A P0014 – Camshaft Timing Over-Advanced Fault on the 2018 MG ZS indicates that the Engine Control Module (ECM) has detected that the exhaust camshaft timing on Bank 1 is more advanced than the commanded position or that the Variable Valve Timing (VVT) system is not operating within the manufacturer’s specified parameters.

The ECM continuously compares the commanded camshaft angle with the actual camshaft position using signals from the Camshaft Position (CMP) Sensor and Crankshaft Position (CKP) Sensor to optimise engine performance, fuel economy, and emissions.

When the exhaust camshaft remains excessively advanced or fails to respond correctly to ECM commands, Diagnostic Trouble Code P0014 is stored and the Check Engine Light is illuminated. Common causes include contaminated engine oil, low oil pressure, faulty VVT components, timing chain wear, camshaft phaser faults, or mechanical timing errors.

Symptoms

• Check Engine Light illuminated
• Diagnostic Trouble Code (DTC) P0014 stored
• Rough engine idle
• Poor engine performance
• Reduced engine power
• Engine hesitation during acceleration
• Poor fuel economy
• Hard starting
• Engine stalling in some cases
• Additional Variable Valve Timing or camshaft-related Diagnostic Trouble Codes may also be present

Possible Causes

The fault may be caused by low engine oil level, contaminated or incorrect engine oil viscosity, low engine oil pressure, blocked oil passages supplying the Variable Valve Timing system, faulty VVT oil control solenoid, sticking or seized exhaust camshaft phaser, stretched timing chain, worn timing chain guides, faulty camshaft position sensor, crankshaft position sensor faults, damaged reluctor wheel, damaged wiring harnesses, loose or corroded electrical connectors, poor ground connections, Engine Control Module (ECM) faults, or CAN Bus communication issues affecting engine management. Oil quality and proper VVT operation are among the most common contributors to DTC P0014.

Diagnosis

Diagnosis begins by connecting a professional diagnostic scan tool to retrieve DTC P0014 together with any related Variable Valve Timing, camshaft position, crankshaft position, or engine oil pressure Diagnostic Trouble Codes. Freeze-frame data and live data should be analysed to compare commanded versus actual exhaust camshaft position, monitor Variable Valve Timing operation, engine speed, engine oil temperature, oil pressure (where supported), and camshaft position sensor signals. Any related Diagnostic Trouble Codes should be diagnosed first, as they frequently identify the system responsible for the timing fault.

A P0014 fault is not always caused by a defective camshaft position sensor. Technicians typically verify the engine oil level, oil condition, and oil viscosity before inspecting the Variable Valve Timing system. The VVT oil control solenoid should be tested for correct operation, while the timing chain, timing chain tensioner, camshaft phaser, crankshaft timing alignment, wiring harnesses, electrical connectors, battery voltage, and engine ground circuits should also be inspected. Where necessary, an oscilloscope may be used to compare crankshaft and camshaft position signals, and the manufacturer’s mechanical timing procedures should be followed to verify correct valve timing.

If the Variable Valve Timing system and mechanical timing components operate within specification, further diagnosis should include evaluation of the Engine Control Module, oil pressure control system, camshaft actuator circuits, and the CAN Bus communication network. Access to OEM wiring diagrams, connector pinouts, mechanical timing procedures, VVT diagnostic routines, component locations, circuit descriptions, and manufacturer diagnostic flowcharts is essential for accurate fault isolation. Following the OEM troubleshooting workflow helps identify the underlying cause efficiently while avoiding unnecessary replacement of sensors, oil control solenoids, timing components, or electronic control modules.

Recommended Resources

OEM Service and Repair Manual

The OEM Service and Repair Manual is the most reliable resource for diagnosing and repairing a P0014 Camshaft Timing Over-Advanced Fault. It typically includes:

• Diagnostic procedures specific to DTC P0014
• Engine management wiring diagrams and circuit descriptions
• Variable Valve Timing (VVT) system diagnostics
• Exhaust camshaft phaser inspection procedures
• Timing chain inspection and alignment procedures
• VVT oil control solenoid testing procedures
• Engine oil pressure testing procedures
• Crankshaft and camshaft position sensor diagnostics
• Connector pinout information
• Component locations and removal procedures
• OEM troubleshooting workflows
• Repair specifications and electrical testing procedures

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