P0880: TCM Power Input Signal

The transmission control module (TCM) regulates shift timing and application. It controls the transmission, so it must always have good ground and power. If the powertrain control module (PCM) detects a fault in the TCM, it might log a P0880 code.

What Does the P0880 Code Mean?

Diagnostic trouble code (DTC) P0880 stands for “TCM Power Input Signal.”

The TCM identifies the best transmission settings and manages different aspects of transmission operation. To determine whether the transmission is shifting effectively, the PCM analyzes voltage input signals from the transmission input speed sensor and transmission output speed sensor.

Once the PCM detects an electrical or mechanical malfunction within the TCM power input circuit, it’ll trigger the P0880 code.

TCM-related codes can be stored as P-codes, B-codes, or even U-codes, depending on the vehicle’s make and model. The PCM often logs other PCM and/or TCM codes when it triggers a P0880 code. It could also log codes for the ABS (antilock braking system).

Note: The definition of code P0880 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0880 Code?

• Bad relay
• Blown fuse
• Malfunctioning vehicle speed sensor
• Open or shorted circuits
• Mechanical transmission failure
• Bad TCM or PCM (programming error)

What are the Common Symptoms of the P0880 Code?

• Disabled electronic traction control
• Irregular transmission shift patterns
• Transmission shift failure
• Disabled ABS
• Other related codes

How to Diagnose the P0880 Code

P0880 is a generic trouble code that various vehicles can log, but that doesn’t mean that there’s only one process to determine what’s causing it. After all, automakers don’t build their vehicles the same way as other car manufacturers, so there are bound to be differences in the diagnostic process.

If you don’t have enough tools and knowledge to get the job done, it’s best to leave the job to a trusted mechanic. Otherwise, you can go ahead and do it yourself. Check out this video to find out what the diagnostic process might involve:

How to Fix the P0880 Code

Fixing a P0880 code can be tricky. Aside from in-depth knowledge about your ride’s transmission, you’ll also need specific tools and car repair know-how to fix this error code. The good news is that you always have the option to take your ride to a licensed mechanic to resolve the problem. 
However, if you’re confident you can address code P0880 on your own, don’t forget to research the vehicle-specific repair information before you get started. You might want to consult guides like those Chilton or an ALLDATA subscription.