P0335 on 2006-2013 BMW with N52/N53 Engine: Crank Sensor Causes and Fixes

What's Unique About the 2006-2013 BMW Multiple

For the N52 and N53 engines, the story of P0335 is one of difficult access. The crankshaft position sensor is notoriously buried on the driver's side of the engine block, tucked underneath the starter motor and intake manifold. While the sensor itself is a common failure item on many cars, on this platform, the labor to reach it is the main challenge. The standard procedure requires the complete removal of the intake manifold, turning a simple part swap into a multi-hour job 🎬 See this walkthrough for removing the manifold and replacing the sensor. that can be daunting for a novice DIYer.

Symptoms You May Notice

• Engine takes a long time to crank before starting (extended crank).
• Engine cranks but does not start at all.
• Engine stalls unexpectedly while driving or at idle.
• Rough, unstable, or fluctuating idle.
• Noticeable loss of power and sluggish acceleration.
• Check Engine Light is illuminated.
• Transmission may enter 'limp mode,' getting stuck in one gear.
• Symptoms may be intermittent or only appear when the engine is warm.

Most Likely Causes

1. Failed Crankshaft Position Sensor 🔴 High Probability The sensor is located in a high-heat area of the engine bay, and years of heat cycles cause the internal electronics and magnetics to degrade and fail. Oil leaks from components above, such as the valve cover gasket or oil filter housing gasket, can also contaminate the sensor and its wiring, accelerating failure.
   How to confirm: If the engine cranks but there is no RPM reading on a live data scanner, the sensor is the primary suspect. Testing the sensor's output with an oscilloscope is the most definitive test. Given the difficult access, many owners opt to replace the sensor as a primary diagnostic step if the code is present.
   Typical fix: Replace the crankshaft position sensor and its O-ring. It is critical to use a high-quality OEM or OE-supplier part (like VDO/Continental) as cheap aftermarket sensors are known to fail prematurely or be dead on arrival.
   Est. part cost: $60-$120
2. Damaged Wiring or Loose Connector 🟡 Medium Probability The sensor's wiring is routed near hot and vibrating components, like the starter and exhaust. The plastic connector can become brittle and break, or the pins can get corroded. This is a common issue after a nearby repair, like a starter or clutch replacement, where the wiring may have been disturbed or not re-secured properly.
   How to confirm: Visually inspect the wiring harness leading to the sensor for any signs of melting, chafing, or breaks. Check that the connector is securely plugged in and that the locking tab is intact. Inspect its pins for corrosion or damage.
   Typical fix: Repair the damaged section of the wiring harness or replace the connector pigtail. Ensure the connector is clean and securely fastened with a click.
   Est. part cost: $15-$50

Rare But Worth Checking

• Damaged Reluctor Wheel: The toothed wheel on the crankshaft that the sensor reads can be damaged, have missing teeth, or be excessively rusty, causing an erratic signal. This is very uncommon but can happen, especially if the engine has been previously disassembled.
• Faulty Engine Control Module (DME): In very rare cases, the fault may lie within the DME itself, where it is unable to process the signal from a known-good sensor. This should only be considered after all other possibilities, including wiring and the sensor itself, have been exhaustively ruled out.
• Blown Fuse: In some BMW models, the crankshaft position sensor circuit is protected by a dedicated fuse located in the main engine electronics box (E-box). A blown fuse will cause a complete loss of signal and a P0335 code.

Diagnosis Steps

1. Connect an OBD-II scanner and confirm the P0335 code is present. Use a BMW-specific scanner for more detailed fault codes if possible.
2. Monitor live data on the scanner while cranking the engine. Look for an RPM signal. If the RPM reads 0 while the engine is turning over, the DME is not receiving a signal from the sensor.
3. Perform a visual inspection. Raise the vehicle safely. Locate the sensor on the driver's side of the engine block, below the starter motor. 🎬 Watch this video to see the exact sensor location on N52 engines. Check the sensor's connector for looseness, corrosion, or oil contamination. Inspect the wiring harness for any signs of damage, melting, or chafing against other components.
4. If wiring looks good, the next step is to test the sensor. This can be done with a multimeter by checking for voltage and ground at the connector, but an oscilloscope is required to properly view the sensor's signal waveform.
5. If the sensor and wiring test good, check the dedicated fuse for the crankshaft sensor in the E-box under the hood.
6. Given the high failure rate of the sensor and the difficult access, if you have to remove the intake manifold to inspect the wiring, it is highly recommended to replace the sensor with an OEM/VDO part at the same time.

