Engine Speed Sensor No Signal
The P0322 code indicates that the Engine Control Module (ECM) has detected no signal from the crankshaft position sensor or distributor pickup coil. This sensor is critical for determining engine speed and timing; without it, the ECM cannot properly control ignition timing or fuel injection. The issue may stem from a faulty sensor, damaged wiring, a defective distributor (if equipped), or a problem with the ECM itself.
01. Most Common Causes
- Faulty crankshaft position sensor
- Damaged or corroded wiring/connectors
- Defective distributor pickup coil (older vehicles)
- Failed ECM (rare)
02. Symptoms You Will Notice
- Engine cranks but won't start
- Engine stalls or runs poorly
- Check Engine Light illuminated
- No spark or fuel injector pulse
03. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0322 is present.
Step 2: Inspect the crankshaft position sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and AC voltage output while cranking (should be ~0.5-1.0V AC).
Step 4: Check for 5V reference and ground at sensor connector.
Step 5: If sensor tests OK, inspect distributor pickup coil (if applicable) and wiring to ECM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, the vehicle may stall or fail to start, posing a safety risk. It's best to have it towed to a repair shop.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement, plus diagnostic fees. Labor is usually 0.5-1 hour.