P0880 on Chevrolet: How to Diagnose & Fix
TCM Power Input Signal
1 Chevrolet model · 1 documented issue · 1 critical · $800-$1,800 repair
P0880 on Chevrolet by model: symptoms, diagnosis and fix
The Transmission Control Module (TCM) mounted internally on the Allison 1000 transmission fails due to heat exposure and vibration. The internal TCM is bathed in transmission fluid and subjected to extreme temperatures. When it fails, the transmission goes into limp mode or refuses to shift from 3rd gear.
Common Symptoms
- Transmission stuck in 3rd gear
- Limp mode activation
- Check engine light with transmission codes
- Harsh or erratic shifting
- No upshift from 1st gear
How to Fix
Replace the internal TCM (ITCM) inside the Allison transmission. This requires dropping the transmission pan and valve body for access. The new TCM must be programmed with the correct transmission calibration for your specific truck and axle ratio. Reprogram with the latest Allison calibration files.
Sources for this issue (1)
P0880 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0880 mean on a Chevrolet?
P0880 stands for "TCM Power Input Signal." This code sets when the transmission control module (TCM) does not receive the correct power/voltage on its power input circuit. The TCM needs a stable supply to control shifting, so a power-feed problem can cause it to lose control of the transmission. Symptoms include erratic or failed shifting, the transmission dropping into failsafe/limp mode, and sometimes disabled related functions. The problem is typically in the TCM's power supply circuit (fuse, relay, or wiring) rather than the transmission internals. On Chevrolet it is documented across 1 model: Silverado 3500HD.
What are the most common causes of P0880?
The most common causes of P0880 are: Faulty TCM power relay, Blown fuse on the TCM power circuit, Corroded, loose, or damaged power/ground wiring or connectors, Poor ground connection, Low system/battery voltage or charging fault, Internal TCM power-supply fault, Faulty TCM (less common). The specific cause varies by vehicle.
How much does it cost to fix P0880 on a Chevrolet?
Published repair estimates on Chevrolet range from $800 to $1,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0880 on a different make?
View P0880 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.