1. What is P00C6 in BMW X5?

The P00C6 OBD-II code stands for Fuel Trim System High Voltage (Bank 2). For the BMW X5 (2019-2024)—a top-selling European luxury SUV—this code targets the fuel trim system in its 3.0T B58 inline-six engine, standard in xDrive40i, M50i, and xDrive50e trims (paired with 8-speed ZF automatic transmission).

Fuel trim refers to the ECU’s (Digital Motor Electronics) adjustment of fuel delivery to maintain optimal air-fuel ratio (14.7:1 for gasoline). Bank 2 in the X5’s B58 engine includes cylinders 4–6; P00C6 triggers when the ECU detects excessively high voltage (>5V) in Bank 2’s fuel trim control circuit. This signals issues with components like the high-pressure fuel pump (HPFP), fuel injectors, or downstream oxygen (HO2S) sensors—all critical for the B58’s 335HP performance and 25–28 MPG highway efficiency.

BMW X5 Specific Note: This code is widespread in 2020-2023 X5 xDrive40i models, per BMW Technical Service Bulletin (TSB) 22-04-01. The B58’s direct injection system operates at 3,000+ psi, placing high stress on fuel system components; frequent short trips or low-quality gasoline accelerate wear, leading to circuit overvoltage.

2. Common Causes of P00C6 in 2019-2024 X5

P00C6 in BMW X5 B58 models stems from Bank 2 fuel trim circuit overvoltage—below are real-world cases diagnosed with the ICARZONE MA200 V6:

• Faulty High-Pressure Fuel Pump (HPFP) (2021 X5 xDrive40i): An owner with 55,000 miles reported rough idle and reduced acceleration. The MA200 V6’s Fuel Trim Voltage Test showed 6.2V (normal: 0.5–5V) in Bank 2. Replacing the HPFP with OEM #13518686209 (per TSB 22-04-01) fixed P00C6.
• Clogged Fuel Injectors (2020 X5 M50i): An M50i owner’s P00C6 reappeared after HPFP replacement. The MA200 V6’s Injector Balance Test revealed uneven fuel delivery in Bank 2 (cylinders 4–6). Ultrasonic cleaning of injectors (#13538686329) resolved the voltage spike.
• Failed Downstream HO2S Sensor (2019 X5 xDrive40i): A xDrive40i owner’s P00C6 persisted after injector service. The MA200 V6’s HO2S Response Test showed a stuck sensor (Bank 2 Sensor 2), sending incorrect signals to the ECU. Replacing the sensor with OEM #11787643287 stabilized fuel trim voltage.
• ECU Firmware Glitch (2022 X5 xDrive50e): A plug-in hybrid X5 owner’s P00C6 occurred after a software update. The MA200 V6’s ECU Reset and firmware reflash (v3.1.0, matching TSB 23-02-05) fixed the voltage regulation logic in Bank 2.

3. Key Symptoms of P00C6 in X5 B58 Engine

P00C6 symptoms in the BMW X5 focus on fuel delivery and performance—watch for these signs that signal Bank 2 fuel trim overvoltage:

4. BMW X5 Trims/Engines Prone to P00C6

BMW service data highlights these 2019-2024 X5 configurations with the highest P00C6 occurrence rates (all B58/B58TU engines):

5. Diagnose P00C6 with ICARZONE MA200 V6

Diagnose P00C6 in your BMW X5 B58 accurately with the MA200 V6’s BMW-specific fuel system tools. Follow these steps (engine off, key in "ON" position):

Case Example: A 2021 X5 xDrive40i failed Step 2 (6.8V) and Step 5 (TSB 22-04-01 eligible). The MA200 V6’s Component Location Tool guided HPFP access (driver’s side of the engine, above the oil pan). Replacing the HPFP fixed P00C6—verified by test drive (smooth idle, restored MPG to 26 highway).

