2017 MG ZS: P0335 Crankshaft Position Sensor Circuit Fault – OEM Repair Guide

The P0335 fault code on a 2017 MG ZS indicates a problem within the crankshaft position sensor circuit. This sensor plays a critical role in engine management by providing crankshaft speed and position data to the ECU. When the signal is lost or becomes unreliable, the engine may experience starting difficulties, poor performance, or stalling.

Symptoms

  • Check Engine Light illuminated
  • Engine cranks but does not start
  • Intermittent no-start condition
  • Engine stalling while driving
  • Rough running or misfiring
  • Reduced engine performance
  • Tachometer may not function correctly
  • P0335 fault code stored in the ECU

Possible Causes

A P0335 fault can be caused by a failed crankshaft position sensor, damaged sensor wiring, connector corrosion, poor electrical connections, or a loss of power or ground within the circuit. In some cases, damage to the reluctor ring or signal interference from wiring faults can disrupt sensor operation. ECU-related issues are less common but should not be overlooked if all circuit checks pass.

Diagnosis

Diagnosis typically begins by confirming the P0335 fault code using a scan tool and checking for any related engine management faults. The crankshaft position sensor and its wiring should be visually inspected for signs of damage, contamination, or loose connections.

Technicians will commonly perform voltage, ground, continuity, and signal tests to verify sensor operation. Depending on the fault, oscilloscope testing may be required to evaluate the crankshaft position signal. The OEM repair manual is particularly valuable because it provides sensor specifications, wiring diagrams, connector pinouts, component locations, and manufacturer-approved testing procedures.

Recommended Resources

OEM Service and Repair Manual

The OEM Service and Repair Manual is the most reliable resource for diagnosing and repairing this fault. It typically includes:

  • Step-by-step diagnostic procedures
  • Wiring diagrams
  • Connector pinouts
  • Component locations
  • OEM troubleshooting workflows
  • Repair specifications and testing procedures

To order the correct OEM Service and Repair Manual for your 2017 MG ZS, submit your request using the form below and our team will provide the ordering details.