P0801 – OBD-II DTC

OBD-II DTC P0801 – Shift/Timing Solenoid Low

DTC P0801 meaning

DTC P0801 refers to a diagnostic trouble code indicating a problem with the shift or timing solenoid in an automatic transmission. This code specifically points to a low voltage or malfunction in the solenoid circuit, which is responsible for controlling the transmission’s shifting process. The solenoid plays a crucial role in regulating fluid flow within the transmission, affecting gear changes and overall performance.

DTC P0801 symptoms

Common symptoms associated with DTC P0801 may include:

• Delayed or harsh shifting between gears
• Transmission slipping or failing to engage
• Check Engine Light illuminated
• Unusual noises from the transmission
• Reduced fuel efficiency

DTC P0801 causes

Several factors can lead to the triggering of DTC P0801, including:

• Faulty shift solenoid
• Wiring issues or damaged connectors in the solenoid circuit
• Low transmission fluid levels or contamination
• Faulty transmission control module (TCM)
• Mechanical issues within the transmission

DTC P0801 seriousness

The seriousness of DTC P0801 can vary, but it is generally considered a moderate to high priority issue. If left unaddressed, it can lead to:

• Increased wear and tear on the transmission
• Complete transmission failure
• Unsafe driving conditions due to unpredictable shifting

How to diagnose DTC P0801

To diagnose DTC P0801, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0801 code.
2. Inspect the transmission fluid level and condition.
3. Check the wiring and connectors related to the shift solenoid for damage or corrosion.
4. Test the shift solenoid for proper operation using a multimeter.
5. Examine the transmission control module for faults.
6. Perform a road test to observe shifting behavior and any related symptoms.

How to fix DTC P0801 step-by-step instructions

To fix DTC P0801, follow these steps:

1. Ensure the vehicle is safely lifted and supported if necessary.
2. Check and top off the transmission fluid if low or contaminated.
3. Inspect and repair any damaged wiring or connectors in the solenoid circuit.
4. Replace the faulty shift solenoid if testing indicates it is malfunctioning.
5. Clear any stored codes using an OBD-II scanner.
6. Test drive the vehicle to ensure the issue is resolved and no new codes appear.

How to erase DTC P0801

To erase DTC P0801, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear Codes” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to check for any reoccurrence of the code.