Your Toyota won’t start, the check engine light is on, and your scanner just spat out a Toyota P0335 code. Frustrating? Absolutely. But here’s the good news — this code has a clear cause, a clear solution, and you don’t need to panic. Stick around, because by the end of this post, you’ll know exactly what’s happening under your hood and what to do next.
What Is Toyota P0335?
Toyota P0335 stands for “Crankshaft Position Sensor ‘A’ Circuit Malfunction.” It means your Engine Control Module (ECM) isn’t receiving a reliable signal from the crankshaft position sensor (CKP).
Why does that matter? Because the ECM uses that signal — called the NE signal — to know the crankshaft’s exact position and speed. Without it, the ECM can’t time your fuel injectors or spark plugs correctly. In many cases, it simply refuses to fire the engine at all to prevent serious mechanical damage.
Think of it as the engine’s heartbeat monitor going offline. No signal, no go.
Two Types of CKP Sensors Toyota Uses
Toyota uses two different sensor technologies depending on the engine generation.
Inductive (Passive) Sensors
These are two-wire, self-generating sensors. They produce an analog AC sine wave signal as reluctor ring teeth pass by. The signal gets stronger as RPM rises, which is why a failing inductive sensor often causes hard starts specifically — it’s weakest when cranking.
Hall Effect (Active) Sensors
These are three-wire sensors that need a 5V reference supply and a ground. They produce a clean digital square wave signal, which works even at very low speeds. You’ll find these on newer Toyota engines like the 2GR-FKS and 2AR-FE.
| Sensor Feature | Inductive (Passive) | Hall Effect (Active) |
|---|---|---|
| Wiring | 2-Wire | 3-Wire |
| Signal Type | Analog AC Sine Wave | Digital Square Wave |
| Power Needed | Self-Generating | 5V Reference Required |
| Common Failure | Internal Resistance Drift | Internal Circuitry Failure |
| Typical Engine | Early 2AZ-FE, 1ZZ-FE | Late 2GR-FKS, 2AR-FE |
Knowing which type your engine uses changes how you test and diagnose the problem.
Toyota P0335 Symptoms You’ll Actually Notice
The symptoms range from “a little annoying” to “completely stranded.” Here’s what to watch for:
- No-start or extended cranking — The most dramatic symptom. The ECM won’t fire the engine without a valid crankshaft signal.
- Engine stalls while driving — Happens when the signal drops out intermittently at speed or operating temperature.
- Rough idle or misfires — Fluctuating timing causes uneven combustion.
- Weak acceleration — The ECM may retard timing to protect the engine.
- Tachometer drops to zero — While the engine is still running. That’s a dead giveaway for a CKP failure.
- VSC and traction control lights — These systems need accurate engine speed data. When the NE signal drops out, they default to disabled.
- Harsh automatic transmission shifts — Transmission controllers rely on engine speed data for shift timing.
If your tach suddenly reads zero while you’re driving, don’t second-guess it — you’ve almost certainly got a CKP issue.
What Actually Causes Toyota P0335
This is where most DIYers go wrong. They replace the sensor immediately without understanding what caused the fault. Here are the real culprits:
Failed or Worn Sensor
Sensors don’t last forever. After 100,000+ miles, inductive sensor coils can develop hairline fractures from constant heat cycling. The fractures open when hot, causing the engine to stall after warmup — then restart fine once it cools down. That pattern is almost always a heat-soak sensor failure.
Oil Contamination
A leaking front main seal can soak the CKP sensor and connector in oil. Engine oil breaks down wire insulation and causes connector seals to swell and fail. If you see oil near the sensor, fix the leak first or the new sensor won’t last long either.
Wiring Harness Damage
Wiring issues cause a significant number of P0335 cases. Common culprits include:
- Rodent damage — Toyota’s soy-based wire insulation is known to attract rodents. Chewed CKP wires are surprisingly common.
- Abrasion — The harness can rub against brackets or heat shields over thousands of miles, eventually wearing through the insulation.
- Corroded connectors — Moisture gets in, copper oxidizes, resistance rises, and the signal dies.
Damaged Reluctor Ring
The CKP sensor tip is magnetic. It attracts metal shavings from the engine or clutch. A build-up of debris on the sensor tip distorts the magnetic field and corrupts the waveform. Physical damage to the reluctor ring teeth — from debris or improper servicing — creates missing pulses that the ECM reads as a circuit malfunction.
Excessive Air Gap
If the sensor can’t sit flush against its mounting surface due to rust or debris, the air gap widens. A wider gap means a weaker signal — especially during low-RPM cranking. This is a common mistake after sensor replacement: forgetting to clean the mounting surface.
Timing Chain Wear
A stretched high-mileage timing chain can throw the crankshaft and camshaft signals out of phase. While this usually sets a correlation code like P0016, severe cases can also trigger P0335 if the ECM can’t lock onto the signal pattern at all.
Engine-Specific Toyota P0335 Issues You Should Know
Different Toyota engines have their own quirks when it comes to P0335.
2AZ-FE (2006–2012 Camry, RAV4) — Check the Camshaft Gear First
This is a critical one. Toyota issued Technical Service Bulletin T-SB-0192-12 covering intermittent P0335 codes on the 2AZ-FE. The cause isn’t the crankshaft sensor — it’s the intake camshaft timing gear assembly. The gear can fail to lock correctly, causing the camshaft to flutter. The ECM compares CKP and CMP signals, and this instability triggers P0335. The fix is replacing the camshaft timing gear, not the CKP sensor. Many people have thrown money at the wrong part here.
