Ignition/Distributor Engine Speed Input Circuit Range/Performance
Your engine's computer isn't receiving a reliable signal from the crankshaft position sensor, which is like the engine's heartbeat monitor. Without this signal, the engine can't time the ignition spark correctly.
The ECM monitors crankshaft position sensor (CKP) signals to measure engine speed and determine ignition timing. It expects clean, consistent pulses within a specific frequency range. When signals fall outside normal parameters—too weak, missing, or erratic—the ECM detects a range/performance issue.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CKP Signal Frequency | Proportional to RPM, steady pulses | Unstable, missing, or out-of-range pulses |
| Signal Voltage Amplitude | 0.3–5V (varies by sensor type) | Below 0.2V or erratic variations |
Code P0322 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0322 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.