Error code

OBD2 P0108

OBD2P0108
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Manifold Absolute Pressure/Barometric Pressure Circuit High Input.

Severity

moderateThe vehicle can be driven, but performance issues may occur.

Summary

P0108 indicates that the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor is providing an abnormally high input signal to the Powertrain Control Module (PCM). This issue can affect engine performance and fuel efficiency.

Symptoms

  • Illuminated CHECK ENGINE light
  • Increased fuel consumption
  • Decreased engine power and performance
  • Hard starting
  • Hesitation upon acceleration
  • Unpredictable engine stalling
  • Rough idling

Common Causes

  • Defective MAP sensor or BARO sensor
  • Short circuit in the wiring harness
  • High voltage from the alternator
  • Clogged air filter or vacuum hoses
  • Faulty throttle position sensor
  • Damaged catalytic converter
  • Open circuits or damaged wiring and connectors

Diagnosis

  1. Check for other trouble codes and address them first.
  2. Inspect the air filter, vacuum hoses, and catalytic converter.
  3. Examine wiring and connectors for damage or corrosion.
  4. Perform ground, continuity, and reference voltage checks on sensor wiring.
  5. Test the MAP/MAF sensor according to manufacturer specifications.

Fixes

  • Replace the faulty MAP or BARO sensor

FAQ

What causes P0108?

Common causes include a defective MAP or BARO sensor, wiring issues, high voltage from the alternator, and other engine-related problems.

How do I diagnose P0108?

Diagnose by checking for other codes, inspecting vacuum system components, examining wiring, performing electrical tests on sensors, and testing the MAP/MAF sensor.

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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