P0108
Medium SeverityMAP/BARO Sensor Circuit High Input
Fuel System
P0108 — Instant Answer
MAP/BARO Sensor Circuit High Input
Severity: MEDIUM SEVERITY
Meaning: MAP sensor voltage is higher than maximum expected range. The ECM reads this as very low vacuum.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $20 - $80
Most common causes:
- 1. Faulty MAP sensor (35-45% of cases)
- 2. Open circuit in signal wire (10-25% of cases)
- 3. Large vacuum leak (10-25% of cases)
- 4. Damaged connector (10-25% of cases)
Symptoms
- ⚠️Rich running
- ⚠️Loss of power
- ⚠️Surging at idle
- ⚠️Black exhaust smoke
Common Causes
How to Diagnose P0108
- 1Check MAP sensor connector
- 2Measure sensor output voltage with KOEO
- 3Check signal wire for open circuit
- 4Replace sensor if stuck high
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0108 MAP/BARO Sensor Circuit High Input.
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Fuel Injectors
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Engine Oil
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0108.
OEM Manual Evidence
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Exact Vehicle Hubs
Browse →Open the exact vehicle hub grounded by OEM manual evidence related to P0108.
Open the exact vehicle hub grounded by OEM manual evidence related to P0108.
Open the exact vehicle hub grounded by OEM manual evidence related to P0108.
Related Codes
The MAP (Manifold Absolute Pressure) sensor is reading outside normal range. Affects fuel delivery and ignition timing calculations.
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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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29