P0322
UniversalIgnition/Distributor Engine Speed Input Circuit No Signal
High SeverityThis code indicates that the Powertrain Control Module (PCM) is not receiving a signal from the engine speed input circuit. This means the engine's computer cannot determine how fast the engine is turning, which will prevent the engine from starting or cause it to stall immediately, leading to a complete loss of vehicle operation.
⚠️ Before You Begin (Safety First)
Always allow the engine to cool before working on it to prevent burns. Disconnect the battery before performing any electrical work to avoid accidental shorts or shocks. Use proper jack stands if lifting the vehicle.
Common Symptoms
- Engine cranks but won't start
- Engine stalls immediately after starting
- Engine misfires or runs rough
- Loss of engine power
- Check Engine Light illuminated
- No tachometer reading
Common Causes
- Faulty Crankshaft Position Sensor (CKP) or Camshaft Position Sensor (CMP)
- Damaged or corroded wiring harness or connectors to the sensor
- Open or short circuit in the sensor's wiring
- Faulty ignition coil or distributor (if applicable) not sending a signal
- Loose or damaged sensor mounting
- Internal Engine Control Module (ECM) failure (less common)
Frequently reported on: General/Universal
Diagnostic Steps
- Visually inspect the Crankshaft Position Sensor and Camshaft Position Sensor wiring and connectors for any signs of damage, corrosion, or looseness.
- Ensure the sensor is securely mounted and free from debris.
- If accessible, test the sensor's resistance or signal output using a multimeter or oscilloscope according to service manual specifications.
- Repair or replace any damaged wiring or connectors.
- If the sensor is suspected to be faulty, replace the appropriate engine speed sensor.
- Clear the diagnostic trouble code with an OBD-II scanner and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If you have checked the basic wiring connections and replaced the primary engine speed sensor (such as the Crankshaft Position Sensor) and the code persists, it's time to consult a professional. Advanced diagnostics may be needed to pinpoint issues with the wiring harness, connectors, or the Engine Control Module (ECM) itself.
Commonly Asked Questions
What does the P0322 code specifically indicate?
P0322 means the engine's computer isn't getting a signal from the primary engine speed input circuit. This signal is crucial for the computer to know how fast the engine is rotating, which affects fuel injection and ignition timing.
Is it safe to drive my car with a P0322 code?
No, it is generally not safe or even possible to drive with a P0322 code. The engine will likely not start, or if it does, it will stall immediately or run extremely poorly. Driving could lead to unsafe conditions or further damage.
What are the most common parts that fail with a P0322 code?
The most common culprits are a faulty Crankshaft Position Sensor (CKP), a faulty Camshaft Position Sensor (CMP), or issues with the wiring harness and connectors leading to these sensors.
How can I diagnose a P0322 code at home?
Start by visually inspecting the wiring and connectors for the Crankshaft Position Sensor and Camshaft Position Sensor for damage or corrosion. You can also test the sensor's resistance with a multimeter if you have the vehicle's service manual for specifications.
Could a P0322 code be caused by something other than a sensor or wiring?
While less common, P0322 can also be caused by a fault in the ignition system (like a distributor) or, in rare cases, an internal issue with the Engine Control Module (ECM) itself. However, focus on the sensors and wiring first.