What is an OBD2 code?

An OBD2 (On-Board Diagnostics) code is a diagnostic trouble code (DTC) generated by your vehicle's computer system when it detects a problem. These codes help identify specific issues with your vehicle's engine, transmission, emissions, or other systems.

How do I read OBD2 codes?

To read OBD2 codes, you'll need an OBD2 scanner. Plug it into your vehicle's OBD2 port (usually located under the dashboard), turn your key to the 'ON' position, and follow your scanner's instructions to retrieve the codes. Each code starts with a letter (P, B, C, or U) followed by four numbers.

What do the different types of OBD2 codes mean?

OBD2 codes are categorized by their first letter: P (Powertrain) for engine and transmission issues, B (Body) for interior systems like airbags, C (Chassis) for mechanical systems like brakes, and U (Network) for computer and module communication problems.

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Home » OBD2 Codes » P0337

Code P0337

Symptoms

• Engine may not start

• Engine misfires

• Check Engine Light is on

Common Causes

• Faulty crankshaft position sensor

• Damaged wiring or connectors

• ECM issues

Glossary

ECM: Engine Control Module

OBD-II: On-Board Diagnostics II

Related Codes

• P0335

• P0336

• P0338

Official description

Crankshaft Position Sensor A Circuit Low

Laymans terms

This means the car's computer is having trouble reading the position of a part called the crankshaft, which helps the engine run smoothly.

Explanation

The P0337 code indicates that the signal from the crankshaft position sensor is lower than expected by the engine control module (ECM).

Technical description

The crankshaft position sensor monitors the position and rotational speed of the crankshaft. This information is used by the ECM to control ignition timing and fuel injection. A 'Circuit Low' code means the sensor is sending a signal that is below the threshold set by the manufacturer, which can affect engine performance.

Diagnosis steps

• Use an OBD-II scanner to confirm the code.

• Inspect the crankshaft position sensor and its wiring for damage.

• Test the sensor's voltage and resistance.

Repair procedures

• Replace the crankshaft position sensor if faulty.

• Repair or replace damaged wiring or connectors.

• Reprogram or replace the ECM if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Socket set

Estimated repair cost

$100 - $300

Difficulty level

Moderate

Commonly affected vehicles

• Honda Accord

• Toyota Camry

• Ford F-150

Preventive measures

• Regularly inspect and maintain engine sensors.

• Keep electrical connections clean and secure.

• Follow manufacturer service schedules.

Error code type

Sensor Issue

User experience recommendations

• If the car doesn't start, check the sensor and wiring.

• Consult a professional mechanic if unsure about repairs.

Warranty information

Check vehicle warranty for coverage on engine sensors.

Historical data

This code has been common in vehicles with high mileage or poor maintenance.

Urgency level

High – Can lead to engine performance issues or failure to start.

Legal and safety notice

Driving with a faulty crankshaft position sensor can lead to unsafe driving conditions.

Testing conditions

• Engine off, key on

• Engine running

Component location

The crankshaft position sensor is typically located near the bottom of the engine, close to the crankshaft pulley.

FAQs

Q: Can I drive with a P0337 code?
A: It's not recommended, as it can lead to engine performance issues or failure to start.

Q: How do I clear a P0337 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it should not return.

Last updated: Mar 2, 2026 • Source: internal database

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