AutoCodes – Generic – P127B

P127B Code - Aborted Engine Start

Quick Answer

The Engine Control Module (ECM) monitors the Camshaft Position Sensor. Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position 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: P127B indicates Aborted Engine Start.
Common causes: Common causes include Faulty Camshaft Position Sensor, Camshaft Position Sensor harness is open or shorted, Camshaft Position 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 3,230

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 Sep 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P127B Description

The Engine Control Module (ECM) monitors the Camshaft Position Sensor. The ECM sets the OBDII code when the Camshaft Position Sensor is not to factory specifications.

OBDII Code P127B - Aborted Engine Start - AutoCodes.com — P127B Code - Aborted Engine Start

What does this mean?

What are the Possible Causes of the DTC P127B?

Faulty Camshaft Position Sensor
Camshaft Position Sensor harness is open or shorted
Camshaft Position Sensor circuit poor electrical connection

How to Fix the DTC P127B?

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 P127B 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 P127B code?

Need more information on how to fix the P127B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P127B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P127B BMW — Nitrogen Oxide Sensor Overrun Test NOx Signal Too Low
P127B Ford — Aborted Engine Start
P127B MINI — Nitrogen Oxide Sensor Overrun Test NOx Signal Too Low

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 P127B Code

1. What are the common symptoms of OBDII code P127B (Aborted Engine Start)?

- Common symptoms include difficulty starting the engine, rough idling, and poor engine performance.

2. What are the possible causes of OBDII code P127B?

- The code P127B can be caused by issues such as a faulty crankshaft position sensor, a malfunctioning camshaft position sensor, or a problem with the fuel system.

3. How can I diagnose the OBDII code P127B?

- To diagnose the code P127B, you can use an OBDII scanner to retrieve the code and then perform a visual inspection of the engine components related to the symptoms.

4. What are some repair tips for fixing OBDII code P127B?

- Repair tips may include checking and replacing the crankshaft and camshaft position sensors, inspecting the fuel system for clogs or leaks, and ensuring proper fuel pressure.

5. Can I still drive my vehicle with OBDII code P127B?

- It is not recommended to drive your vehicle with the code P127B, as it can lead to further engine damage and poor performance. It is best to address the issue promptly.

6. How serious is OBDII code P127B?

- OBDII code P127B is a serious issue as it can affect the overall performance and reliability of your vehicle. Ignoring the code can lead to more severe engine problems.

7. How much does it cost to repair OBDII code P127B?

- The cost of repairing OBDII code P127B can vary depending on the specific cause of the issue. It is recommended to consult with a mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P127B at home?

- Depending on your experience and access to tools, some DIY enthusiasts may be able to address the issue causing OBDII code P127B. However, complex repairs may require professional assistance.

9. How long does it typically take to repair OBDII code P127B?

- The repair time for OBDII code P127B can vary based on the cause of the issue and the extent of repairs needed. Simple fixes may take a few hours, while more complex issues may require more time.

10. Are there any preventative maintenance steps to avoid OBDII code P127B in the future?

- Regular maintenance, such as changing the oil and filters on time, monitoring engine performance, and addressing any issues promptly, can help prevent OBDII code P127B from occurring.