2GR-FE (3.5L V6 — Avalon, Highlander, RAV4) — Budget Extra Labor Time
The CKP sensor on the 2GR-FE sits behind the alternator and AC compressor bracket. Getting to it means removing the serpentine belt, disconnecting the alternator, and unbolting the AC compressor. Plan for 3+ hours of labor if you’re paying a shop.
1GR-FE / 2GR-FKS (Tacoma, 4Runner) — Anti-Corrosion Coating Issue
On certain 2016–2017 Tacoma models, the crankshaft timing rotor was manufactured with an excessive anti-corrosion coating. Over time, this coating breaks down and interferes with the sensor’s ability to read the teeth. Toyota issued Safety Recall H0H covering this specific issue, which involves inspecting and potentially replacing the sensor with a revised unit. If you own a 2016–2017 Tacoma, check your VIN before buying any parts.
| Engine | Common Vehicles | Sensor Location | Access Needed |
|---|---|---|---|
| 2AZ-FE | 2006–2012 Camry, RAV4 | Front of block, near pulley | Front wheel/seal removal |
| 2GR-FE | Avalon, RAV4, Highlander | Lower block, RH side | Remove alternator/AC bracket |
| 1GR-FE | Tacoma, 4Runner, Tundra | Behind starter or lower side | High-clearance access needed |
| 2AR-FE | 2012–2022 Camry, RAV4 | Next to crank pulley | Plastic access cover removal |
How to Diagnose Toyota P0335 the Right Way
Don’t just replace the sensor and hope. Work through this systematically.
Step 1: Check the Live Data Stream
Connect a scan tool and watch the “Engine SPD” parameter while cranking. If the engine physically cranks at 200–300 RPM but the scanner shows 0 RPM, the NE signal isn’t reaching the ECM. That narrows it to the sensor, wiring, or connector.
Step 2: Check for Related Codes
If P0016 (camshaft correlation) shows up alongside P0335, you’re likely dealing with a timing chain or camshaft gear issue rather than a sensor failure — especially on the 2AZ-FE.
Step 3: Test the Sensor Directly
For inductive sensors: Disconnect the sensor and measure resistance between its two terminals. On the 2GR-FE, the spec is 985–1,600 ohms when cold. Infinite resistance means an open circuit. Near-zero means a short.
For Hall Effect sensors: Back-probe the connector with the ignition on. Verify 5V on the reference wire and less than 0.1V on the ground wire.
Step 4: Test the Wiring
Run a continuity test from the sensor connector pins to the ECM connector pins. Resistance should be below 1 ohm per wire. Then measure resistance from each signal wire to body ground — it should be 10k ohms or higher. Anything lower means damaged insulation shorting to ground.
Step 5: Use an Oscilloscope if Available
A digital scope gives you the full picture. A healthy inductive sensor produces a clean AC sine wave that rises in amplitude with RPM. Look for the gap in the waveform created by the missing tooth on the reluctor ring. Extra gaps mean physical damage to the ring. Erratic voltage spikes suggest electromagnetic interference from a failed wiring shield.
Replacing the CKP Sensor: What You Must Do Correctly
Even if you’ve got the right part, a sloppy install can bring P0335 right back.
Clean the mounting surface. Any rust, scale, or oil residue that prevents the sensor from sitting flush widens the air gap and weakens the signal — especially during cranking.
Use a new O-ring, lightly oiled. A torn or dry O-ring leads to an oil leak at the sensor bore.
Don’t over-torque the bolt. The plastic housing cracks easily. Stick to the factory specs:
| Engine | Torque (N·m) | Torque (ft-lbf / in-lbf) |
|---|---|---|
| 2GR-FE | 10 N·m | 7 ft·lbf |
| 2AR-FE | 10 N·m | 7 ft·lbf |
| 2TR-FE | 8.5 N·m | 75 in·lbf |
| 1ZZ-FE | 9 N·m | 80 in·lbf |
Route the harness properly. Secure it in the original clips, away from cooling fans and exhaust components. One rub point is all it takes to recreate the exact problem you just fixed.
On wiring repairs: Use crimp connectors with adhesive-lined heat shrink tubing. Avoid soldering in engine bay harnesses — vibration cracks solder joints over time, and you’ll be back to diagnosing an intermittent no-start in six months.
What Does Toyota P0335 Repair Actually Cost?
Costs vary significantly based on your engine and where the sensor is located.
| Toyota Model | Parts Cost | Labor Cost | Total Estimated Cost |
|---|---|---|---|
| Camry | $105–$185 | $150–$250 | $255–$435 |
| Corolla | $80–$145 | $100–$180 | $180–$325 |
| RAV4 | $102–$188 | $211–$310 | $313–$498 |
| Tacoma | $110–$195 | $235–$300 | $345–$495 |
| 4Runner | $155–$250 | $280–$420 | $435–$670 |
| Sienna | $160–$280 | $310–$415 | $470–$695 |
For parts, genuine Toyota OEM sensors run $100–$240. Denso aftermarket sensors — who often manufacture Toyota’s original parts — typically cost $60–$120 and are a solid choice. Generic no-name sensors under $25 have a high failure rate and can produce inaccurate signals that trigger P0335 again immediately.
If your timing belt or water pump is already scheduled, consider having the CKP sensor replaced at the same time on high-mileage vehicles. Access may already be partially done, and sensor failure rates climb past 100,000 miles.
One Last Thing Before You Buy Parts
Toyota P0335 isn’t always a bad sensor. On the 2AZ-FE, it’s often the camshaft timing gear. On 2016–2017 Tacomas, it may be a recalled rotor. On any Toyota, it might be a chewed wire, a corroded connector, or a film of metal shavings on the sensor tip.
Run your diagnostics first. Confirm the signal is actually missing at the ECM before you order anything. The code points to the circuit — your job is to find which part of that circuit failed.
