OBD-II reference

All 9.533 generic OBD-II codes, explained in detail.

Causes, inspection steps and sources — a comprehensive DIY archive. Created and maintained with love for the detail. Good luck and have fun!

Powertrain generic / SAE

P0616

Starter Relay A Circuit Low

The control line for starter relay A is shorted to ground - the ECU drives the relay and measures voltage too low.

SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 16

Possible causes

  • Control line shorted to ground high
  • Connector pins corroded - high contact resistance low
  • Harness chafing through insulation low

Symptoms

  • Check engine light on
  • Possible limp mode or no-start
  • Multiple follow-up faults across modules
  • Reset/relearn may be needed after repair

Inspection / repair

  • Difficulty: easy
  • DIY: possible
  • Estimated cost: 60–250 €
  • Estimated time: 0.3–1.2 h
  • Component: starter relay a
  • MIL / check engine light

Sources

References

How to read OBD-II codes

The first letter names the vehicle system, the second digit distinguishes generic from manufacturer-specific, the remaining digits group fault area and number.

PPowertrain: engine, transmission, emissions
BBody: chassis trim, comfort, interior
CChassis: suspension, brakes, steering
UNetwork: CAN, control modules, communication