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OBDII/EOBD diagnostics trouble codes definition

If your car is equipped with OBD-II or EOBD, you can access over 5,000 generic OBD-II diagnostic trouble codes (DTCs). These codes cover various vehicle systems, including Powertrain (P0XXX, P2XXX, P34XX), Body (B0XXX), Chassis (C0XXX), and Network/Communication (U0XXX, U2XXX, U3XXX). Additionally, there are more than 13,500 manufacturer-specific OBD-II codes available for diagnosing issues unique to different car brands and models. Make sure you're equipped with the right tools to understand and resolve these trouble codes to keep your vehicle running smoothly.

By using these OBD-II codes, you can effectively diagnose issues related to engine performance, safety features, suspension, and more.

Supported manufacturers with specific OBD2 codes:

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Detailed Description of Error P0701

The OBD-II error code P0701 stands for ''Transmission Control System Range/Performance''. This code is triggered when the Transmission Control Module (TCM) detects a problem with the transmission''s ability to engage the correct gear or maintain the proper gear ratio. The TCM is responsible for controlling the transmission''s shifting, torque converter engagement, and clutch application. When the TCM detects an issue with the transmission''s performance, it sets the P0701 code and illuminates the Check Engine Light (CEL) to alert the driver.

In modern vehicles, the transmission control system is a complex network of sensors, solenoids, and hydraulic components that work together to provide smooth and efficient gear shifts. The TCM receives input from various sensors, such as the throttle position sensor, vehicle speed sensor, and transmission temperature sensor, to determine the optimal gear ratio for the current driving conditions. If the TCM detects a discrepancy between the desired gear ratio and the actual gear ratio, it will set the P0701 code.

Possible Causes of Error P0701

  • Low transmission fluid level or dirty transmission fluid
  • Faulty transmission temperature sensor
  • Faulty throttle position sensor
  • Faulty vehicle speed sensor
  • Faulty transmission range sensor
  • Faulty transmission solenoids or valves
  • Worn or damaged transmission clutch packs or bands
  • Transmission internal mechanical failure
  • TCM software or programming issue
  • Wiring or connector issues between the TCM and transmission components

Possible Fixes for Error P0701

  1. Check the transmission fluid level and condition. Top off the fluid if necessary, and replace it if it''s dirty or degraded.
  2. Inspect the transmission temperature sensor, throttle position sensor, and vehicle speed sensor for any signs of damage or corrosion. Replace them if necessary.
  3. Use a scan tool to monitor the transmission''s performance and identify any specific trouble areas.
  4. Perform a transmission system reset or relearn procedure to recalibrate the TCM.
  5. Replace any faulty transmission solenoids or valves.
  6. Repair or replace any worn or damaged transmission clutch packs or bands.
  7. If the problem persists, it may be necessary to replace the transmission or have it rebuilt by a qualified technician.