What is the P0019 fault code?
The P0019 fault code is a generic powertrain code indicating a correlation problem between the crankshaft position sensor (CKP) and the camshaft position sensor (CMP) on bank 2, sensor B. It signifies that the powertrain control module (PCM) has detected a misalignment between the signals from these two sensors beyond the specified tolerances.
Sensor Roles and Symptoms
The crankshaft sensor and camshaft sensor work together to control ignition and injection timing. A timing fault can cause:
- Malfunction Indicator Lamp (MIL) illumination
- Engine running with reduced performance
- Hard starting or failure to start
- Abnormal knocking noises
- Engine running poorly
Possible Causes of P0019 Fault
- Stretched or jumped timing chain or belt
- Timing misalignment
- Displaced or damaged crankshaft or camshaft reluctor ring
- Faulty crankshaft or camshaft sensor
- Damaged wiring to either sensor
- Faulty chain or belt tensioner
- Loose harmonic balancer or crankshaft bolt
- Issue with CMP actuator solenoid
- Engine timing or assembly error
Diagnosis and Solutions
If your vehicle is still under warranty, entrust diagnosis and repair to an authorized dealer.
For independent diagnosis:
- Visual Inspection: Check sensors, connectors, and wiring for any damage. Repair frayed or broken wires if necessary.
- Signal Verification: Using an oscilloscope, analyze CKP and CMP sensor signals. Missing or abnormal signals may indicate a faulty sensor or damaged reluctor ring.
- Mechanical Inspection: Check timing alignment. A jumped timing belt or chain is a common cause. Inspect the tensioner condition.
- Reluctor Ring Inspection: On some engines, it may be necessary to remove the harmonic balancer or camshaft sprocket to inspect reluctor rings and ensure proper alignment and fixation.
Important Tip: This code often appears with other codes like P0008, P0009, P0016, P0017, or P0018. On GM vehicles, consult Technical Service Bulletins (TSBs) for known issues.
Conclusion and Call to Action
The P0019 code indicates a serious engine timing problem. Prompt intervention is crucial to prevent potential engine damage.
Looking for vehicle-specific advice? Consult a specialized repair manual immediately or contact a professional for accurate diagnosis.