P0371 OBD Error Code: Problem & Solutions

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OBD fault code P0371 is defined as “Timing Reference High Resolution Signal “A” – Too Many Pulses”. This code is related to ignition system or misfire. If the PCM detects variations in the high-resolution engine timing signal that exceed a predetermined number of degrees, a code will be stored. This code is considered as potentially serious code and should be resolved immediately to avoid any serious problem in near future.

The P0371 code is a generic powertrain code which indicates that the PCM has detected an abnormality in the high-resolution timing reference signal. The “A” pertains more to an area of the system circuitry than to a particular component. This code can be set either when the Crank Position Sensor fails or when something interferes with or changes the pattern and /or arrangement of the reluctor ring that works in conjunction with the sensor, thereby causing too many ignition/fuel injection pulses to be generated. The powertrain control module (PCM) sends a duplicate signal of the crankshaft position sensor to the Fuel Injection Control Module (FICM). If the signal to the FICM becomes corrupt, the PCM will set code P0371.

A code P0371 is set and service engine soon lamp may be illuminated when the PCM detects the engine position sensor "A" is producing a signal with too many pulses.

What causes this problem with the Timing Reference High Resolution - Signal A - Too Many Pulses?

• Sensor failure
• Wiring problem
• Reluctor rings damage
• Magnet problem
• Substandard oil

1. Engine Control Module - Engine control module basically controls the fuel mixture, ignition timing, variable cam timing and emissions control. It’s actually liked a brain of your vehicle which performs all the major functions. Make sure it should work properly else repair or replace as required.
2. Crankshaft Position Sensor - The crankshaft position sensor is a vital electronic device located in the engine of a car. Its purpose is to register the rate at which the crankshaft spins. Ensure its efficient functioning to avoid any related trouble code.
3. Camshaft Position Sensor - The camshaft sensor enables the engine control to determine the exact position of the crankshaft drive. Its smooth functioning is as important as the crankshaft sensor.
4. Distributor Cap - Distributor caps and rotors are responsible for passing the voltage from the ignition coils to the engine's cylinders in order to ignite the fuel-air mixture inside and power the engine. Replace them if found faulty.
5. Tachometer - Tachometer is an instrument which usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are increasingly common. It is a kind of diagnosing tool which you may require to diagnose this error code.

Below mentioned are the common symptoms for the OBD error code P0371. Get your vehicle diagnosed immediately if start facing any of these:

• Bad engine performance
• Fall in fuel economy
• Difficulty in starting engine
• Misfiring of engine
• Poor acceleration
• Illuminated engine check light

Error code P0371 is one of the potentially serious codes. When this code appears, it is recommended to immediately take your vehicle to your local service centre or mechanic for repair and diagnosis. The repairs and replacements that can help you fix this code are as follows:

• Repair damaged or defective electrical wiring and related components
• Replace damaged or defective crankshaft position sensor
• Replace damaged or defective camshaft position sensor
• Replace damaged or defective distributor sensor
• Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

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Check out the steps to diagnose this trouble code P0371. You may require some diagnosing tools as well to do so. Make sure you take all the precautions and follow the steps carefully. However, we always recommend you to take the help of an experienced diagnostician.

• Check for the stored trouble code with the help of OBD-II scanner.
• Verify if electrical wiring and related connectors and components are not damaged.
• Use scanner and tachometer to check for an engine rpm signal.
• Inspect the crankshaft gear, crankshaft position sensor, and sensor connector for any signs of damage.
• Check the crankshaft position sensor system for reference voltage signal.
• Test camshaft position sensor.
• Test circuits for correct resistance and voltage.

Common Mistakes When Diagnosing the P0371 Code

Before you replace the camshaft, crankshaft, and distributor sensors, always check them thoroughly, check out all electrical circuits and wiring, and check for mechanical distributor malfunction as they could be the main cause for the stored code.