P0108 RAM Code - Manifold Absolute Pressure Sensor Circuit High
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
- P0108 RAM indicates Manifold Absolute Pressure Sensor Circuit High.
- 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 P0108 RAM 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 detects that the MAP Sensor voltage is more than 4.50 V for greater than 13 ms.
What are the Possible Causes of the DTC P0108 RAM?
- 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 P0108 RAM?
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 P0108 RAM 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 P0108 RAM Code
1. What are the common symptoms of OBDII code P0108?
The common symptoms of OBDII code P0108 (MAP Sensor Circuit High) include rough idling, poor acceleration, decreased fuel efficiency, and potential stalling of the vehicle.
2. What are the possible causes of OBDII code P0108?
Possible causes of OBDII code P0108 include a faulty MAP sensor, damaged wiring or connectors in the MAP sensor circuit, a vacuum leak in the intake manifold, or a problem with the engine control module (ECM).
3. How can I diagnose OBDII code P0108?
To diagnose OBDII code P0108, you can use an OBDII scanner to read the trouble code and check the voltage output of the MAP sensor. Inspect the wiring and connectors for any visible damage. You may also need to perform a smoke test to check for vacuum leaks.
4. Can a dirty air filter cause OBDII code P0108?
Yes, a dirty or clogged air filter can disrupt the airflow to the MAP sensor, leading to incorrect readings and potentially triggering OBDII code P0108.
5. How can I repair OBDII code P0108?
To repair OBDII code P0108, you may need to replace the MAP sensor if it is faulty. Check and repair any damaged wiring or connectors in the MAP sensor circuit. Ensure the intake manifold is free from leaks and that the air filter is clean.
6. Will driving with OBDII code P0108 cause further damage to the vehicle?
Continuing to drive with OBDII code P0108 may lead to decreased engine performance, reduced fuel efficiency, and potential damage to other engine components over time. It is recommended to address the issue promptly.
7. How much does it typically cost to repair OBDII code P0108?
The cost to repair OBDII code P0108 can vary depending on the underlying cause. Replacing a faulty MAP sensor can cost anywhere from $50 to $200, while fixing wiring or vacuum leaks may involve additional labor costs.
8. Can I reset OBDII code P0108 without making any repairs?
Resetting OBDII code P0108 without addressing the underlying issue will only temporarily turn off the check engine light. The code is likely to reappear once the ECM detects the same problem again.
9. Is it safe to drive my vehicle with OBDII code P0108?
It is generally safe to drive the vehicle with OBDII code P0108 in the short term, but it is advisable to address the issue promptly to prevent potential engine performance issues or further damage.
10. How long does it take to repair OBDII code P0108?
The time needed to repair OBDII code P0108 can vary depending on the cause of the issue and the complexity of the repair. It may take anywhere from 1 to 3 hours for a mechanic to diagnose and fix the problem.
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