P0105 GMC Code - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
Quick Answer
The Manifold Absolute Pressure (MAP) sensor measures the pressure inside the intake manifold. Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure 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
- P0105 GMC indicates Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction.
- Common causes
- Common causes include Faulty Manifold Absolute Pressure (MAP) Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure 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 P0105 GMC Description
The MAP sensor wiring includes 3 circuits. The Engine Control Module (ECM) supplies a regulated 5 volts to the sensor on a 5 V reference circuit. The ECM supplies ground on a low reference circuit. The MAP sensor provides a signal voltage to the ECM, relative to the pressure changes, on the MAP sensor signal circuit. The ECM converts the signal voltage input to a pressure value.
Under normal operation the greatest pressure that can exist in the intake manifold is at ignition ON, engine OFF, which is equal to the BARO. The lowest manifold pressure occurs when the vehicle is idling or decelerating. The ECM monitors the MAP sensor signal for pressure outside of the normal range.
The Diagnostic Trouble Code (DTC) will be set when the ECM receives an excessively low or high voltage from the MAP Sensor.
What are the Possible Causes of the DTC P0105 GMC?
- Faulty Manifold Absolute Pressure (MAP) Sensor
- Manifold Absolute Pressure Sensor harness is open or shorted
- Manifold Absolute Pressure Sensor circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0105 GMC?
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 P0105 GMC 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 P0105 GMC Code
1. What are the common symptoms of OBDII code P0105 in a GMC vehicle?
- Common symptoms include poor engine performance, rough idling, stalling, decreased fuel efficiency, and illuminated Check Engine Light.
2. What does the OBDII code P0105 for GMC indicate?
- This code indicates a malfunction in the Manifold Absolute Pressure (MAP) or Barometric Pressure (BARO) circuit.
3. What are the possible causes of OBDII code P0105 in a GMC vehicle?
- Possible causes include a faulty MAP sensor, damaged wiring or connectors in the MAP circuit, a vacuum leak, or a problem with the PCM (Powertrain Control Module).
4. How can I diagnose the cause of OBDII code P0105 in my GMC?
- You can use a scan tool to read the code and data from the MAP sensor to check for proper sensor operation, inspect the wiring and connectors for damage, perform a vacuum leak test, and test the PCM if necessary.
5. Can I still drive my GMC with the P0105 code?
- It is not recommended to drive your vehicle with code P0105 as it can lead to more serious engine problems and further damage if left unresolved.
6. Is it possible to repair OBDII code P0105 in my GMC by myself?
- The repair for code P0105 can vary in complexity, but tasks such as checking for vacuum leaks or replacing a faulty MAP sensor can often be done by DIY enthusiasts with the right tools and knowledge.
7. How much does it typically cost to fix OBDII code P0105 in a GMC?
- The cost of fixing code P0105 can vary depending on the exact cause of the issue and whether you do the repairs yourself or take it to a mechanic. Costs can range from a few dollars for a simple fix to a few hundred dollars for more extensive repairs.
8. Can a dirty air filter cause OBDII code P0105 in a GMC?
- Yes, a dirty air filter can restrict airflow to the MAP sensor, leading to incorrect readings and potentially triggering code P0105. It's a good idea to check and replace the air filter if needed during diagnosis.
9. Will resetting the OBDII code P0105 in my GMC make it go away permanently?
- Resetting the code without addressing the underlying issue will not make it go away permanently. The problem causing the code needs to be diagnosed and repaired for the Check Engine Light to stay off.
10. How long can I safely drive with OBDII code P0105 before getting it fixed?
- It's best to address code P0105 as soon as possible to prevent potential damage to your GMC's engine. Continuing to drive with this code can lead to more severe issues over time.
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