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 for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
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.

Check Engine Light
trouble codes
P0372

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

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P2552 OBD-II Trouble Code: Throttle/Fuel Inhibit Circuit
P2552 P2552 code definition A P2552 OBD-II trouble code indicates a problem with the throttle or fuel inhibitor circuit. This is a malfunction more commonly found in diesel-powered vehicles. This code is also associated with OBD-II trouble codes P2553, P2554,...
P0607 OBD-II Trouble Code: Control Module Performance
P0607 P0607 code definition The P0607 trouble code marks a performance problem with the control module. This code is often related to the P0602, P0603, P0604, P0605 (https://www.yourmechanic.com/article/p0605-obd-ii-trouble-code-p0605-internal-control-module-rom-error-module-identification-defined-by-sae-j1979-by-blake), and P0606 (https://www.yourmechanic.com/article/p0606-obd-ii-trouble-code-pcm-processor-fault-by-jamahl-walker) trouble codes. What the P0607 code means P0607 is...
P000A OBD-II Trouble Code: "A" Camshaft Position Slow Response Bank 1
P000A code definition This code is known as ‘A’ Camshaft Position Slow Response Bank 1. You may also see a 00010 fault...

Related questions

Gas tank door burnt black.
The most common cause for a P0440 code (https://www.yourmechanic.com/article/p0440-obd-ii-trouble-code-evaporative-emission-control-system-malfunction-by-jay-safford_2) is the fuel cap seal. I suggest making sure that the fuel cap is tight by turning until it clicks. If you are sure that your fuel cap was tight, replace...
Vehicle not accelerating as it should
Hello. Thankfully the Check Engine Light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) came on. These issues are easier to diagnose when the engine's computer has already detected what systems are showing issues. The first step is going to be to get the vehicle scanned for...
Distronic plus, parktronic inoperative, pre-safe limited, ECS off during driving.
Hello, thank you for writing in. There are two possibilities that are most likely at this point. Either the run-up caused the issue, or an underlying issue caused the need for a tune-up. The best place to start is to...

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