P1108 Buick Code - BARO To MAP Sensor Circuit Comparison Too High
Quick Answer
The Manifold Absolute Pressure (MAP) sensor responds to pressure changes in the intake manifold. Common causes include Faulty Manifold Absolute Pressure (MAP) sensor, Manifold Absolute Pressure (MAP) sensor harness is open or shorted, Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1108 Buick indicates BARO To MAP Sensor Circuit Comparison Too High.
- Common causes
- Common causes include Faulty Manifold Absolute Pressure (MAP) sensor, Manifold Absolute Pressure (MAP) sensor harness is open or shorted, Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1108 Buick Description
- 5-volt reference circuit
- Low reference circuit
- MAP sensor signal circuit
The Powertrain Control Module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a wide open throttle (WOT). The MAP sensor is also used in order to determine the barometric pressure (BARO). This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range.
What are the Possible Causes of the DTC P1108 Buick?
- Faulty Manifold Absolute Pressure (MAP) sensor
- Manifold Absolute Pressure (MAP) sensor harness is open or shorted
- Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection
How to Fix the DTC P1108 Buick?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1108 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P1108 Buick Code
1. What are the common symptoms of OBDII code P1108 in a Buick?
- Common symptoms include rough idling, engine misfires, a decrease in fuel efficiency, and the Check Engine Light being illuminated.
2. What does the OBDII code P1108 Buick, "BARO to MAP Sensor Circuit Comparison Too High," indicate?
- This code indicates that there is a high voltage signal detected in the comparison between the Barometric Pressure (BARO) sensor and the Manifold Absolute Pressure (MAP) sensor.
3. What are the possible causes of the P1108 code in a Buick?
- Possible causes include a faulty MAP sensor, a faulty BARO sensor, wiring issues, vacuum leaks, or a problem with the engine's computer.
4. How can I diagnose the P1108 code in my Buick?
- Diagnosing the P1108 code typically involves using an OBDII scanner to retrieve the code, checking the MAP and BARO sensors for proper operation, inspecting the wiring for any damage, and testing for vacuum leaks.
5. Can I continue driving my Buick with the P1108 code present?
- It is not recommended to continue driving your vehicle with the P1108 code present, as it can lead to poor engine performance and potential damage if left unresolved.
6. How can I repair the P1108 code in my Buick?
- Repairing the P1108 code may involve replacing the faulty MAP or BARO sensor, repairing any damaged wiring, fixing vacuum leaks, or resetting the engine's computer after addressing the issue.
7. Are there any DIY tips for troubleshooting the P1108 code in a Buick?
- DIY tips include checking for loose or damaged vacuum hoses, cleaning the MAP and BARO sensors, and ensuring all electrical connections are secure and free of corrosion.
8. How much does it typically cost to fix the P1108 code in a Buick?
- The cost of fixing the P1108 code can vary depending on the exact cause of the issue, but it may range from $100 to $500 for parts and labor.
9. Will resetting the Check Engine Light make the P1108 code go away permanently?
- Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue causing the P1108 code is not addressed, it is likely to return.
10. Is it necessary to visit a mechanic to fix the P1108 code in a Buick?
- While some DIY troubleshooting may be possible, it is recommended to visit a qualified mechanic to accurately diagnose and repair the P1108 code to ensure proper functioning of your vehicle.
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