# Engine Cranks But Won't Start: 2020 Toyota Camry Crankshaft Sensor

> ClearTheCode — Is your 2020 Toyota Camry engine cranking but won't start? A faulty crankshaft position sensor is a common culprit. Learn to diagnose and fix this issue quickly.

Source: https://clearthecode.com/articles/engine-crankshaft-position-sensor-failure-toyota-camry-2020
Code: P0335
Author: ClearTheCode

# Engine cranks but won't start due to crankshaft position sensor 2020 Toyota Camry

Few things are as frustrating as turning the key or pressing the start button in your 2020 Toyota Camry, hearing the engine crank vigorously, but having it refuse to fire up. This common scenario often points to a critical component known as the crankshaft position sensor (CPS). This sensor is vital for your Camry's engine to run, as it tells the Engine Control Module (ECM) the exact position and rotational speed of the crankshaft. Without this crucial information, the ECM cannot accurately time the fuel injection and spark delivery, leading to an engine that cranks endlessly but simply won't start.

## What drivers notice on this 2020 Toyota Camry

The primary and most alarming symptom drivers experience with a failing crankshaft position sensor in their 2020 Toyota Camry is the inability to start the engine. You'll hear the starter motor engage and the engine turn over normally, but it lacks the spark and fuel timing necessary to ignite. Before a complete no-start condition, some drivers might notice more subtle issues that escalate over time, indicating the sensor is on its way out.

## At a glance: difficulty, repair cost, and diagnostic workflow

- **Difficulty Rating:** 6/10 — 6/10 — Intermediate diagnostics
- **Common Symptoms:** Engine cranks but won't start: This is the most direct and common symptom. The engine spins, but there's no ignition.; Intermittent stalling: The engine might suddenly die while driving, especially when hot, and then restart after cooling ; Rough idling or misfires: Irregular engine operation, shaking, or a noticeable lack of smoothness when the engine is run; Hesitation or loss of power: The vehicle may feel sluggish during acceleration or struggle to maintain speed.
- **Estimated Repair Cost:** $120–$450 (parts + typical shop labor)
- **OEM Tooling Required:** Standard OBD-II scanner and hand tools

**Diagnostic workflow:**
1. Confirm P0335 with a live scan — note pending vs stored and freeze frame data.
2. Inspect wiring/connectors and related sensors before replacing modules.
3. Clear codes and road-test; re-scan after two drive cycles if the monitor must set.

See the [P0335 code reference](/codes/P0335) and [topic hub](/hubs/fuel-trim-air-metering) for related guides.

## Symptoms and warning signs

While a complete no-start is the most definitive sign, a faulty crankshaft position sensor can manifest in several ways on your 2020 Toyota Camry:

- **Engine cranks but won't start**: This is the most direct and common symptom. The engine spins, but there's no ignition.
- **Intermittent stalling**: The engine might suddenly die while driving, especially when hot, and then restart after cooling down or a few attempts.
- **Rough idling or misfires**: Irregular engine operation, shaking, or a noticeable lack of smoothness when the engine is running.
- **Hesitation or loss of power**: The vehicle may feel sluggish during acceleration or struggle to maintain speed.
- **Check Engine Light (CEL) illuminated**: The ECM will detect an issue with the sensor's signal and illuminate the CEL, often storing a diagnostic trouble code (DTC).
- **Reduced fuel economy**: Although less common, incorrect timing can lead to inefficient combustion and poorer gas mileage.

