P1017 - Coolant Temperature Sensor Circuit Low Input
- Faulty coolant temperature sensor
- Coolant temperature sensor wiring harness is open or shorted
- Poor electrical connection to the coolant temperature sensor
- Faulty ECM (engine control module)
P1021 - Exhaust Cam Sensor Circuit Low Input
- Faulty exhaust camshaft position sensor
- Exhaust camshaft position sensor wiring harness is open or shorted
- Poor electrical connection to the exhaust camshaft position sensor
- Faulty ECM (engine control module)
P1026 - Intake Camshaft Position Sensor Circuit Range/Performance
- Faulty intake camshaft position sensor
- Intake camshaft position sensor wiring harness is open or shorted
- Poor electrical connection to the intake camshaft position sensor
- Faulty ECM (engine control module)
P1031 - Crankshaft Position Sensor Circuit Range/Performance
- Faulty crankshaft position sensor
- Crankshaft position sensor wiring harness is open or shorted
- Poor electrical connection to the crankshaft position sensor
- Faulty ECM (engine control module)
It's important to note that these are just possible causes, and the actual issue could be different. If you are experiencing these diagnostic codes, it's best to have a qualified mechanic inspect and diagnose the issue to determine the best course of action.
