P0321 OBD-II Trouble Code: Ignition/Distributor Engine Speed Input Circuit Range/Performance

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Cost of diagnosing the P0321 code

P0321 is a diagnostic trouble code (DTC) for "Ignition/Distributor Engine Speed Input Circuit Range/Performance". 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.

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P0321 code definition

Ignition/Distributor Engine Speed Input Circuit Range/Performance

What the P0321 code means

P0321 is an OBD-II generic code that the engine control module (ECM) detected the engine speed input sensor circuit out of range or its performance is not within specifications. The sensor may also be called a RPM sensor.

What causes the P0321 code?

  • The engine speed sensor open or shorted internally that would cause the engine to stall or not start.

  • The wiring or connection to the speed sensor is getting shorted or losing connection intermittently.

What are the symptoms of the P0321 code?

  • The Check Engine Light will be illuminated and the code is set in ECM memory.
  • The engine would stall or not start if failure is present.
  • The engine will have a misfire and may buck or jerk while driving for an intermittent connection.

How does a mechanic diagnose the P0321 code?

  • Scans codes and documents the freeze frame data in order to verify the problem.

  • Clears the engine and ETC codes and road tests to verify the concern comes back.

  • Visually checks the wiring and connections to the engine speed sensor for loose or damaged wiring connections.

  • Disconnects and checks the resistance and signal voltage from the engine speed sensor.

  • Checks for any corrosion in the sensor connections.

  • Checks the sensor reluctor wheel for breakage or damage.

Common mistakes when diagnosing the P0321 code

  • Failing to check the air gap of the engine speed sensor for intermittent failures or loss of signal.

  • Failure to repair oil leaks onto the sensor before replacing the sensor.

How serious is the P0321 code?

  • A failed engine speed sensor will cause the engine to stall or not run at all.

  • An intermittent engine speed signal from the sensor can cause the engine to run rough, stall, jerk, or misfire while driving.

What repairs can fix the P0321 code?

  • Replacing the faulty engine speed sensor.
  • Replacing a broken reluctor ring on the crankshaft or damper.
  • Repairing corroded connections to the engine speed sensor.

Additional comments for consideration regarding the P0321 code

Code P0321 is triggered when the engine speed sensor does not generate a signal to keep the engine running.

Need help with a P0321 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
P0321
Check Engine Light

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Kevin

24 years of experience
388 reviews
Kevin
24 years of experience
Chevrolet Tracker - Check Engine Light is on - Stone Mountain, Georgia
Kevin was pretty cool! He explained things to me in a way I could understand and was able to offer me some good options to fix my car problems! Very professional and knew his stuff! Excellent experience

JOHNNY

33 years of experience
63 reviews
JOHNNY
33 years of experience
Toyota Camry - Check Engine Light is on - Carmichael, California
Johnny was early, friendly, and thorough! He explained things to me about my car that I had no idea about before! I booked him for a diagnostic appointment and I’m definitely requesting him for a follow-up!

Benji

22 years of experience
184 reviews
Benji
22 years of experience
Jaguar XK - Check Engine Light is on - Phoenix, Arizona
Will absolutely recommend Benjie to all my friends, thorough and knowledgeable. Will have him back fit all future car repairs!

Marco

29 years of experience
124 reviews
Marco
29 years of experience
Kia Soul - Check Engine Light is on - Riverside, California
Marco was great. Cam on time, and explained everything he did. Also gave good recommendation for fixing as the problem has a Kia recall.


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