P0372 OBD-II Trouble Code: Timing Reference High Resolution Signal A Too Few Pulses

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0372 code

P0372 is a diagnostic trouble code (DTC) for "Timing Reference High Resolution Signal A Too Few Pulses". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0372 DIAGNOSTIC Get a fair and transparent estimate upfront

P0372 code definition

P0372 is the OBD-II trouble code for Timing Reference High Resolution Signal A too few pulses.

What the P0372 code means

The Powertrain Control Module (PCM) provides control and timing for the fuel injection system in part by monitoring signals sent by the optical sensor. This sensor sends a high resolution signal to the PCM indicating how many pulses have been detected on the sensor disk on the injection pump.

There should be about 64 pulses for every cam pulse, and when the number actually detected deviates from this norm, the P0372 or another P0370 series code will store. The letter A simply indicates an area of the involved circuitry rather than a specific component.

What causes the P0372 code?

Conditions that may cause this Diagnostic Trouble Code (DTC) include:

  • A faulty camshaft or camshaft sensor

  • A faulty crankshaft or crankshaft sensor

  • Bad distributor position sensors

  • An open or short in the timing reference optical sensor harness

  • A faulty optical sensor

  • Loose or damaged connections in the timing reference optical sensor circuitry

  • Mechanical failure in the distributor (most common in rear-wheel drive, high mileage vehicles)

  • PCM failure (rare)

Sensor failure is typically the most common cause of this trouble code. Still, a thorough diagnostic investigation should be carried out, as car problems often have more than one cause.

What are the symptoms of the P0372 code?

There may be no detectable symptoms at all, or there may be engine misfires, spark knock during acceleration, or decreased fuel efficiency. While the code will likely store upon the first occurrence, it may take some time before the Check Engine light comes on, so it’s important to be aware of any noticeable signs of a problem.

How does a mechanic diagnose the P0372 code?

Diagnostic procedure for this code may include:

  • Verifying that the DTC is stored, and recording the freeze frame data using a scan tool

  • Clearing any stored codes and then road testing the vehicle to see if they return

  • Visually observing the tachometer with the engine running to see if there is an RPM signal

  • Visually inspecting the crankshaft position sensor, crankshaft gear, and connectors and wiring for damage

  • Testing the Crankshaft Position Sensor (CPS) system to ensure the reference voltage matches specifications

  • Using an ohmmeter to check for system continuity

  • If necessary, inspecting the distributor for damage, wobble, or too much end-play

Common mistakes when diagnosing the P0372 code

Sometimes the crankshaft, camshaft, and distributor sensors will be replaced unnecessarily when the problem actually lies in a distributor malfunction. Neglecting to test the crank and cam reluctor rings when replacing sensors is also a common oversight.

How serious is the P0372 code?

Any malfunction which interferes with proper fuel injection timing and engine function should be considered serious. Because of the specialized diagnostic and repair tools often required for this type of problem, it’s best to have a qualified technician look at the vehicle as soon as possible.

What repairs can fix the P0372 code?

Possible solutions for this DTC include:

Additional comments for consideration regarding the P0372 code

If you decide to tackle the diagnostic process yourself, be sure that you disconnect the wiring connectors from the PCM side before checking resistance values on the harness side. This will prevent damage to the PCM.

When replacing crankshaft or camshaft sensors, be sure to replace them as a set, rather than individually.

The cause of DTC P0372 can be complicated and time-consuming to track down and repair. The task may involve multiple repairs, as well as specialized tools and equipment. If you suspect this repair is beyond your skill level, it’s best to contact a qualified mechanic and have them assess the issue instead.

Need help with a P0372 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.

trouble codes
P0372
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0372 code.

SCHEDULE P0372 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,606

Rating Summary
5,180
205
50
34
137
5,180
205
50
34
137

James

40 years of experience
34 reviews
James
40 years of experience
Ford F-150 - Check Engine Light is on - Chagrin Falls, Ohio
Jim was great! Arrived on time, quickly diagnosed the problem and recommended further work. Very helpful, I’ll use Jim again and recommend to family and friends.

Roberto

11 years of experience
137 reviews
Roberto
11 years of experience
Nissan Titan - Check Engine Light is on - Spring, Texas
Roberto was very thorough with his explanation of repairs needed. I will contact your mechanic for future repairs.

Matthew

32 years of experience
839 reviews
Matthew
32 years of experience
Kia Optima - Check Engine Light is on - Yorktown, Virginia
Matthew Lerman was God Sent, and thank God for Your Mechanic,, you have my Vote Looking , Looking forward for more Business. Very Honest Guy

Robert

20 years of experience
38 reviews
Robert
20 years of experience
Honda Accord - Check Engine Light is on - Brentwood, California
He came earlier than on time and got the job done faster than I seen anyone else have . Solid honest hard working dude.


More related articles

P0105 OBD-II Trouble Code: Manifold Air Pressure (MAP) Barometric Pressure Sensor Electrical Circuit Problem
P0105 P0105 Trouble code definition Manifold Air Pressure (MAP) Barometric Pressure Sensor Electrical Circuit Problem What the P0105 code means P0105 is the general code for a problem with the MAP circuit having an electrical failure or malfunction. The MAP...
B1962 OBD-II Trouble Code: Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Failure
B1962 means there is an error with a power seat potentiometer circuit, likely due to a defective potentiometer or damaged electrical components.
P0247 OBD-II Trouble Code: Turbocharger Wastegate Solenoid B Malfunction
P0247 P0247 code definition The P0247 code indicates that there is a turbocharger wastegate solenoid B malfunction. What the P0247 code means When the P0247 code appears on your vehicle, it means that the powertrain control module has found readings...

Related questions

P0191 code coming on - I already changed the fuel pump, fuel pressure sensor, and driver fuel module

Hi there. Check the fuel pressure on the rail with the engine off and the key on, with the engine running at idle, and the engine running at 2000 rpm. If the fuel pressure is greater than 35 psi, then...

Check engine and cruise control lights come on simultaneously

Hello. When the Check Engine Light comes on, it disables the cruise control. I would need to know the code to be able to tell what may be going on. I typically start by scanning the computer for codes to...

Car will not turn over - 2011 GMC Acadia

A flashing Check Engine Light is commonly an indicator that you have non-burning raw fuel that is flowing into the exhaust system or triggering the O2 sensors to report this information. This is one reason why your engine is probably...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com