P0335
Critical Severity (Level 5)Crankshaft Position Sensor "A" Circuit Malfunction
OBD-II diagnostic trouble code P0335indicates a fault detected by the vehicle's onboard computer. This code applies to all OBD-II compliant vehicles and should be addressed promptly to avoid potential engine or emissions system damage.
Severity Level 5 — Critical
This code indicates a critical issue that may cause severe engine damage or complete engine failure. Stop driving immediately and have the vehicle towed to a repair shop. Continuing to drive could result in catastrophic engine damage and costly repairs.
Common Symptoms
- Engine cranks but will not start — this sensor is critical for ignition timing
- Engine stalling while driving (dangerous — can cause loss of power steering and brakes)
- Check Engine Light on
- Intermittent starting problems (starts sometimes, then randomly won't start)
- Tachometer erratic or not working during cranking
Possible Causes
- Faulty crankshaft position sensor — heat-related failure, often fails when engine is hot and works again when cool
- Damaged or corroded wiring/connector at sensor — sensor is often near exhaust manifold, wiring insulation melts over time
- Cracked or broken reluctor ring/flexplate teeth — sensor cannot read crank position
- Excessive air gap between sensor and reluctor ring (out of spec)
- Faulty PCM (rare)
- Broken timing belt or chain — engine won't start AND sensor code sets because crank signal is absent
Common Fixes
- Replace crankshaft position sensor — often 1-bolt and 1-connector job, but location can be hard to reach ($80-300 including labor)
- Repair damaged wiring/connector at sensor ($50-200)
- Replace flexplate or reluctor ring if damaged ($800-2000, requires transmission removal)
- Check timing belt/chain — if broken, major engine repair may be needed ($500-3000)
Estimated Repair Cost
$50 – $3000(typical range; varies by vehicle make and model)
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Explore Repair Costs
Worried about repair costs?
Get transparent estimates and verify your mechanic's quote before authorizing repairs.
Related Discussions
See what other car owners are saying about this code and related repairs.
View P0335 discussions in the community