AutoCodes – Buick – P0727 Buick

P0727 Buick Code - Engine Speed - No Signal

Quick Answer

The Automatic Transmission Control Module (TCM) receives transmission-related information from the Engine Control Module (ECM) via serial data. Common causes include Check other engine related codes first, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted. 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: P0727 Buick indicates Engine Speed - No Signal.
Common causes: Common causes include Check other engine related codes first, Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted.
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 589

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 Jul 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0727 Buick Description

The Automatic Transmission Control Module (TCM) receives transmission-related information from the Engine Control Module (ECM) via serial data. When the ECM receives invalid transmission-related information, it notifies the TCM. The TCM then sets the appropriate Diagnostic Trouble Code (DTC).

OBDII Code P0727 Buick - Engine Speed - No Signal - AutoCodes.com — P0727 Buick Code - Engine Speed - No Signal

What does this mean?

What are the Possible Causes of the DTC P0727 Buick?

Check other engine related codes first
Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P0727 Buick?

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 P0727 Buick 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 P0727 Buick code?

Need more information on how to fix the P0727 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0727 Buick code diagnosed by a professional: Find a repair shop in your area

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 P0727 Buick Code

1. What does the OBDII code P0727 mean on a Buick?

P0727 indicates that the Powertrain Control Module (PCM) is not receiving an engine speed signal from the crankshaft position sensor or other related components.

2. What are the symptoms of code P0727 on a Buick?

Common symptoms include poor engine performance, stalling, difficulty shifting gears, illuminated check engine light, and the vehicle going into limp mode.

3. What causes the P0727 code to appear on a Buick?

Potential causes include a faulty crankshaft position sensor, damaged wiring or connectors, a malfunctioning PCM, or issues with the transmission control module (TCM).

4. Can I drive my Buick with a P0727 code?

Driving with a P0727 code is not recommended, as it can lead to poor performance, unsafe driving conditions, and potential damage to the engine or transmission.

5. How is the P0727 code diagnosed on a Buick?

A mechanic will use an OBDII scanner to confirm the code, inspect the crankshaft position sensor, check wiring and connectors for damage, and test the PCM and TCM for proper functionality.

6. How do you fix the P0727 code on a Buick?

Repairs may include replacing the crankshaft position sensor, repairing or replacing damaged wiring, cleaning or reseating connectors, reprogramming the PCM, or replacing faulty modules.

7. How much does it cost to fix a P0727 code on a Buick?

Repair costs vary, but replacing a crankshaft position sensor typically costs $150-$300, including parts and labor. More extensive repairs, like PCM replacement, can cost significantly more.

8. Can a bad battery cause the P0727 code on a Buick?

Yes, a weak or failing battery can cause electrical issues that might interfere with the crankshaft position sensor or PCM, potentially triggering the P0727 code.

9. Does the P0727 code affect the transmission on a Buick?

Yes, the P0727 code can cause shifting problems or force the transmission into limp mode due to the lack of an engine speed signal.

10. Can I reset the P0727 code on my Buick without fixing the issue?

While you can clear the code with an OBDII scanner, it will likely return if the underlying issue is not resolved. Always address the root cause to avoid further complications.