P0375 OBD-II Trouble Code: Timing Reference High Resolution Signal B Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0375 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0375 code

P0375 is a diagnostic trouble code (DTC) for "Timing Reference High Resolution Signal B Malfunction". 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0375 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light

P0375 code definition

If a PCM stores the P0375 code, it means it has detected a problem with the high resolution timing reference signal. “Signal B” is a reference to the location of the system circuitry and not a particular component.

What the P0375 code means

Your vehicle was made with an optical sensor that is responsible for providing high resolution signals to the PCM (Powertrain Control Module). Specifically, it does this by counting pulses on the vehicle’s sensor disk, installed in the injection pump.

These high resolution inputs are one of the most important the PCM receives as it directly affects the module’s ability to fuel timing and control. For every pump cam pulse, the number of pulses detected is counted and compared to how many should have occurred. If the number counted is abnormal, then the PCM will store the P0375 trouble code.

What causes the P0375 code?

The majority of the time, the P0375 code is stored because of one of the following common causes:

  • A faulty camshaft
  • A defective crankshaft
  • Faulty distributor position sensors

This last reason is especially likely if your vehicle is rear-wheel drive and high in mileage. Other reasons that could be responsible involve the vehicle’s wiring. Damaged, corroded or otherwise faulty wiring and/or connectors could also trigger the code.

Although it’s happened, PCM failure is very unlikely and an extremely rare reason for P0375 to be stored.

What are the symptoms of the P0375 code?

Unfortunately, one of the biggest challenges with the P0375 code is that although it can have potentially serious symptoms, it can also be very difficult to detect until it’s too late and you’re facing expensive repairs. Furthermore, the Check Engine Light may not even come on until at least a few failure cycles occur (this differs by model).

More serious symptoms are things like engines misfiring or spark knocking. This last symptom occurs when your fuel simply detonates at random times. Aside from the noise you’ll hear, it also means that your fuel efficiency is seriously suffering.

Even if spark knocks don’t occur, poor fuel efficiency is another sign that your vehicle may be suffering from issues related to P0375.

How does a mechanic diagnose the P0375 code?

A qualified mechanic will use a scanner to grab the code from your vehicle’s PCM. They will probably also use a tachometer to see what happens when your vehicle is cranked.

If they do this and no RPM signal is registered, the mechanic will then inspect the vehicle’s crankshaft position sensor, crankshaft gear, and sensor connector for any indication that damage has occurred which would lead to code P0375. Wires and other electrical components will be examined for the same reason.

If those steps fail to satisfactorily diagnose the problem, they’ll use an oscilloscope to test the CPS signal wire of your vehicle for adequate waveforms during every engine resolution.

Common mistakes when diagnosing the P0375 code

When mechanical distributor failure is responsible for causing P0375, a fairly common mistake during the diagnosis process is immediately blaming the camshaft, distributor sensors or crankshaft. As a result, they sometimes get replaced for no reason.

How serious is the P0375 code?

Given how severe some of the worst symptoms of problems connected to P0375 can be, this is one you’ll want to get checked by a professional mechanic right away. Although it’s not life-threatening, you’d hate for this problem to progress into something that could become dangerous.

What repairs can fix the P0375 code?

Your mechanic may do any of the following to clear P0375:

Additional comments for consideration regarding the P0375 code

Need help with a P0375 code?

If your vehicle isn’t working correctly because of issues connected to the P0375 code, YourMechanic is here to help. Just fill out our online form to set an appointment or receive a free quote. You can also call us at 1-800-701-6230 to speak with one of our service advisors.

P0375
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0375 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,788

Rating Summary
3,460
163
43
24
98
3,460
163
43
24
98

Alex

13 years of experience
405 reviews
Alex
13 years of experience
Alex was very thorough figuring out what was wrong with my car. He was extremely knowledgeable and made me feel very confident that my car would be fixed properly based on his diagnosis.
2002 FORD CROWN VICTORIA - CHECK ENGINE LIGHT IS ON - DALLAS, TEXAS

Travis

10 years of experience
105 reviews
Travis
10 years of experience
He was great ! Seemed to know exactly what he was talking about
2007 HYUNDAI SONATA - CHECK ENGINE LIGHT IS ON INSPECTION - MINNEAPOLIS, MINNESOTA

Damian

12 years of experience
6 reviews
Damian
12 years of experience
Completely satisfied, no complaints!
2002 KIA SEDONA - CHECK ENGINE LIGHT IS ON - PHILADELPHIA, PENNSYLVANIA

Michael

13 years of experience
403 reviews
Michael
13 years of experience

2009 NISSAN ALTIMA - CHECK ENGINE LIGHT IS ON - ALPHARETTA, GEORGIA

More related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Fuel Filler Neck Last?
Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....

Related questions

Q: when driving speed slow down and resume to speed it begins to jerk i have to put in over drive to resume speed especially on hiway

You should have the vehicle scanned. The data from the speed sensor needs to be checked to see if the transmission or engine is the cause of the jerking. You may have a transmission solenoid that's not shifting correctly, an...

Q: Check Engine Light with code P0740

There are a number of symptoms that may accompany a P0740 code, it may be that your car will stall at stop lights, or have trouble shifting, or you may not notice anything at all except your gas mileage is...

Q: Multiple trouble codes, no spark, no start.

You are getting codes to each and every major sensor on the engine that is needed to run your motor. You either have a major malfunction with the ECU or a problem with the harness not being wired correctly. You...

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.

1-800-701-6230 · hi@yourmechanic.com