How is fault code P0337 fixed?

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull all the stored codes and write down what's there alongside the P0337. Companion codes like P0335 or P0339 point at the same circuit and help you build the picture 2. Get your hands on the sensor and its connector. Look for melted insulation, green corrosion on the pins, and oil in the plug. An oil-soaked connector is a frequent cause and a cheap fix 3. Check battery voltage and watch what it does on cranking. If it sags badly the sensor isn't getting a fair chance, sort the battery and starter before condemning anything else 4. Back-probe the connector and confirm you've got the reference voltage the manufacturer specs, usually around 5 volts. No reference, you've got a wiring or ECU problem upstream 5. Measure the sensor's resistance with a multimeter and hold it against the workshop figures. Way out of range and the sensor's scrap 6. If you've got a scope, watch the waveform while the engine cranks. A clean, repeating signal with proper peaks tells you the sensor and trigger whee

Crankshaft Position Sensor A Circuit Low Input

Jump to the fix

Severity

High

Can I keep driving?

Avoid extended driving; visit a service soon.

First step

A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training. 1. Pull all the stored codes and write down what's there alongside the P0337. Companion codes like P0335 or P0339 point at the same circuit and help you build the picture 2. Get your hands on the sensor and its connector. Look for melted insulation, green corrosion on the pins, and oil in the plug.

PPowertrain
0Generic code
3Ignition / Misfire
37Sequence number

What does it mean?

Three things are needed for the engine to run: air, fuel, and spark. To run well, the ECM (engine control module) precisely meters how much fuel to inject for the measured mass of air at any given moment, and then deliver a spark to ignite a power stroke, hundreds of times per second. Of course, this all requires precise timing, for which the ECM uses the camshaft and crankshaft position sensors (CMP and CKP). The crankshaft position signal serves two important functions.

First, it functions as a speed sensor, which the ECM uses to calculate engine speed in revolutions per minute (rpm). Second, CKP functions as a position sensor, which the ECU uses to calculate the position of cylinder #1 at top-dead-center (TDC). The ECU uses rpm and TDC measurements to calculate injector pulse width (IPW), ignition timing, and variable valve timing (VVT), among other things, and can even detect cylinder misfires.

If ECU cannot detect enough voltage coming from the CKP sensor, it sets DTC P0337 Crankshaft Position Sensor “A” Circuit Low Input.

Symptoms

Likely causes

How to fix it

Codes From the Same System

All Fault Codes

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This information follows the generic OBD-II definition and does not replace a vehicle-specific diagnosis. The severity rating is rule-based; an authorised diagnostic reading is required for a definitive answer.