OBD-II code P0335 is associated with the Crankshaft Position Sensor “A” Circuit Malfunction. The crankshaft position sensor plays a pivotal role in monitoring the position and rotational speed of the engine’s crankshaft. This data is vital for the Engine Control Module (ECM) to make essential decisions, such as determining the optimal timing for fuel injection and ignition.

More about the code

When P0335 is triggered, it indicates that there’s an irregularity or malfunction in the crankshaft position sensor’s circuit. This could be due to issues with the sensor itself, the wiring connecting it, or even the ECM. Such a fault can cause various drivability problems, ranging from poor engine performance to the engine failing to start.

Causes of OBD-II Code P0335

Diving deeper into the code’s nature, several underlying issues can lead to this code:

  1. Faulty Sensor. The most straightforward cause can be the crankshaft position sensor itself failing or becoming erratic in its readings.
  2. Wiring and Connectors. Damaged, corroded, or loose wiring and connectors associated with the sensor can interfere with the correct transmission of signals, causing the code to be set.
  3. Damaged Reluctor Ring. The sensor reads the crankshaft’s position from a reluctor ring. If this ring is damaged or misaligned, it can disrupt the sensor’s readings.
  4. Electrical Interference. Sometimes, other electronic components or wiring nearby can produce interference that disrupts the sensor’s signal.
  5. Engine Control Module (ECM) Issues. Though rarer, a malfunctioning ECM can misinterpret the signal from the crankshaft position sensor, setting off the P0335 code.
  6. Timing Components. Worn or damaged timing components, such as a timing belt or chain, might affect the crankshaft’s movement and subsequently the sensor’s readings.

Related DTCs to P0335

P0300, P030X, P0336, P0337, P0338, P0339, P0340, P0341, P0342, P0343, P0344, P0345, P0346, P0347, P0348, P0349, P0725


There is no average total cost to get it fixed because it depends of the underlying issues. However, a general estimate based on common scenarios looks like:

  • Crankshaft Position Sensor Replacement. The part itself usually costs between $40 and $200, depending on the vehicle’s make and model. Labor can range from $50 to $150, so the total might be in the ballpark of $90 to $350.
  • Wiring Repair. If the issue is with the wiring or connectors, you might be looking at an hour or two of labor, which translates to about $50 to $200, depending on labor rates.
  • ECM Issues. Replacing or reprogramming the ECM is more expensive. An ECM can cost anywhere from $500 to $1,500 or more, with labor potentially adding another $100 to $200.
  • Additional Diagnostics. Sometimes, the problem might not be immediately apparent, requiring extended diagnostic time. This can add to the labor cost.

Driving with a P0335 code is generally not recommended. There some certain reasons why it may be unsafe or cause the danger to the vehicle or engine in particular. Here they are:

  • the engine can run inefficiently or even misfire;
  • the engine might stall unexpectedly or have difficulty starting;
  • the engine might not start, leaving you stranded;
  • potential for more expensive problems down the line;
  • decreased fuel economy;
  • the unpredictability of engine behavior (like sudden stalling) can be a safety hazard (for the instance when driving on a high speeds).

A weak or failing battery might indirectly contribute to this error code in some circumstances. As the crankshaft position sensor and many other engine sensors require a stable voltage supply, a weak battery can cause fluctuations or drops in the voltage supplied to these sensors. Additionally, a bad battery can create electrical noise or interference, which might disrupt the signals from various sensors as well as a weak battery might cause the Engine Control Module (ECM) to reset or malfunction, which can lead to various diagnostic trouble codes, including P0335.

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