Fault code P1345 – a step-by-step guide to diagnosing and fixing it

Error code P1345 is displayed and the check engine light is on - what does this mean?

The DTC P1345 is a manufacturer-specific fault code that is recognized by the OBD system if there is a problem with the camshaft-crankshaft correlation or the ignition control. This trouble code mainly occurs in General Motors vehicles and indicates a deviation in the synchronization between the camshaft and crankshaft.

What can cause this error code?

• Defective timing chain or timing belt
• Worn chain tensioners or guide rails
• Faulty camshaft or crankshaft sensors
• Damaged plug connections of the position sensors
• Defective camshaft phasing unit (VVT system)
• Mechanical damage to the valve train
• Incorrect assembly after repairs
• Worn camshaft gears
• Electronic problems in the engine control unit

What symptoms occur in parallel with error code P1345?

• Starting problems: The vehicle is difficult to start or does not start at all
• Engine running unsteadiness: rough idling and jerky engine running
• Loss of power: Significantly reduced engine power when driving
• Misfiring: Misfiring and irregular combustion
• Increased fuel consumption: Deteriorated engine efficiency
• Metallic noises: Rattling or rattling from the engine compartment
• Exhaust problems: Black or white smoke from the exhaust

How to fix the problem of fault code P1345?

• Repairing fault code P1345 requires a systematic diagnosis of the timing components.
• Check timing chain or timing belt and replace completely if worn: visual inspection for stretching, cracks or broken teeth, complete replacement including tensioner and guide rails if defective
• Test camshaft and crankshaft sensors and replace defective sensors: Resistance measurement and signal check of the position sensors, replacement of the affected sensors in the event of deviations
• Check and repair sensor plug connections and wiring harness: Check for corrosion, loose contacts or broken cables, clean or repair electrical connections
• Check camshaft phasing unit (VVT) and replace if defective: Function test of the variable valve timing system, replace the adjustment mechanism if there are problems
• Set the engine timing mechanically: Correct alignment of the timing marks on the camshaft and crankshaft according to the manufacturer's specifications
• Reprogram or replace the engine control unit: Software update or replacement of the ECU in the event of electronic defects