P1023: Manufacturer-Specific Powertrain Fault (BMW Valvetronic Adjustment Range)
6 vehicles · 1 makes · $150-$4,000 repair
Most Reported On
P1023 is an OBD-II diagnostic trouble code meaning “Manufacturer-Specific Powertrain Fault (BMW Valvetronic Adjustment Range).” P1023 is a manufacturer-specific powertrain code whose meaning depends on the automaker; on BMW/MINI engines it is generally associated with the Valvetronic system's adjustment range (the eccentric shaft not reaching or maintaining a commanded position). In broad terms it indicates the variable valve-lift mechanism is not adjusting correctly within its expected range, which can affect idle quality, power, and emissions. Other makers may use this code for a different powertrain fault, so the exact meaning should be confirmed against the vehicle's service data. This code is most commonly reported on 2008-2013 BMW M3, 2017-2024 BMW M240i, and 2009-2015 BMW 7 Series (750Li, 750i, 750iL), plus 3 other vehicles, with repair costs ranging from $150 to $4,000.
Common Causes
Typical Repair Cost
Based on 8 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1023 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
Vehicles Affected (6)
VANOS Solenoid Wear and Failure
VANOS Solenoid O-Ring Failure
N63 Valvetronic Motor Failure - F01/F02 750i/750Li
VANOS Unit Failure (S54 Double-VANOS)
VANOS Solenoid Failure (S65 V8)
VANOS Solenoid Failure (N52, N55 Engines)
VANOS Seal Failure (M52/M54/S52)
N55 VANOS Solenoid Failure - 435i/440i F32/F33/F36
FAQ
What does P1023 mean?
P1023 stands for "Manufacturer-Specific Powertrain Fault (BMW Valvetronic Adjustment Range)." P1023 is a manufacturer-specific powertrain code whose meaning depends on the automaker; on BMW/MINI engines it is generally associated with the Valvetronic system's adjustment range (the eccentric shaft not reaching or maintaining a commanded position). In broad terms it indicates the variable valve-lift mechanism is not adjusting correctly within its expected range, which can affect idle quality, power, and emissions. Other makers may use this code for a different powertrain fault, so the exact meaning should be confirmed against the vehicle's service data.
What are the most common causes of P1023?
The most common causes of P1023 are: Faulty Valvetronic eccentric shaft sensor, Oil contamination from a leaking valve cover gasket, Valvetronic actuator motor weak or binding, Mechanical wear/binding in the eccentric shaft assembly, Wiring or connector fault in the circuit, Low engine oil level/condition affecting Valvetronic operation. The specific cause varies by vehicle.
How much does it cost to fix P1023?
Repair costs for P1023 range from $150 to $4,000, depending on the vehicle and root cause.
Which vehicles are affected by P1023?
Au7o has documented P1023 across 6 vehicle models from 1 manufacturers: BMW.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.