted the last 100m home, restarted the car in the garage, and confirmed the same two DTC codes had appeared.

Symptoms & Observations:​

• At steady driving, the car runs fine.
• Under full throttle (~3,800+ RPM), the engine suddenly stops pulling (almost like a sudden clutch disengagement) then progressively dies, almost like stalling.
• If I let off the throttle in time (around 3000 RPM), it doesn’t stall, but still throws a DTC.
• DTC codes: P0089 (Fuel Pressure Regulator Performance - Marked as Pending on OBDII) & P2293 (Fuel Pressure Regulator 2 Performance).
• When I suddenly accelerate from steady throttle, it throws a code immediately (after the downshift to around 3000 RPM).
• No misfires, no rough idle, no loss of power at low/mid RPMs. I can make the car accelerate pretty hard, if I keep the RPM under 3000 with no issues.

At first, I was worried about the timing chain, but since the car restarted normally, I initially ruled that out. However, after thinking more about it, I wonder if the chain jumped a tooth only on the HPFP.

I've also read that air getting into the fuel system could cause similar symptoms, so I plan to check for that first unless someone has a better idea.