AutoCodes – Generic – P0888

P0888 Code - Transmission Relay Always Off

Quick Answer

The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. Common causes include Transmission Control Relay harness is open or shorted, Transmission Control Relay circuit poor electrical connection, Faulty Transmission Control Relay. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0888 indicates Transmission Relay Always Off.
Common causes: Common causes include Transmission Control Relay harness is open or shorted, Transmission Control Relay circuit poor electrical connection, Faulty Transmission Control Relay.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 18,386

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0888 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.

OBDII Code P0888 - Transmission Relay Always Off - AutoCodes.com — P0888 Code - Transmission Relay Always Off

What does this mean?

What are the Possible Causes of the DTC P0888?

Transmission Control Relay harness is open or shorted
Transmission Control Relay circuit poor electrical connection
Faulty Transmission Control Relay

How to Fix the DTC P0888?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0888 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0888 code?

Need more information on how to fix the P0888 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0888 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0888 Chrysler — Transmission Relay Always Off
P0888 Dodge — Transmission Relay Always Off
P0888 Jeep — Transmission Relay Always Off

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0888 Code

1. What are the common symptoms of OBDII code P0888 (Transmission Relay Always Off)?

- Common symptoms include issues with shifting gears, transmission slipping, and the vehicle going into limp mode.

2. What could cause the OBDII code P0888 to be triggered?

- The code P0888 is typically triggered by a malfunction in the transmission relay circuit, such as a faulty relay or wiring issue.

3. How can I diagnose the cause of OBDII code P0888?

- To diagnose the cause of P0888, you may need to inspect the transmission relay, check the wiring for any damage or loose connections, and test the relay circuit for proper operation.

4. What are some possible repair tips for fixing OBDII code P0888?

- Repair tips may include replacing the faulty transmission relay, repairing any damaged wiring, ensuring proper connections, and resetting the trouble code with an OBDII scanner.

5. Can driving with OBDII code P0888 cause further damage to the vehicle?

- Continuing to drive with code P0888 may lead to further transmission issues, such as increased risk of damage to transmission components and decreased overall drivability.

6. Is it safe to ignore OBDII code P0888 and continue driving the vehicle?

- It is not recommended to ignore OBDII code P0888, as it indicates a potential problem with the transmission relay circuit that could lead to more serious issues if left unaddressed.

7. How much does it typically cost to repair OBDII code P0888?

- The cost of repairing OBDII code P0888 can vary depending on the underlying cause, but it may range from $100 to $300 for parts and labor.

8. Can a DIY enthusiast fix OBDII code P0888 at home?

- Depending on the specific cause of P0888, DIY enthusiasts with automotive repair experience may be able to diagnose and repair the issue at home by following proper diagnostic procedures and using the right tools.

9. How long does it usually take to repair OBDII code P0888?

- The repair time for OBDII code P0888 can vary based on the complexity of the issue and the availability of parts, but it typically takes a few hours to complete the repair.

10. Is it necessary to reset the OBDII system after fixing code P0888?

- Yes, it is recommended to reset the OBDII system after fixing code P0888 to clear the trouble code and ensure that the repairs have been successful.