Parts You'll Likely Need

• Crankshaft Position Sensor (OEM #13627525015) — This is the most common failure item for code P0335. The sensor's internal electronics fail from prolonged exposure to engine heat.
  Trusted brands: VDO (OEM), Continental (OEM), Hella
  OEM price range: $80-$120
  Aftermarket price range: $45-$75
• Sensor O-Ring (OEM #12141748398) — A new O-ring is required to seal the sensor in the engine block. It is often sold separately from the sensor.
  Trusted brands: Genuine BMW, Elring
  OEM price range: $2-$5
  Aftermarket price range: $1-$3
• Intake Manifold Gasket Set (OEM #11617547242) — If the intake manifold is removed to access the sensor (the most common method), these six individual gaskets must be replaced to prevent vacuum leaks.
  Trusted brands: Victor Reinz, Elring, Genuine BMW
  OEM price range: $30-$50
  Aftermarket price range: $20-$40

Related Codes That Often Appear With This One

• P0336-P0339 — These are all related codes for the crankshaft position sensor circuit, indicating different types of faults (e.g., range/performance, intermittent).
• P1727 — This is a BMW-specific code indicating a CAN message from the DME/DDE is missing. It's often triggered by the lack of a valid crankshaft signal, which is critical data the transmission control module needs to operate correctly.
• 2E94 — This is a BMW-specific fault code that directly translates to a problem with the crankshaft sensor.

Platform-Specific Known Issues

• Difficult Sensor Location: The primary issue for the N52/N53 engine is the sensor's location. Most repair procedures require removing the entire intake manifold to gain sufficient access, significantly increasing labor time and complexity.
• Replacement from Below (Advanced DIY): Some experienced DIYers have managed to replace the sensor from underneath the car without removing the manifold. This method is faster but requires working in a very tight space with specific tools like a small ratchet, multiple extensions, a swivel socket, and an E8 or E10 external Torx socket (reports vary). This approach is challenging due to poor visibility and the risk of dropping the bolt or tools.
• Broken Bolt During Removal: In some cases, the small external Torx bolt holding the sensor can be seized and break during removal, which dramatically complicates the repair, potentially requiring removal of the starter motor for access to extract the broken bolt.

Mechanic-Grade Diagnostic Values

• Crankshaft Position Sensor Connector Voltage (Key On, Engine Off) — expected: Pin 1 (Orange wire): ~12V (Battery Voltage). Pin 2 (Black/White wire): Ground. Pin 3 (Yellow wire): ~5V (DME Reference Voltage).. Failure: No voltage on Pin 1 or Pin 3 indicates a wiring or DME power supply issue. No ground continuity on Pin 2 points to a bad ground.
• Crankshaft Position Sensor Signal Test (Hall Effect Sensor) — expected: Using a multimeter on the signal wire (Yellow), the voltage should switch between ~5V and ~0V when a metal object is passed in front of the sensor tip.. Failure: Voltage that does not switch, is stuck high or low, or switches intermittently indicates a faulty sensor. An oscilloscope is the preferred tool to see the square wave signal clearly.

Hidden / Shadow Codes Worth Checking

• 2A94: This is a common BMW-specific fault code for 'Crankshaft Sensor, Signal'. It is the direct equivalent of the generic P0335 code and will often appear alongside it or by itself when using BMW-specific diagnostic software like ISTA. (see via BMW-specific scan tools like ISTA, or advanced aftermarket scanners with BMW software (e.g., Foxwell, Autel, MHD).)
• 3100: This is a shadow code for 'Boost-pressure control, deactivation' that is often triggered as a consequence of the 2A94/P0335 fault. The DME deactivates boost control as a protective measure when it loses the critical crankshaft signal. (see via BMW-specific scan tools that can read shadow or secondary fault codes.)

Scan Tool Commands That Help

• ISTA: Delete engine adaptation values — After replacing the crankshaft position sensor or performing other major engine repairs, it is recommended to reset all engine adaptations. This forces the DME to relearn values for fuel trim, idle, and flywheel position with the new sensor data. The path is: Vehicle management > Service function > Power train > Engine Electronics > Adjustment functions > Delete engine adaptation values.
• ISTA: Flywheel Adaptation (Increment Wheel) — If running issues persist after clearing adaptations, a specific flywheel re-adaptation may be needed. This involves a specific drive cycle procedure where the car is accelerated and then allowed to coast down in gear for 7-10 seconds, repeated three times, to allow the DME to learn the exact pattern of the reluctor wheel.

