P1905 – OBD-II DTC

OBD-II DTC P1905 – OSS Circuit Intermittent Malfunction

DTC P1905 meaning

DTC P1905 refers to an “OSS Circuit Intermittent Malfunction.” OSS stands for Output Shaft Speed, which is a critical parameter in the vehicle’s transmission system. This code indicates that the Engine Control Module (ECM) has detected an intermittent issue with the signal from the output shaft speed sensor. The output shaft speed sensor monitors the rotational speed of the transmission output shaft, providing essential data for optimal transmission performance and engine management.

DTC P1905 symptoms

Common symptoms associated with DTC P1905 may include:

• Transmission slipping or erratic shifting
• Check Engine Light illuminated
• Unusual engine RPM fluctuations
• Delayed engagement when shifting from park to drive or reverse
• Reduced fuel efficiency

DTC P1905 causes

Several factors can lead to the triggering of DTC P1905, including:

• Faulty output shaft speed sensor
• Wiring issues, such as frayed or damaged wires
• Corroded or loose electrical connectors
• Faulty Engine Control Module (ECM)
• Transmission fluid issues, such as low levels or contamination

DTC P1905 seriousness

DTC P1905 is considered a moderate to serious issue. While it may not cause immediate catastrophic failure, it can lead to significant transmission problems if left unaddressed. Erratic shifting and slipping can result in further damage to the transmission, potentially leading to costly repairs. It is advisable to diagnose and resolve this issue promptly to maintain vehicle performance and reliability.

How to diagnose DTC P1905

To diagnose DTC P1905, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1905 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the output shaft speed sensor and its wiring for damage or corrosion.
4. Test the output shaft speed sensor using a multimeter to ensure it is functioning correctly.
5. Examine the ECM for any signs of failure or malfunction.
6. Check the transmission fluid level and condition.

How to fix DTC P1905 step-by-step instructions

To fix DTC P1905, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the output shaft speed sensor.
2. If the output shaft speed sensor is faulty, replace it with a new one.
3. Ensure that the ECM is functioning correctly replace it if necessary.
4. Check and top off the transmission fluid if it is low, and replace it if contaminated.
5. Clear the DTC using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved.

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