BMW P0322: Ignition or Distributor Engine Speed Input Circuit No Signal — Diagnosis and Repair

P0322 means Ignition or Distributor Engine Speed Input Circuit No Signal. The DME stores it when crankshaft engine-speed signal acquisition no longer matches the monitored operating state. Treat the record as a measured conclusion, then preserve cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history before clearing evidence or replacing a component. What Does P0322 Mean? P0322 is the standardized OBD-II definition for Ignition or Distributor Engine Speed Input Circuit No Signal. On a BMW, the decisive evidence comes from cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history. The code identifies the failed monitor, but it does not prove which individual wire, component, hydraulic path, or mechanical part caused that monitor to fail. BMW engines are distributorless, so P0322 points to a missing engine-speed input, usually crankshaft-position evidence. The key distinction is no recognized pulse, rather than a merely implausible speed range or a cam-correlation offset. Confirm the installed engine, transmission, module, and wiring through the VIN before choosing a test point. Freeze-frame order matters because a supporting code recorded earlier can reveal whether this record is primary or only a consequence. Code: P0322 Definition: Ignition or Distributor Engine Speed Input Circuit No Signal Module: DME Key data: cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history Typical cause: The crankshaft-position sensor connector is loose, oil contaminated, or has a withdrawn signal terminal. Severity: condition dependent Note: confirm architecture and test points by VIN BMW P0322 means DME sees no engine-speed pulse. Capture cranking rpm, crank waveform, synchronization, and hot-sensor dropout. What Are the Symptoms of P0322? The measurable symptoms of P0322 must follow the behavior of crankshaft engine-speed signal acquisition, not a generic warning-lamp list. Compare the stored transition with a stable reference condition and look for a trace that changes late, stays fixed, drops out, or disagrees with its commanded state. These observations narrow the fault before parts are disturbed. • Live engine speed remains at zero while the starter audibly turns the crankshaft at a steady rate. • The engine stalls abruptly and the rpm trace disappears before battery voltage or network communication changes. • Cam pulses remain visible during cranking while crank synchronization never becomes valid in the DME. • A hot no-start clears after cooling because an internally open crank sensor temporarily regains continuity. • Harness movement near the bellhousing removes the speed signal without altering starter sound or supply voltage. • Fuel and ignition commands remain inhibited because the controller cannot establish trustworthy crank position. Why Does P0322 Occur? Causes of P0322 should be checked from accessible evidence toward expensive internal work. Begin with fluid level, connector condition, routing, shared supply, and component response that actually belong to crankshaft engine-speed signal acquisition. Escalate only when loaded electrical tests and live-data behavior exclude those paths; an expensive assembly is not the first diagnostic assumption. • The crankshaft-position sensor connector is loose, oil contaminated, or has a withdrawn signal terminal. • Heat opens the crank sensor internally after the engine compartment reaches operating temperature. • Harness insulation chafes near the transmission housing and grounds the engine-speed signal conductor. • Sensor supply or ground is lost through a corroded splice shared with another engine input. • A damaged reluctor wheel prevents recognizable pulses despite a powered sensor and intact harness. • DME input failure is considered only after a correct crank waveform arrives without rpm recognition. How Is P0322 Diagnosed with OBDThink? OBDThink is an independent BMW coding and diagnostics app and is not affiliated with BMW AG. For P0322, preserve the event before testing the first physical path. • 1. Save cranking rpm, synchronization, cam status, sensor supply, battery voltage, temperature, and network faults. • 2. Confirm the VIN-specific crank sensor type, location, supply arrangement, and expected test method. • 3. Watch rpm during cranking while comparing starter sound and minimum battery voltage from the same attempt. • 4. Scope crank and cam together so missing crank pulses are separated from a general module reset. • 5. Inspect the bellhousing branch for oil saturation, heat damage, pinching, and connector-lock failure. • 6. Reproduce a hot failure safely and capture whether the crank waveform vanishes as temperature rises. • 7. Check reluctor evidence when dropout repeats at one mechanical position with stable power and ground. • 8. Test the DME input last after a clean dynamic signal is verified at the module connector. IF the commanded state changes AND the measured crankshaft engine-speed signal acquisition trace stays fixed, THEN test the component connector under load. ELSE IF the trace changes at the connector but not at the DME, THEN test the intervening harness. ELSE compare the physical response with cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history before authorizing an expensive repair. Use OBDThink to preserve the P0322 freeze frame and graph cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history; this guide converts the evidence into a safe test order. How Is P0322 Repaired? Repair P0322 only after one test isolates the failed path in crankshaft engine-speed signal acquisition. Restore terminals, seals, routing, fluid condition, or wiring before replacing a sensor, valve, actuator, module, or mechanical assembly. After the work, repeat the original operating condition and compare the same data channels rather than accepting a cleared code as proof. • Low cost: clean the sensor connector and restore its lock and terminal contact tension. • Low cost: secure the crank-sensor branch away from the bellhousing edge that damaged insulation. • Moderate cost: repair the signal, supply, or ground conductor while preserving required shielding. • Moderate cost: replace the crankshaft-position sensor after heat-dependent waveform loss is captured. • High cost: repair the reluctor wheel when repeatable missing pulses are mechanically confirmed. • High cost: service the DME only when a valid arriving waveform still produces no rpm. After repair, confirm that P0322 no longer occurs, the original transition is stable, and the relevant monitor completes. Can You Drive with P0322? Driving with P0322 depends on the failure described by Ignition or Distributor Engine Speed Input Circuit No Signal. Use the stored data and current behavior to decide whether a short, gentle trip is defensible. Do not rely on the warning lamp alone: loss of lubrication, stalling, severe slip, fuel vapor, or unstable control requires a more conservative response. For P0322, the trip decision follows crankshaft engine-speed signal acquisition evidence. Limit travel to diagnosis and stop if the recorded behavior, warning severity, odor, noise, or control response worsens. Do not drive after an rpm-signal stall or intermittent no-start; sudden engine shutdown can remove power assistance in traffic. Which Questions Are Frequently Asked? Questions about P0322 should begin with cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history. Preserve the first event and repeat its operating condition after repair to prove that the same deviation is gone. • Can P0322 clear by itself? P0322 identifies Ignition or Distributor Engine Speed Input Circuit No Signal. Diagnosis compares cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history so its electrical, control, and physical causes are separated before repair. • Should the named component be replaced first? No. Test its connector, supply, command, feedback, and physical response in the crankshaft engine-speed signal acquisition context before ordering a part. • How is the repair confirmed? Repeat the stored operating condition and verify that cranking rpm, crank and cam synchronization, crank waveform, sensor supply, battery voltage, and stall history remain coherent. Confirm that P0322 no longer occurs and that its monitor completes without a new companion fault. Use the evidence chain from the first stored event to choose the next measurement for P0322. Once the repaired crankshaft engine-speed signal acquisition response matches its command through the original transition, document the final scan and keep that trace as the baseline for future diagnosis.