AutoCodes – Generic – P158E

P158E Code - Cold Start Idle Air Control System Bank 1 RPM Higher Than Expected

Quick Answer

The Engine Control Module (ECM) monitors the Cold Start Idle Air Control System. Common causes include Faulty Cold Start Idle Air Control System, Cold Start Idle Air Control System harness is open or shorted, Cold Start Idle Air Control System 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: P158E indicates Cold Start Idle Air Control System Bank 1 RPM Higher Than Expected.
Common causes: Common causes include Faulty Cold Start Idle Air Control System, Cold Start Idle Air Control System harness is open or shorted, Cold Start Idle Air Control System 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 1,499

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 Jan 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P158E Description

The Engine Control Module (ECM) monitors the Cold Start Idle Air Control System. The ECM sets the OBDII code when the Cold Start Idle Air Control System is not to factory specifications.

OBDII Code P158E - Cold Start Idle Air Control System Bank 1 RPM Higher Than Expected - AutoCodes.com — P158E Code - Cold Start Idle Air Control System Bank 1 RPM Higher Than Expected

What does this mean?

What are the Possible Causes of the DTC P158E?

Faulty Cold Start Idle Air Control System
Cold Start Idle Air Control System harness is open or shorted
Cold Start Idle Air Control System circuit poor electrical connection

How to Fix the DTC P158E?

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 P158E 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 P158E code?

Need more information on how to fix the P158E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P158E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P158E BMW — Cold Start Idle Air Control System Bank 1 RPM Higher Than Expected
P158E MINI — Cold Start Idle Air Control System Bank 1 RPM Higher Than Expected

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 P158E Code

1. What are the common symptoms of OBDII code P158E?

- Common symptoms of code P158E include higher than expected RPM during a cold start, rough idle, decreased fuel efficiency, and potential stalling.

2. What can cause the OBDII code P158E to occur?

- The code P158E is typically triggered by a fault in the idle air control system in Bank 1, which can be caused by issues such as a faulty idle air control valve, vacuum leaks, or a malfunctioning throttle body.

3. How serious is the OBDII code P158E?

- While the code P158E may not cause immediate harm to the vehicle, it can lead to poor engine performance and decreased fuel efficiency if left unaddressed. It is recommended to have it diagnosed and repaired promptly.

4. Can I continue driving with the OBDII code P158E present?

- It is not recommended to continue driving with the code P158E present, as it can potentially lead to further damage to the engine or emissions system. It is best to address the issue as soon as possible.

5. How can I diagnose the OBDII code P158E?

- Diagnosing the code P158E typically involves using an OBDII scanner to retrieve the code, checking for any related symptoms like rough idle or high RPM, and inspecting components of the idle air control system.

6. What are some repair tips for fixing the OBDII code P158E?

- Repair tips for addressing the code P158E may include cleaning or replacing the idle air control valve, checking for and repairing any vacuum leaks, inspecting and cleaning the throttle body, and ensuring proper operation of related sensors.

7. Can a DIY enthusiast fix the OBDII code P158E?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to address the code P158E by following repair guides or videos. However, if unsure, it is recommended to seek professional help.

8. How much does it cost to repair the OBDII code P158E?

- The cost of repairing the code P158E can vary depending on the underlying cause, parts needed, and labor rates. It is advisable to obtain quotes from automotive repair shops for an accurate estimate.

9. Are there any preventive measures to avoid the OBDII code P158E?

- To help prevent the code P158E, regular maintenance of the idle air control system, including cleaning or replacing components as needed, and addressing any issues promptly can be beneficial.

10. Can weather conditions affect the occurrence of the OBDII code P158E?

- Extreme weather conditions, such as very cold temperatures, can potentially exacerbate issues related to the idle air control system and lead to the triggering of the code P158E.