## How to verify and confirm the issue

Confirming a faulty crankshaft position sensor on your 2020 Toyota Camry involves a few diagnostic steps, ranging from simple visual checks to using specialized tools:

- **Scan for Diagnostic Trouble Codes (DTCs)**: Use an OBD-II scanner to check for codes. A common code associated with a faulty crankshaft position sensor is P0335 (Crankshaft Position Sensor 'A' Circuit Malfunction). If your scan tool displays this code, it strongly indicates a problem with the sensor or its circuit. For more details on specific codes, you can refer to our [related OBD-II code reference](/codes/P0335).
- **Check Live Data (RPM while cranking)**: With the scan tool connected, monitor the engine RPM while attempting to start the vehicle. If the RPM reading stays at 0 or shows erratic, extremely low values while the engine is clearly cranking, it's a strong indicator that the ECM is not receiving a valid signal from the CPS.
- **Visual Inspection**: Locate the crankshaft position sensor (typically near the crankshaft pulley or on the engine block/bell housing). Inspect the sensor and its wiring harness for any visible damage, such as frayed wires, cuts, corrosion on the connector pins, or loose connections. Sometimes, debris can interfere with the sensor's reading.
- **Fuel and Spark Check**: If the engine cranks but won't start, confirm that both fuel and spark are present. You can check for spark at a spark plug (carefully) and listen for the fuel pump priming. If you have fuel pressure but no spark, or spark at incorrect times, the CPS is a prime suspect, as it directly controls ignition timing.
- **Multimeter Testing (Advanced)**: For a more in-depth diagnosis, you can test the sensor's resistance (if it's a magnetic type) or signal output with a multimeter or oscilloscope. This requires knowing the specific sensor type and OEM specifications for your 2020 Camry.

## Common causes (most likely first)

Several factors can lead to a crankshaft position sensor failure in your 2020 Toyota Camry:

- **Internal sensor failure**: This is the most frequent cause. The electronic components or magnetic coils within the sensor can degrade over time due to heat cycling, vibration, or manufacturing defects.
- **Wiring harness damage**: The wires leading to the sensor can become frayed, cut, or corroded, leading to an open circuit or short. This often happens due to exposure to engine heat, oil, or physical abrasion.
- **Connector issues**: The electrical connector connecting the sensor to the wiring harness can become loose, corroded, or have bent pins, preventing a good electrical connection.
- **Reluctor wheel damage or debris**: The crankshaft position sensor reads a tone ring (also called a reluctor wheel) on the crankshaft. Damage to this wheel, or accumulation of metallic debris on it, can interfere with the sensor's ability to generate an accurate signal.
- **ECM/PCM malfunction**: While rare, a faulty Engine Control Module (ECM) or Powertrain Control Module (PCM) could fail to process the sensor's signal correctly. This is usually ruled out after confirming the sensor and wiring are good.

### Related guides on this vehicle

- [Engine Cranks But Won't Start No Fuel Pressure 2018 Toyota Rav4](/articles/engine-cranks-wont-start-no-fuel-pressure-toyota-rav4-2018)
- [Starter Solenoid Clicking But Engine Won't Crank 2020 Toyota Corolla](/articles/starter-solenoid-clicking-no-crank-toyota-corolla-2020)
- [2020 Toyota Corolla: Car Won't Start, No Fuel Pump Prime Sound](/articles/car-wont-start-no-fuel-pump-prime-toyota-corolla-2020)

## Step-by-step diagnosis and fixes

Addressing a crankshaft position sensor issue on your 2020 Toyota Camry typically follows these steps:

1.  **Scan for Trouble Codes**: As mentioned, start by using an OBD-II scanner to confirm the presence of P0335 or other related codes. This provides a strong starting point.
2.  **Inspect Wiring and Connector**: Visually examine the sensor's wiring harness and connector for any signs of damage, corrosion, or looseness. Repair any damaged wiring or clean corroded terminals.
3.  **Test Sensor (if accessible)**: If you have the necessary tools and expertise, test the sensor's output. For many magnetic sensors, you can check resistance; for Hall effect sensors, you might check voltage signals while cranking. Consult your Camry's service manual for specific values.
4.  **Replace the Crankshaft Position Sensor**: If testing confirms the sensor is faulty, or if visual inspection reveals damage, replacement is necessary. The location can vary, but on many 2020 Toyota Camry models, it's often located on the engine block, near the transmission bell housing, or behind the crankshaft pulley. Ensure the engine is cool before attempting this repair.
5.  **Clear Codes and Test Drive**: After replacing the sensor, clear any stored DTCs from the ECM. Start the vehicle and perform a test drive to ensure the issue is resolved and no new codes appear. Pay attention to starting behavior, idle quality, and acceleration.

