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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 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.
Ignition/Distributor Engine Speed Input Circuit Range/Performance
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.
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.
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.
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.
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.
Code P0321 is triggered when the engine speed sensor does not generate a signal to keep the engine running.
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.