Error code

OBD2 P0049

OBD2P0049
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Turbo/Super Charger Turbine Overspeed.

Severity

moderateCan drive, but performance issues may occur.

Summary

P0049 indicates that the turbocharger or supercharger turbine is spinning too fast, as detected by the turbocharger speed sensor. This issue affects vehicles with forced induction systems.

Symptoms

  • Lack of engine power
  • Engine de-rates ('limp mode')
  • Reduced fuel mileage

Common Causes

  • Faulty turbo speed sensor
  • Damaged or chafed wires on the turbo speed sensor
  • Wiring harness damage near the exhaust manifold
  • Corroded or loose connections
  • Bad ground(s)
  • Aftermarket installed accessories interfering with the system
  • Low system voltage
  • Defective PCM

Diagnosis

  1. Check for other boost pressure codes and diagnose them first.
  2. Locate the turbocharger speed sensor and visually inspect it.
  3. Measure resistance between pins of the sensor to rule out faulty sensor.
  4. Inspect the wiring harness near the exhaust manifold for damage.
  5. Test circuits using a multimeter for shorts or opens.
  6. Consider bringing vehicle to repair facility if unsure about further diagnosis.

Fixes

  • Replace the faulty turbo speed sensor (if necessary).

FAQ

What should I do if my car enters 'limp mode'?

If your vehicle enters limp mode, it's best to address the underlying issue such as replacing a faulty sensor or repairing damaged wiring.

Can I drive with P0049 code active?

You can drive but expect reduced performance and fuel efficiency. It is recommended to get it fixed soon.

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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