## Repair options and cost factors

When facing a faulty crankshaft position sensor, you generally have two main repair options for your 2020 Toyota Camry:

-   **DIY Replacement**: If you have mechanical experience, the right tools, and a service manual, replacing the sensor yourself can save on labor costs. The cost will primarily be for the part itself. Aftermarket sensors can range from $30-$100, while OEM (Original Equipment Manufacturer) sensors typically cost $80-$200.
-   **Professional Replacement**: Taking your Camry to a qualified mechanic or Toyota dealership ensures the job is done correctly. Labor costs will be added to the part cost. Given the sensor's location, labor can range from 1 to 3 hours, depending on accessibility. Total costs can vary significantly based on your region and the shop's labor rates.

Factors affecting total cost include the type of sensor chosen (OEM vs. aftermarket), the complexity of accessing the sensor on your specific engine variant, and the labor rates of the repair shop. While aftermarket sensors can be cheaper, OEM parts often offer better reliability and compatibility.

## When to see a professional

While some drivers are comfortable tackling DIY repairs, there are specific situations where consulting a professional for your 2020 Toyota Camry's crankshaft position sensor issue is highly advisable:

-   **Difficulty in Diagnosis**: If you've performed basic checks and are still unsure of the root cause, a professional technician has advanced diagnostic tools (like oscilloscopes) and experience to pinpoint the exact problem.
-   **Lack of Specialized Tools**: Some diagnostic steps or sensor locations require specific tools that most home mechanics don't possess.
-   **Uncomfortable with Engine Work**: If you're not confident working with engine components, electrical systems, or accessing hard-to-reach parts, it's safer to let a professional handle it.
-   **Suspect More Complex Issues**: If the problem persists after sensor replacement, or if you suspect related issues with wiring harnesses, the ECM, or other engine components (like those related to [fuel trim and air metering](/hubs/fuel-trim-air-metering)), a professional can provide a comprehensive diagnosis. For more general repair advice, feel free to browse our collection of all repair guides.

## Frequently asked questions

### Can a bad crankshaft position sensor cause my 2020 Camry to stall while driving?

Yes, a failing crankshaft position sensor can absolutely cause your 2020 Toyota Camry to stall while driving. If the sensor's signal becomes erratic or completely drops out while the engine is running, the Engine Control Module (ECM) loses critical information about the crankshaft's position and speed, leading to an immediate loss of spark and fuel injection, causing the engine to shut down.

### Where is the crankshaft position sensor located on a 2020 Toyota Camry?

The exact location of the crankshaft position sensor on a 2020 Toyota Camry can vary slightly depending on the engine (e.g., 4-cylinder vs. V6). Generally, it is located on the engine block, often near the front of the engine close to the crankshaft pulley, or sometimes on the lower rear of the engine block near the transmission bell housing. Consulting your vehicle's service manual or an online parts diagram for your specific engine is the best way to pinpoint its precise location.

### Will my 2020 Camry start if the crankshaft position sensor is faulty?

In most cases, if the crankshaft position sensor is faulty on your 2020 Toyota Camry, the engine will crank but will not start. The ECM relies heavily on the sensor's signal to synchronize fuel injection and ignition timing. Without an accurate signal, the engine cannot achieve the precise timing needed for combustion, preventing it from firing up. In some intermittent failure scenarios, it might start after several attempts or when the engine is cold.

## Sources and further reading

-   All repair guides
-   [Browse vehicles](/vehicles)
-   [Related OBD-II code reference: P0335](/codes/P0335)
-   [Related topic hub: Fuel Trim & Air Metering](/hubs/fuel-trim-air-metering)

This information is for general guidance only and is not a substitute for OEM service procedures. Always consult a qualified technician for safety-critical work.

## Explore related guides on ClearTheCode

- [Browse OBD-II codes](/codes)
- All repair guides