The P1345 code on your 2023 Chevrolet Colorado indicates a problem with the variable valve timing (VVT) system on bank 1. This GM-specific code affects your Colorado's 2.7L turbocharged or 3.6L V6 engine's ability to optimize valve timing for performance and efficiency, potentially impacting power delivery and fuel economy.
Understanding P1345 on Colorado
The VVT system uses oil pressure-actuated cam phasers to adjust intake and exhaust valve timing based on engine speed and load. Bank 1 refers to the cylinder bank containing cylinder #1. Code P1345 indicates the PCM has detected a fault in the VVT solenoid circuit, cam phaser operation, or camshaft position correlation on bank 1.
Common Symptoms
- Check engine light on
- Engine rattle or knocking noise, especially at startup
- Rough idle
- Reduced power and acceleration
- Decreased fuel economy
- Possible stalling at idle
- Engine may run rough when cold
Primary Causes
- Faulty VVT solenoid on bank 1
- Worn or stuck cam phaser
- Low oil pressure or level
- Dirty or degraded engine oil
- Timing chain stretch affecting cam position
- Wiring issues to VVT solenoid
- Camshaft position sensor fault
Diagnostic Procedure for 2023 Colorado
Begin by checking engine oil level and condition - low or dirty oil is a common cause of VVT issues. Monitor actual camshaft position versus commanded position using a scan tool with live data capability. Test the VVT solenoid resistance and compare to specifications. Inspect VVT solenoid connector and wiring for damage. Listen for cam phaser rattle on cold startup which indicates worn components. Check oil pressure to verify adequate supply to VVT components.
Repair Solutions
If oil is low or dirty, perform an oil change with manufacturer-specified oil and observe if symptoms improve. Replace a faulty VVT solenoid - these are relatively inexpensive and commonly fail. Address wiring issues with proper repairs. If cam phasers are worn (indicated by persistent rattle and code return after solenoid replacement), phaser replacement is required. Timing chain replacement may be needed if stretch is detected.