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P1671 Acura Code - Automatic Transmission To Engine Control Module No Signal

Quick Answer

The P1671 code for Acura vehicles indicates a communication issue between the automatic transmission and the engine control module (ECM). Common causes include Faulty wiring or connectors between transmission and ECM, Malfunctioning transmission control module (TCM), Faulty ECM. 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
P1671 Acura indicates Automatic Transmission To Engine Control Module No Signal.
Common causes
Common causes include Faulty wiring or connectors between transmission and ECM, Malfunctioning transmission control module (TCM), Faulty ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1671 Acura Description

The P1671 code for Acura vehicles indicates a communication issue between the automatic transmission and the engine control module (ECM). This means that the ECM is not receiving the necessary signals from the transmission to operate efficiently. The transmission and ECM need to communicate effectively to ensure proper shifting, fuel efficiency, and overall vehicle performance.

OBDII Code P1671 Acura - Automatic Transmission To Engine Control Module No Signal
P1671 Acura Code - Automatic Transmission To Engine Control Module No Signal

Common Causes of P1671 Acura

  1. Faulty wiring or connectors between transmission and ECM
  2. Malfunctioning transmission control module (TCM)
  3. Faulty ECM
  4. Corroded or damaged transmission sensors
  5. Electrical issues within the transmission system

Symptoms of P1671 Acura

  1. Harsh or delayed shifting
  2. Decreased fuel efficiency
  3. Engine stalling or hesitation
  4. Illuminated check engine light
  5. Reduced overall performance

How to Fix P1671 Acura

  1. Diagnose the issue using a scan tool to pinpoint the exact cause of the communication breakdown.
  2. Inspect and repair any damaged wiring or connectors between the transmission and ECM.
  3. Test and potentially replace the transmission control module (TCM) if faulty.
  4. Test and potentially replace the ECM if deemed necessary.
  5. Clear the code and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1671 Acura

The cost to repair the P1671 code can vary depending on the exact cause of the issue and the labor rates in your area. Generally, the cost for this repair can range from $200 to $600, including parts and labor. Keep in mind that the specific diagnosis time and labor rates at auto repair shops can vary, so it's best to obtain a few quotes to get a more accurate estimate for your specific situation.

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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.

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