Wiring & Ground Locations

• Engine Ground Strap — On the driver's side (US models), connecting the engine block/oil pan area to the chassis, located underneath the car near the driver's seat area.. A corroded or loose main engine ground strap can cause a voltage drop and introduce electrical noise into the system. This can affect sensitive sensors like the crankshaft position sensor, leading to intermittent signals, a no-start condition, and codes like P0335, even if the sensor and its direct wiring are good.
• Crankshaft Sensor Connector (X6214) — On the driver's side of the engine block, below the starter motor. The wiring consists of an Orange wire (12V Power), a Black/White wire (Ground), and a Yellow wire (Signal).. This is the primary point of failure for wiring issues. The connector can become brittle from heat, and oil leaks can saturate the connection, causing poor contact and signal loss.
• DME Connector X60005 — In the electronics box (E-box) in the engine bay, under the passenger-side cabin air filter housing.. This is where the crankshaft sensor wiring terminates at the DME. The signal wire (Yellow) connects to Pin 29, and the ground wire (Black/Blue) connects to Pin 30. Testing for signal continuity and voltage here can rule out the entire wiring harness between the sensor and the DME.

Real Owner Repair Stories

• Bimmerpost user 'tofu?' (BMW E93 328i) — Car would shudder on acceleration, have rough shifting, misfires at idle, loss of power, and multiple dash lights including limp mode. Threw code 2A94 (P0335).
  ❌ Tried (didn't work) Replacing the crankshaft position sensor with a new one.
  ✅ What actually fixed it The replacement sensor was defective from the factory. Replacing the 'new' sensor with another new genuine Continental sensor resolved all issues. The car ran perfectly for over a month after the second replacement.
• Bimmerfest user (BMW 335i (N54 engine, similar issue)) — Sudden engine and transmission malfunction warnings, car stuck in 3rd gear (limp mode), long crank times, and stalling on cold starts. Codes 2A94 (Crankshaft Sensor) and 3100 (Boost loss).
  ❌ Tried (didn't work) Replacing both VANOS solenoids., Replacing the crankshaft position sensor with a new one from the dealer., Checking every fuse in the fuse box with a multimeter.
  ✅ What actually fixed it The user's post ends without a final resolution, highlighting a common scenario where standard fixes fail, pointing towards a more complex wiring or DME issue that often requires professional diagnosis.

OEM Part Supersession History

• 13627525015 → None, this is the current part number. — N/A
  Heads up: While the part number has remained stable, it is critical to use the OEM sensor from VDO/Continental or Genuine BMW. Aftermarket versions are widely reported to be dead-on-arrival or fail prematurely, causing the P0335 code to return.

Diagnostic Flowchart

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this repair, sourcing used parts is generally not recommended for the sensor itself. However, if the wiring connector pigtail is broken, a used pigtail from a junkyard harness can be a cost-effective solution, provided the plastic is not brittle and the pins are clean.

Donor-vehicle mileage cap: roughly under 80000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a wiring pigtail, check for any signs of cracking, brittleness, or melting on the plastic connector.
• Ensure the locking tab is intact and functional.
• Inspect the wire insulation for at least 6 inches back from the connector for any chafing, cuts, or heat damage.
• Look at the metal pins inside the connector for any green or white corrosion.

OEM-only on this vehicle (don't cheap out):

• Crankshaft Position Sensor

Aftermarket brands forum-validated for this vehicle:

• VDO (OEM)
• Continental (OEM)
• Hella

Brands owners have reported issues with on this vehicle:

• Unbranded or generic 'white-box' sensors from online marketplaces are frequently reported as faulty.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Documented NHTSA Reports

Related OBD-II Codes

• P0336 — Indicates a 'Circuit Range/Performance' issue with the same crankshaft position sensor. This code often appears with P0335 when the sensor is failing intermittently or the wiring is damaged, causing an erratic but not completely absent signal.
• P0340 — Camshaft Position Sensor Circuit Malfunction. The DME compares signals from the crankshaft and camshaft sensors to verify engine timing. A missing or incorrect signal from the crank sensor can cause the DME to flag a correlation fault with the cam sensor, even if the cam sensor is working correctly.
• P0300-P0306 — Misfire codes (P0300 for random, P0301-P0306 for specific cylinders). The crankshaft sensor provides the primary engine speed and position data needed for ignition timing. An incorrect signal can cause the DME to fire the spark plugs at the wrong time, leading to misfires.
• P17XX OR UXXXX — Transmission-related or communication codes. The transmission control module relies on the engine RPM signal from the DME to shift correctly. When the P0335 code is present, the DME loses this signal, which can cause the transmission to enter a 'limp mode' and set communication or performance faults.

Frequently Asked Questions