P0335 high Severity

P0335: Crankshaft Position Sensor A Circuit Malfunction

Engine may not start, may stall during operation, rough idle, misfire, and reduced power due to lack of valid crankshaft position data

Overview

P0335 indicates a malfunction in the crankshaft position sensor A circuit where the engine control module is not receiving an acceptable signal from the crankshaft position sensor, leading to engine performance issues including no‑start, stalling, rough running, or misfires requiring diagnosis of sensor, wiring, tone ring, or control module.

Common Symptoms

  • Check Engine Light illuminated
  • Engine may not start or have difficulty starting
  • Rough idle or misfire
  • Stalling during driving or at idle
  • Reduced acceleration and power

Most Common Causes

Faulty crankshaft position sensor high

Primary and most frequent failure point when no valid signal is present

Damaged, corroded, or loose wiring/connectors in sensor circuit high

Circuit integrity issues often trigger P0335

Damaged or misaligned reluctor (tone) ring on crankshaft medium

Missing teeth or ring issues can prevent proper signal generation

Timing belt/chain problems affecting crankshaft synchronization medium

Secondary engine mechanical cause that can disturb sensor timing

Faulty PCM/ECM low

Rare cause after all other circuit and sensor issues are ruled out

Diagnostic Steps

  1. Connect OBD‑II scanner and confirm presence of P0335 and check for additional codes
    Expected: P0335 present; additional crank/cam related codes may appear
    Interpretation: Verifies code validity and helps identify related circuit faults
  2. Visually inspect crankshaft position sensor, wiring harness, and connector for damage, corrosion, or loose connection
    Expected: No physical damage, secure connectors
    Interpretation: Eliminate obvious circuit faults; damaged components may need repair
  3. Check sensor power supply and ground with multimeter per OEM specs
    Expected: Proper reference voltage and ground present
    Interpretation: Confirms sensor is being powered and grounded correctly
  4. Measure sensor resistance or output waveform with oscilloscope while cranking
    Expected: Resistance within spec or valid square wave signal present
    Interpretation: Determines sensor operability; invalid signal indicates sensor or tone ring issue
  5. Inspect reluctor (tone) ring for missing or damaged teeth
    Expected: Evenly spaced uninterrupted ring teeth
    Interpretation: Damaged ring leads to erratic signal triggering P0335
  6. If all above are normal, consider PCM testing or replacement
    Expected: No faults in external circuit; possible internal PCM fault
    Interpretation: PCM may be cause after exhaustive circuit diagnosis

Repair Solutions

Replace crankshaft position sensor medium
Estimated Cost: $50 - $375

Most common and direct fix for sensor failure

Repair or replace damaged wiring or connectors medium
Estimated Cost: $50 - $300

Essential if wiring integrity issues are found

Replace damaged reluctor (tone) ring hard
Estimated Cost: $95 - $275

More complex repair often requiring access under timing components

Service timing belt/chain if affecting crank timing hard
Estimated Cost: $350 - $1250

Timing component repair typically costly and labor intensive

PCM/ECM reprogram or replacement hard
Estimated Cost: $250 - $2500

Only after confirming circuit and sensor integrity

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Incorrect replacement of crankshaft position sensor without checking wiring/connectors or reluctor ring

Frequently Asked Questions

What is the definition of the P0335 engine code?

When your OBD-II scanner reads P0335, it means: Crankshaft Position Sensor A Circuit Malfunction. This code is related to the vehicle's Sensors.

Is it safe to drive with a P0335 code?

This is a high priority issue. Engine may not start, may stall during operation, rough idle, misfire, and reduced power due to lack of valid crankshaft position data

How do I know if I have code P0335?

You may experience the following: Check Engine Light illuminated, Engine may not start or have difficulty starting, Rough idle or misfire.

What causes the P0335 code?

This code is frequently triggered by: Faulty crankshaft position sensor, Damaged, corroded, or loose wiring/connectors in sensor circuit, Damaged or misaligned reluctor (tone) ring on crankshaft.

Repair cost breakdown for P0335

The cost varies significantly based on the root cause. For example, replacing a Replace damaged reluctor (tone) ring typically costs between $95 and $275, while fixing a PCM/ECM reprogram or replacement can range from $250 to $2500.

Is P0335 a generic or manufacturer-specific code?

The P0335 code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

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