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2022 M3 G80 Rough Idling & Long Cranks - HPFP Failure?

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Mike T. · rep 0 · May 25, 2:58 AM · 1 replies · solved · Question

Vehicle: 2022 BMW M3 Competition

Hello fellow M owners,

I've got a 2022 BMW M3 Competition (G80) with about 30,000 miles on it, and I'm starting to experience some concerning symptoms. For the past week or so, I've noticed the car has been taking longer to crank before starting, especially when cold. Once it starts, the idle is noticeably rougher than usual, with slight fluctuations in RPM.

Yesterday, I finally got a Check Engine Light. I scanned it and received codes P0087 (Fuel Rail/System Pressure - Too Low) and P008A (Low Pressure Fuel System Sensor Circuit Range/Performance). I'm running 93 octane fuel exclusively. This sounds a lot like a high-pressure fuel pump (HPFP) issue to me.

Has anyone with an S58 engine in a G80/G82 M3/M4 encountered this? Is it a known issue for these newer models? What was your experience with warranty coverage for this kind of problem?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:58 AM

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ClearTheCode admin answer:

Your symptoms of long cranks, rough idling, and the specific OBD codes P0087 and P008A are strong indicators of a high-pressure fuel pump (HPFP) failure on your 2022 BMW M3 Competition (S58 engine). While the S58 is a robust engine, HPFP issues can occur, though perhaps less frequently than on some earlier BMW generations.

  1. Symptoms Match: Long cranking times, particularly when cold, are a classic symptom of the HPFP struggling to build adequate fuel pressure quickly. Rough idling and fluctuations in RPM are also consistent with insufficient or inconsistent fuel delivery to the injectors, which the HPFP is responsible for maintaining at high pressures.

  2. OBD Codes: P0087 (Fuel Rail/System Pressure - Too Low) directly points to an issue with the fuel pressure in the high-pressure system, which is controlled by the HPFP. P008A (Low Pressure Fuel System Sensor Circuit Range/Performance) could indicate a related issue, possibly with the low-pressure fuel pump or sensor, but often works in conjunction with HPFP problems if the high-pressure side isn't drawing enough fuel.

  3. Causes: HPFP failures can be caused by various factors, including wear and tear on internal components, manufacturing defects, or sometimes contamination in the fuel system. While using 93 octane is good, it doesn't prevent mechanical wear. The S58's HPFP operates under immense pressure, and over time, components can degrade.

  4. When to See a Shop: You should take your M3 to a BMW dealership or a specialized M-car performance shop as soon as possible. Driving with a failing HPFP can lead to engine performance issues, potential misfires, and in severe cases, could cause damage to other fuel system components or catalytic converters due to an overly rich or lean condition. Since your car is a 2022 model with 30,000 miles, it should still be under the factory warranty (4 years/50,000 miles), so this repair should be covered.

  5. Diagnostics & Repair: The shop will perform a detailed diagnostic scan, monitor fuel pressure readings (both low and high pressure), and likely confirm the HPFP's inability to maintain target pressure. The repair will involve replacing the HPFP. Ensure they also check the low-pressure fuel pump and filter as part of a comprehensive diagnosis.

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