P0108

Medium Severity

MAP/BARO Sensor Circuit High Input

Fuel System

What Does P0108 Mean?

MAP sensor voltage is higher than maximum expected range. The ECM reads this as very low vacuum.

Common Fix

Replace MAP sensor

Estimated Cost (DIY)

$20 - $80

Symptoms

  • ⚠️Rich running
  • ⚠️Loss of power
  • ⚠️Surging at idle
  • ⚠️Black exhaust smoke

Common Causes

Faulty MAP sensorlikely
Open circuit in signal wirepossible
Large vacuum leakpossible
Damaged connectorpossible

How to Diagnose P0108

  1. 1Check MAP sensor connector
  2. 2Measure sensor output voltage with KOEO
  3. 3Check signal wire for open circuit
  4. 4Replace sensor if stuck high

OEM Diagnostic Flowchart

Scroll to load technician if/then branches.

Read live data and freeze frame for P0108 to pinpoint the cause before buying parts.

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Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0108.

OEM Manual Evidence

Browse →
2013 GMC Truck Yukon XL Denali AWD V8-6.2L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...

2013 GMC Truck Yukon XL Denali 2WD V8-6.2L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...

2013 GMC Truck Yukon XL 4WD V8-6.0L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...

2013 GMC Truck Yukon XL 4WD V8-5.3L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...

Exact Vehicle Hubs

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2013 Gmc Truck Yukon Xl 4wd V8 5.3l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0108.

2013 Gmc Truck Yukon Xl 4wd V8 6.0l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0108.

2013 Gmc Truck Yukon Xl Denali 2wd V8 6.2l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0108.

2013 Gmc Truck Yukon Xl Denali Awd V8 6.2l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0108.

Related Codes

P0106: MAP/BARO Sensor Circuit Range/PerformanceRelated

The MAP (Manifold Absolute Pressure) sensor is reading outside normal range. Affects fuel delivery and ignition timing calculations.

P0107: MAP/BARO Sensor Circuit Low InputRelated

MAP sensor voltage is below the expected minimum. The ECM sees this as extremely high vacuum, causing incorrect fuel calculations.

Frequently Asked Questions

Can a vacuum leak cause P0108?
Yes, a large vacuum leak can cause MAP readings to stay high (near atmospheric pressure), triggering P0108.
How do I test a MAP sensor?
With ignition on, MAP sensor should read about 4.5V at atmospheric pressure and drop to 1-2V at idle vacuum.

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