Skip the auto shop - Our mechanics make house calls

OBD-II Trouble Code P0371: Timing Reference High Resolution - Signal A - Too Many Pulses

diagnostic check engine light

P0371 code definition

The P0371 code is a generic powertrain code related to an ignition system error or misfire. In this case, the engine control module (ECM) has found a fault or malfunction with the high resolution timing reference signal A.

What the P0371 code means

A code P0371 will be stored when the ECM has detected a variation in the high resolution engine timing signal, in which a preset number of degrees was exceeded. The allowed degrees of variation will depend on your vehicle make and model, it is recommended to check your vehicle service manual for more information.

Typically, auto manufacturers use an electromagnetic crankshaft position sensor in two ways, both of which use either a reluctor ring or teeth to create a square waveform pattern that gives the ECM the crankshaft position. One manufacturer design will utilize the crankshaft position sensor for misfire detection, and the other uses the sensor for the calculation of spark timing and ignition control.

Signal A pertains to a specific area of system circuitry, it is recommended to check your vehicle service manual for specifics as to the location of signal A in your specific vehicle make and model.

What causes the P0371 code?

Several problems may cause a P0371 code including:

What are the symptoms of the P0371 code?

Symptoms of a P0371 code may include:

How does a mechanic diagnose the P0371 code?

A mechanic may use several methods to diagnose a P0371 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P0371 trouble code
  • Visually inspect electrical wiring and related connectors and components for signs of damage
  • When the engine is running, check for an engine rpm signal using a scanner or through looking at the tachometer.
  • Visually inspect the crankshaft gear, crankshaft position sensor, and sensor connector for any signs of damage of defect
  • Test the crankshaft position sensor system for reference voltage signal
  • Test camshaft position sensor
  • Utilize a oscilloscope to test the crankshaft position sensor for the proper waveform pattern
  • Test circuits for correct resistance and voltage

Common mistakes when diagnosing the P0371 code

While it’s possible that camshaft, crankshaft, and distributor sensors could be the problem, they are often immediately assumed to be the problem and replaced. It is recommended to check all electrical circuitry and wiring, and check for mechanical distributor malfunction, prior to replacing any sensors.

How serious is the P0371 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0371 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P0371 code?

Several repairs can fix a P0371 trouble code and include:

Additional information related to a P0371 code

If you need to replace the camshaft and/or crankshaft sensors, it is recommended to do so as a set and to utilize original equipment manufacturer (OEM) sensors. Also, if replacing sensors, be sure to check crank and cam reluctor rings for damage or need of replacement.

Need help with a P0371 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed Related Trouble Codes: P2441: EVAP Vent Valve Stuck Open EVAP trouble...


Related questions

Q: My car is a Nissan Navara. My Check Engine Light is on and my acceleration is not well.

Hi there. It seems that the engine you have is a diesel engine. The code P2002 is coming up for the particulate filter and it has an efficiency issue. The only thing to do with this is replace the particulate...

Q: OBD-II scanner read code P0108

Hello. The MAP sensor reading on a scanner should read about 1.0 to 1.5 volts at idle and 4.5 to 4.8 volts at wide open throttle. The MAP should read 4.8 volts or more when you have the key on...

Q: Engine came on and we took it to Autozone. Code read P0430

Hello. This issue can be caused by a failing catalytic converter or by a bad oxygen sensor. As for driving the vehicle, if it is not lacking any power then it should be fine to drive. The only time a...