AutoCodes – RAM – P0238 RAM

P0238 RAM Code - MAP Sensor Voltage Too High

Quick Answer

Manifold Air Pressure (MAP) sensor voltage is monitored when the engine speed is more than 416 RPM, but less than 3520 RPM and battery voltage is more than 10.4 volts. Common causes include Faulty Manifold Air Pressure (MAP) sensor, Manifold Air Pressure sensor harness is open or shorted, Manifold Air 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: P0238 RAM indicates MAP Sensor Voltage Too High.
Common causes: Common causes include Faulty Manifold Air Pressure (MAP) sensor, Manifold Air Pressure sensor harness is open or shorted, Manifold Air 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.

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Code Popularity 787

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0238 RAM Description

Manifold Air Pressure (MAP) sensor voltage is monitored when the engine speed is more than 416 RPM, but less than 3520 RPM and battery voltage is more than 10.4 volts. The Diagnostic Trouble Code (DTC) may be stored if the Engine Control Module (ECM) senses the MAP sensor signal voltage is more than 4.88 volts at the start or with the engine running for 2 seconds.

OBDII Code P0238 RAM - MAP Sensor Voltage Too High - AutoCodes.com — P0238 RAM Code - MAP Sensor Voltage Too High

What does this mean?

What are the Possible Causes of the DTC P0238 RAM?

Faulty Manifold Air Pressure (MAP) sensor
Manifold Air Pressure sensor harness is open or shorted
Manifold Air Pressure sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0238 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 P0238 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.

Need more information about the P0238 RAM code?

Need more information on how to fix the P0238 RAM code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0238 RAM Code

1. What are the common symptoms of OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- Common symptoms include poor engine performance, engine stalling, rough idling, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- The main causes can be a faulty MAP (Manifold Absolute Pressure) sensor, a short circuit in the sensor wiring, a vacuum leak in the intake system, or issues with the engine's computer.

3. How can I diagnose the OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- Diagnosing this code involves using a scan tool to read the trouble codes, testing the MAP sensor with a multimeter, checking the sensor wiring for any damage, and inspecting the intake system for leaks.

4. Can a dirty or clogged MAP sensor cause OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- Yes, a dirty or clogged MAP sensor can potentially cause incorrect voltage readings and trigger the P0238 code. It's recommended to clean or replace the sensor if this is the case.

5. How do I repair OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- The repair typically involves replacing the faulty MAP sensor, repairing any damaged wiring, fixing any vacuum leaks, and clearing the trouble codes with a scan tool.

6. Is it safe to continue driving with OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- It's not recommended to drive with this code present, as it can lead to further engine problems and potential damage. It's best to address the issue promptly.

7. Can a DIY enthusiast fix OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- Depending on the skill level and tools available, a DIY enthusiast may be able to address this issue by following the repair steps carefully. However, professional help is recommended if unsure.

8. How much does it cost to repair OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- The cost of repairing this code can vary based on the cause of the issue, the cost of parts needed, and labor charges. It's advisable to consult a mechanic for a specific cost estimate.

9. Will resetting the ECU clear OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- Resetting the ECU may temporarily clear the trouble code, but if the underlying issue causing the code is not addressed, it is likely to reappear after driving the vehicle for some time.

10. Can extreme weather conditions trigger OBDII code P0238 RAM - MAP Sensor Voltage Too High?

- Extreme weather conditions, such as very high or low temperatures, can potentially affect the MAP sensor's performance and trigger the P0238 code. It's important to ensure the sensor is functioning properly in all conditions.