Error code

OBD2 P0029

OBD2P0029
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Exhaust Valve Control Solenoid Circuit Range/Performance.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0029 indicates an issue with the exhaust valve control solenoid circuit on bank 2 of the engine, which affects variable valve timing.

Symptoms

  • Illuminated check engine light
  • Rough idle
  • Reduced engine power at certain speeds
  • Increased fuel consumption

Common Causes

  • Low engine oil level or pressure
  • Incorrect or unsuitable lubricating oil
  • Open or short circuits in associated wiring
  • Corroded electrical connectors
  • Loss of ground contact
  • Defective actuators or control valves/mechanisms

Diagnosis

  1. Check and adjust engine oil level to correct mark.
  2. Perform an oil pressure test to ensure it is within specification.
  3. Inspect all related wiring and connectors for defects.
  4. Clean or replace actuators and control valves if necessary.
  5. Consider performing an engine flush if internal passages are blocked.

Fixes

  • Replace the exhaust valve control solenoid if it is defective.

FAQ

What should I do first when P0029 appears?

Start by checking and adjusting the engine oil level to ensure it's correct.

Can a bad PCM cause this code?

A defective PCM is rare but possible; all other causes should be ruled out first.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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