P0108 on Honda
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0108 on Honda vehicles indicates manifold absolute pressure/barometric pressure circuit high input. Au7o has documented this code across 1 Honda model — most commonly on Civic. The PCM detects an abnormally high voltage signal from the MAP/BARO sensor circuit, above the expected range for the engine's operating condition. It often means the sensor reports high manifold pressure when the PCM expects low pressure (such as at idle). Symptoms include reduced fuel economy, poor performance, rough running, and an illuminated check engine light. Typical repair costs on Honda range from $40 to $180, depending on the specific model and root cause.
Common Causes of P0108
- •Faulty MAP/BARO sensor
- •Short to voltage in the MAP signal circuit
- •Disconnected or leaking vacuum supply to the sensor
- •Wiring or connector damage at the sensor
- •Restricted exhaust or clogged catalytic converter raising manifold pressure
- •Failed PCM (rare)
P0108 on Honda by Model
Honda Civic(1 issue)
- MAP Sensor Failure (1.6L D-Series)1996-1999
The manifold absolute pressure (MAP) sensor mounted on the throttle body of 1.6L D16 Civics commonly fails as it ages, losing the ability to hold vacuum or drifting out of its 0.5-4.5V calibration range. Because the PCM uses MAP voltage as the primary load input on these speed-density systems, a failing sensor causes the ECU to mis-fuel and mis-time the engine. Failures often set P0107 / P0108 / P1128 / P1129 codes and frequently coincide with cracked vacuum hoses on the upper intake.
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View P0108 across all makes →Frequently Asked Questions
What does P0108 mean on Honda?▼
P0108 stands for "Manifold Absolute Pressure/Barometric Pressure Circuit High Input." The PCM detects an abnormally high voltage signal from the MAP/BARO sensor circuit, above the expected range for the engine's operating condition. It often means the sensor reports high manifold pressure when the PCM expects low pressure (such as at idle). Symptoms include reduced fuel economy, poor performance, rough running, and an illuminated check engine light. On Honda specifically, this code is documented across 1 model.
What causes P0108 on Honda vehicles?▼
Common causes on Honda: Faulty MAP/BARO sensor, Short to voltage in the MAP signal circuit, Disconnected or leaking vacuum supply to the sensor, Wiring or connector damage at the sensor, Restricted exhaust or clogged catalytic converter raising manifold pressure. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0108 on a Honda?▼
Repair costs on Honda range from $40 to $180, depending on the specific model and root cause.
Which Honda models have P0108 documented?▼
Au7o has documented P0108 on 1 Honda model: Civic.