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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 P0690

OBDII error code P0690 is a generic trouble code that indicates a problem with the Engine Control Module (ECM) or Powertrain Control Module (PCM) power relay sense circuit. This circuit is responsible for providing power to the ECM/PCM, which is the brain of the vehicle''s engine management system. The power relay is controlled by the ECM/PCM and is used to switch the power supply to the module on and off. When the ECM/PCM detects a high voltage condition on the power relay sense circuit, it sets the P0690 code.

The power relay sense circuit is designed to monitor the voltage supply to the ECM/PCM and ensure that it remains within a specified range. If the voltage exceeds the maximum allowed limit, the ECM/PCM will shut down to prevent damage to the module or other electrical components. The P0690 code is typically accompanied by other trouble codes that indicate a problem with the engine management system, such as P0600, P0602, or P0603.

Possible Causes of Error P0690

  • Short circuit in the power relay sense circuit
  • High resistance in the power relay sense circuit
  • Failed or faulty power relay
  • ECM/PCM internal fault or malfunction
  • Wiring or connector damage in the power relay sense circuit
  • Corrosion or water damage in the power relay sense circuit
  • Incorrect or faulty wiring repair
  • Aftermarket accessories or modifications that interfere with the power relay sense circuit

Possible Fixes for Error P0690

  • Check the power relay sense circuit for signs of damage, corrosion, or wear
  • Use a multimeter to measure the voltage in the power relay sense circuit
  • Check the power relay for proper operation and replace if necessary
  • Inspect the ECM/PCM and its connectors for signs of damage or corrosion
  • Check the wiring and connectors in the power relay sense circuit for damage or corrosion
  • Use a scan tool to monitor the power relay sense circuit and identify the source of the high voltage condition
  • Consult a professional mechanic or the vehicle''s repair manual for further diagnosis and repair
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