AutoCodes – Generic – P034A

P034A Code - Crankshaft Position Sensor Engine Start Position Incorrect

Quick Answer

The Engine Control Module (ECM) monitors the speed and the direction of rotation of the crankshaft during an autostop event and memorizes the crankshaft angle at which the engine stopped to be able to start the engine quicker. Common causes include Faulty Crankshaft Position Sensor, Crankshaft Position Sensor harness is open or shorted, Crankshaft 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: P034A indicates Crankshaft Position Sensor Engine Start Position Incorrect.
Common causes: Common causes include Faulty Crankshaft Position Sensor, Crankshaft Position Sensor harness is open or shorted, Crankshaft 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,575

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 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P034A Description

The Engine Control Module (ECM) monitors the speed and the direction of rotation of the crankshaft during an autostop event and memorizes the crankshaft angle at which the engine stopped to be able to start the engine quicker. The Diagnostic Trouble Code (DTC) will be set when the difference between the memorized and actual crankshaft position was greater than 1 reluctor ring teeth during 2 autostart events in one ignition cycle.

OBDII Code P034A - Crankshaft Position Sensor Engine Start Position Incorrect - AutoCodes.com — P034A Code - Crankshaft Position Sensor Engine Start Position Incorrect

What does this mean?

What are the Possible Causes of the DTC P034A?

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

How to Fix the DTC P034A?

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 P034A 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 P034A code?

Need more information on how to fix the P034A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P034A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P034A Buick — Crankshaft Position Sensor Engine Start Position Incorrect
P034A Cadillac — Crankshaft Position Sensor Engine Start Position Incorrect
P034A Chevrolet — Crankshaft Position Sensor Engine Start Position Incorrect
P034A GMC — Crankshaft Position Sensor Engine Start Position Incorrect

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 P034A Code

1. What are common symptoms of OBDII code P034A (Crankshaft Position Sensor Engine Start Position Incorrect)?

- Hard starting or no start condition, rough idling, engine misfires, and potential stalling.

2. What typically causes the OBDII code P034A?

- The most common cause is a faulty crankshaft position sensor, which may be damaged or misaligned.

3. How can I diagnose the issue related to code P034A?

- Use a diagnostic scanner to read the code, visually inspect the crankshaft position sensor and its wiring, and perform a continuity test.

4. Can a bad camshaft position sensor trigger code P034A?

- Yes, a malfunctioning camshaft position sensor can sometimes lead to the incorrect engine start position and trigger code P034A.

5. What are the possible repair options for resolving code P034A?

- Replace the faulty crankshaft position sensor, adjust its position if misaligned, or repair any damaged wiring associated with the sensor.

6. Are there any precautionary measures to take when working on the crankshaft position sensor?

- Disconnect the battery before starting any repair work, follow proper safety procedures, and ensure the engine is cool before handling the sensor.

7. Can a dirty or contaminated sensor cause code P034A to appear?

- Yes, debris or oil contamination on the crankshaft position sensor can interfere with its proper functioning and trigger the error code.

8. Is it safe to continue driving with OBDII code P034A present?

- It is not recommended to drive the vehicle with a faulty crankshaft position sensor, as it can lead to potential engine performance issues and cause further damage.

9. Will resetting the error code make it go away permanently?

- Resetting the error code may temporarily turn off the check engine light, but if the underlying issue (faulty sensor) is not addressed, the code is likely to reappear.

10. How can a professional mechanic help in resolving OBDII code P034A?

- A mechanic can perform a thorough diagnosis, accurately pinpoint the cause of the issue, and provide expert repair or replacement of the crankshaft position sensor to resolve code P034A.