P0337
UniversalCrankshaft Position Sensor A Circuit Low Input
High SeverityThe P0337 code indicates that the vehicle's engine control module (ECM) is receiving an unusually low voltage signal from the Crankshaft Position Sensor 'A' circuit. This usually means the sensor is failing or there's a problem with its wiring, which can prevent the engine from starting or cause it to stall unexpectedly.
⚠️ Before You Begin (Safety First)
Always wear appropriate safety gear, including gloves and eye protection, when working on your vehicle. Ensure the engine is cool before touching components. For electrical work, always disconnect the battery's negative terminal to prevent accidental short circuits or electrical shocks.
Common Symptoms
- Check Engine Light illuminated
- Engine cranks but does not start
- Engine stalls unexpectedly while driving
- Rough idling
- Engine misfires
- Reduced engine power
Common Causes
- Faulty or failing Crankshaft Position Sensor
- Damaged or corroded wiring in the sensor circuit
- Poor electrical connection at the sensor or ECM
- Short circuit or open circuit in the sensor wiring
- Rarely, a faulty Engine Control Module (ECM)
Frequently reported on: Honda Civic 2001-2005, Toyota Camry 2002-2006, Ford F-150 2004-2008, Chevrolet Silverado 1999-2007, Nissan Altima 2002-2006
Diagnostic Steps
- Safely locate the Crankshaft Position Sensor (refer to your vehicle's service manual for exact location).
- Inspect the sensor's wiring harness and connector for any signs of damage, corrosion, or loose connections. Repair as needed.
- With the ignition off, disconnect the sensor and perform a resistance test or voltage test if specified by your vehicle's manual (requires a multimeter).
- If the sensor tests faulty or if visual inspection reveals damage, replace the sensor with a new, OEM-quality part.
- Clear the P0337 code using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.
👨🔧 When to Call a Professional
If you have replaced the Crankshaft Position Sensor and thoroughly inspected the wiring without resolving the P0337 code, or if your vehicle exhibits intermittent stalling and no-start conditions, it is best to consult a professional mechanic. Complex electrical diagnostics or potential ECM issues may require specialized tools and expertise.
Commonly Asked Questions
What does the P0337 code mean?
The P0337 code indicates a low voltage input from the Crankshaft Position Sensor 'A' circuit, meaning the engine's computer isn't receiving the correct signal from this critical sensor.
Can I drive my car with a P0337 code?
It is not recommended to drive with a P0337 code. The engine may stall unexpectedly or fail to start, potentially leaving you stranded or causing dangerous situations.
How can I test my Crankshaft Position Sensor?
You can test it using a multimeter to check for proper resistance or voltage readings, according to your vehicle's specific service manual. Wiring integrity should also be checked.
What are the most common causes of P0337?
The most common causes are a faulty Crankshaft Position Sensor itself, damaged wiring, or a poor electrical connection to the sensor.
Does replacing the Crankshaft Position Sensor always fix P0337?
While a faulty sensor is a primary cause, if the code persists after replacement, the issue might be with the wiring harness, connector, or, less commonly, the Engine Control Module (ECM).