Crankshaft Position Sensor Output Circuit Low
The P2618 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the crankshaft position sensor output circuit. This sensor is critical for engine timing and fuel injection synchronization. A low signal can result from a faulty sensor, damaged wiring, poor electrical connections, or a failing ECM. This condition often leads to engine misfires, stalling, or no-start situations.
1. Most Common Causes
- Short to ground in the crankshaft position (CKP) sensor signal output circuit
- Open circuit or high resistance in the CKP sensor signal, reference, or ground wiring
- Faulty or internally damaged crankshaft position sensor
- Corroded, bent, loose, or moisture-contaminated CKP sensor connector
- Internal failure of the powertrain control module (PCM)
2. Symptoms You Will Notice
- Engine cranks but does not start
- Engine misfires or runs rough
- Intermittent stalling
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the crankshaft position sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and voltage output with a multimeter per manufacturer specs.
Step 4: Check for continuity and shorts in the wiring between sensor and ECM.
Step 5: If all else is normal, test the ECM for proper signal reception.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall unexpectedly or fail to start, posing a safety risk.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement, plus diagnostic fees if performed by a shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.