The P0899 trouble code signals a high signal from the transmission control system MIL (Malfunction Indicator Lamp) request circuit.
P0899 Transmission Control System MIL Request Circuit High
Code symptoms P0899.
1. The Check Engine Light (CEL) may illuminate on the dashboard.
2. Other related trouble codes may be present.
3. No noticeable drivability issues may be experienced.
Causes of the code P0899.
1. Faulty wiring or connectors in the transmission control system MIL request circuit.
2. Poor electrical connections.
3. A defective transmission control module (TCM).
4. Issues with the powertrain control module (PCM).
Code Solutions P0899.
1. Inspect the wiring and connectors in the transmission control system MIL request circuit for any signs of damage or corrosion.
2. Repair or replace any damaged wiring or connectors.
3. Ensure all electrical connections are secure and free of corrosion.
4. If necessary, replace the transmission control module (TCM) or powertrain control module (PCM) as needed.