What is OBD-II and does my car support it?

OBD-II (On-Board Diagnostics II) is a standardized system in all cars manufactured after 1996 in the US and 2001 in the EU. If your car was built after these dates, it almost certainly has an OBD-II port, typically located under the dashboard near the steering column.

How does GaugeAI diagnose car problems?

GaugeAI uses advanced AI models trained on millions of diagnostic records to analyze your OBD-II error codes, sensor data, and vehicle information. It cross-references manufacturer-specific databases to provide accurate, plain-English explanations and repair recommendations.

What OBD-II scanners are compatible with GaugeAI?

GaugeAI works with any ELM327-based Bluetooth or WiFi OBD-II scanner. Popular options include BAFX Products, Veepeak, and BlueDriver. You can also upload data manually through photos, CSV files, or raw diagnostic logs.

Is GaugeAI accurate enough to replace a mechanic?

GaugeAI achieves 99.2% accuracy in code interpretation and provides detailed repair guidance. While it is an excellent first-line diagnostic tool that can save unnecessary mechanic visits, we recommend professional inspection for complex repairs and safety-critical issues.

Which car brands and models does GaugeAI support?

GaugeAI supports over 10,000 vehicle models across all major manufacturers including Toyota, Honda, BMW, Mercedes-Benz, Ford, Chevrolet, Hyundai, Kia, Volkswagen, Nissan, Changan, and many more. Our AI is trained on manufacturer-specific diagnostic data for more precise results.

How much does GaugeAI cost?

GaugeAI offers a free plan with 5 diagnostic scans per month. Our Pro plan at $14/month includes unlimited scans, full diagnostic history, repair cost estimates, and priority AI analysis. Fleet plans start at $89/month for businesses managing multiple vehicles.

Is my vehicle data secure and private?

Absolutely. All diagnostic data is encrypted in transit and at rest using AES-256 encryption. We never share your vehicle data with third parties. You can delete your data at any time from your account settings. We are SOC 2 Type II compliant.

Can I use GaugeAI without an OBD-II scanner?

Yes. While direct OBD-II connection gives the most comprehensive results, you can also upload photos of your dashboard warning lights, paste error codes manually, upload CSV data exports from other tools, or share scanner screenshots for AI analysis.

Critical SeverityDo Not Drive

What does P0335 mean?

Crankshaft Position Sensor "A" Circuit Malfunction

Direct Answer

P0335 means the ECM is not receiving a valid signal from the crankshaft position sensor (CKP). The CKP tells the ECM exactly where each piston is in its cycle — without this signal, the ECM cannot calculate correct ignition timing or fuel injection timing, and the engine may not start at all.

Common Symptoms

✓Check engine light on
✓Engine stalls intermittently or without warning
✓Hard starting or no start
✓Engine cranks but does not fire
✓Rough running and misfires

Common Causes

01Failed crankshaft position sensor
02Damaged CKP sensor wiring or connector
03Damaged tone ring (reluctor wheel) on the crankshaft
04Excessive air gap between sensor and tone ring
05ECM fault (rare)

How to Fix P0335

Inspect the sensor wiring and connector

Corrosion, chafed wires, or a loose connector are common causes. Clean the connector with electrical contact cleaner and inspect insulation.

Check sensor air gap

The sensor must be the correct distance from the tone ring. On some vehicles, shims adjust this gap. Incorrect gap causes weak or intermittent signal.

Replace the crankshaft position sensor

This is a relatively straightforward replacement on most engines — the sensor bolts into the block near the crankshaft. Cost is low; most of the expense is labor on difficult-access locations.

Inspect the tone ring

A damaged or corroded reluctor wheel causes intermittent signal loss. Inspect through the sensor opening with a light.

Frequently Asked Questions

Can a bad crankshaft sensor prevent my car from starting?

Yes. The ECM needs crankshaft position data to fire injectors and spark plugs in sync with piston position. Without a valid CKP signal, the engine will crank but not start.

Can I drive with P0335?

No. A failing CKP sensor can cause sudden stalling at highway speed with no warning, which is a serious safety risk. Address this immediately.

Estimated Repair Cost

$50–$500

Sensor: $20–$80. Labor: $100–$400 depending on location.

Safe to Drive?

No — avoid driving

Do not drive. The engine can stall without warning, which is dangerous at speed.

Related Codes

P0336P0339P0016 P0340

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