- Faulty Transmission Control Relay - Transmission Control Relay harness is open or shorted - Transmission Control Relay circuit poor electrical connection - Faulty Transmission Solenoid/Pressure Switch Assembly
Inadequate Transmission Control Relay Output voltage can also cause DTCs P0846, P0869, P0871, P0876 or P0988 to set. This does not indicate an internal transmission or solenoid TRS problem. Repairing the P0888 fault should also eliminate the related DTCs.
This code is set when less than 3 volts are present at the Transmission Control Relay Output (switched battery) terminals at the Powertrain Control Module (PCM), when the PCM is energizing the relay.
- Engine Light ON (or Service Engine Soon Warning Light)
P0888 Dodge Description
The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the Powertrain Control Module (PCM). It is referred to as the Transmission Control Relay Output circuit or switched battery.
After a controller reset (ignition key turned to the run position or after cranking engine), the controller energizes the relay. Prior to this the PCM verifies that the contacts are open by checking for no voltage at the switched battery terminals. After the relay is energized, the PCM monitors the terminals to verify that the voltage is greater than 3 volts.
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