6. How to Fix P00C6 in BMW X5 xDrive40i

Resolve P00C6 in your X5 with these MA200 V6-verified solutions—tailored to the B58 engine’s fuel system:

1. Replace High-Pressure Fuel Pump (HPFP) (Most Common Fix for TSB 22-04-01)

1. Confirm HPFP failure via MA200 V6’s Step 2. Disconnect the negative battery terminal and relieve fuel pressure (remove fuel pump fuse F27, start engine until it stalls).
2. Locate the HPFP: Mounted on the driver’s side of the B58 engine, above the oil pan (secured by 3 bolts, 1 electrical connector, 1 fuel line).
3. Disconnect the HPFP’s electrical connector and fuel line (use a fuel line disconnect tool to avoid damage to the quick-connect fitting).
4. Remove the 3 mounting bolts (10mm socket) and pull the old HPFP straight out. Install an OEM HPFP:
   • 2019-2021 X5: #13518686209
   • 2022-2024 X5: #13518686210 (updated pressure regulator)
   Replace the fuel line O-ring with OEM #13537605294.
5. Reinstall bolts (torque to 18 ft-lbs), reconnect the fuel line/electrical connector, and replace the fuel pump fuse. Clear P00C6 with MA200 V6 and test drive—verify Bank 2 voltage stays 0.5–5V.

2. Clean/Replace Clogged Fuel Injectors

1. Confirm injector issues via MA200 V6’s Step 3. Remove the engine cover (4 plastic clips) to access the injector rail (Bank 2: rear of the engine).
2. Disconnect the injector electrical connectors (press release tabs) and remove the fuel rail bolts (8mm socket). Lift the rail to access injectors 4–6.
3. Remove injectors (pull straight up) and inspect for carbon buildup. Use an ultrasonic cleaner (#Lisle 19180) with injector cleaning solution to clear clogs—soak for 30 minutes, then run the cleaning cycle.
4. Replace injector O-rings with OEM #13537584297 and reinstall injectors. Reattach the fuel rail (torque bolts to 8 ft-lbs) and reconnect electrical connectors.
5. Retest injector balance with MA200 V6 (variance <2ms) and clear P00C6. Add BMW Fuel System Cleaner (#83122469172) to the gas tank to prevent future clogs.

3. Update ECU Firmware (TSB 23-02-05)

1. Confirm firmware glitch via MA200 V6’s Step 2–4. Connect the MA200 V6 to the X5’s OBD-II port (under the steering wheel) and turn the key to "ON."
2. Select "BMW" > "X5" > "B58 3.0T" > "ECU" > "Firmware Update." The MA200 V6 will detect the current version and download the latest update (matches TSB 23-02-05).
3. Do not turn off the key or disconnect the MA200 V6 during the update (takes 20–25 minutes). The tool will alert you when complete.
4. Restart the X5, retest Bank 2 fuel trim voltage with MA200 V6 (Step 2), and clear P00C6. Verify the ECU maintains 0.5–5V during idle and acceleration.

7. P00C6 Repair Costs & Maintenance Tips

P00C6 repair costs for the BMW X5 B58 vary by cause. Use this table to budget:

Maintenance Tips for BMW X5 B58 Owners

• xDrive40i (urban drivers): Replace the HPFP every 80,000 miles (preventive) — use OEM #13518686210 for 2022+ models to avoid TSB 22-04-01 wear.
• Refuel only with Top Tier detergent gasoline (91+ octane) — low-quality fuel leaves carbon deposits in injectors, causing fuel trim voltage spikes.
• Add BMW Fuel System Cleaner (#83122469172) to the gas tank every 10,000 miles — keeps injectors clean and maintains optimal fuel delivery.
• Inspect the downstream HO2S sensor (Bank 2 Sensor 2) every 60,000 miles — replace if response time exceeds 200ms (test with MA200 V6).
• Perform the MA200 V6’s Fuel Trim Health Check every 15,000 miles — monitor Bank 2 voltage to catch issues before P00C6 triggers.

8. BMW X5-Specific FAQs