What is a transmission relay switch?

A transmission relay is usually located in the power distribution box under the hood on the driver’s side of the vehicle. It is responsible for sending signals to the transmission solenoids that enable the automatic transmission to shift into and out of the proper gear.

How do you test a transmission control relay?

Check the control side of the circuit Remove the transmission control relay. Turn the vehicle ignition on and use a test light to check for power to the TCR. Connect the test light between the battery negative terminal and the relay control terminal in the fuse box. The light should illuminate.

What does a TCM relay do?

The TCM power relay control circuit exists between the battery and the transmission control module, and protects the transmission’s computer from voltage irregularities. It also allows for a self test when the ignition key is turned on.

What are the symptoms of a bad transmission control module?

Some common signs of a bad transmission control module include:

• Unpredictable shifting.
• Trouble shifting into higher gear.
• Trouble downshifting.
• Getting stuck in the same gear.
• Poor fuel economy.
• Check engine light comes on.

How do I fix code P0888?

Use contact cleaner if necessary. Replace TCR if necessary. Replace TCR harness if necessary. Replace transmission solenoid/pressure switch assembly if necessary.

How do you know if your ignition relay is bad?

Symptoms of a Bad or Failing Ignition Relay

1. Car suddenly stalls while operating. One of the most common symptoms of a failed ignition relay is a car that suddenly stalls while operating.
2. Car not starting. Another symptom of a faulty ignition relay is a no power condition.
3. Dead battery.
4. Burned relay.

Can I drive my car with a bad TCM?

If you ever have a problem with your transmission control module, you’ll need to have it inspected right away. A bad TCM will spell trouble for your vehicle and your ability to drive it.

What does the OBD-2 trouble code p0888 mean?

P0888 is the OBD-II trouble code indicating a problem with the transmission control relay or else somewhere in the related circuitry. The transmission control relay supplies power to the solenoid pack when the transmission is functioning properly.

What causes p0888 Dodge transmission relay to be always off?

P0888 DODGE Possible Causes 1 Faulty Transmission Control Relay 2 Transmission Control Relay harness is open or shorted 3 Transmission Control Relay circuit poor electrical connection 4 Faulty Transmission Solenoid/Pressure Switch Assembly

How much does it cost to repair a p0888 Dodge engine?

The cost to diagnose the P0888 DODGE code is 1.0 hour of labor. The auto repair’s diagnosis time and labor rates vary by location, vehicle’s make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.