Transmission · Powertrain · generic (SAE-defined)
P0882: TCM Power Input Signal Low
P0882 means the transmission control module has detected that its supply voltage is lower than expected, which can prevent it from operating the transmission correctly.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How P0882 sets
The transmission control module (TCM) monitors the voltage on its power input circuit. When that voltage stays below the minimum needed for reliable solenoid operation for a set period, it records P0882 and often places the transmission in a failsafe gear. The voltage limits and timing are manufacturer-specific.
Common causes of P0882
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Weak or failing battery
- Faulty alternator or charging system
- Corroded or loose battery terminals
- Blown fuse or bad relay in the TCM power circuit
- Poor ground connection to the TCM
- Damaged wiring in the TCM power feed
P0882 symptoms
- Check engine light on
- Transmission stuck in one gear (limp mode)
- Harsh shifts
- Battery or charging warning light
- Slow cranking or other electrical problems
How P0882 is diagnosed
- Test the battery and check charging voltage with the engine running.
- Clean and tighten battery terminals and inspect main grounds.
- Scan for other low-voltage codes in other modules.
- Check fuses and relays that feed the TCM.
- Measure voltage at the TCM power and ground pins under load.
- Clear codes and road test to confirm repair.
Typical fixes for P0882
- Replace a weak battery
- Repair or replace the alternator
- Clean battery terminals and repair grounds
- Replace a blown fuse or faulty relay
- Repair damaged wiring to the TCM
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Manufacturer notes
Commonly reported on Chrysler, Dodge, Jeep, and Ram vehicles, where low-voltage events often trigger it. Definitions can vary by manufacturer; check factory service information.
Related codes & warning lights
P0882 FAQ
What does code P0882 mean?
P0882 means the transmission control module has detected that its supply voltage is lower than expected, which can prevent it from operating the transmission correctly. The standard definition is "TCM Power Input Signal Low."
Can I drive with a P0882 code?
Use caution. Many vehicles enter limp mode with this code, and a weak charging system may also leave you stranded, so check the battery and charging system right away.
Can a dead battery set P0882?
Yes. A low battery, jump start, or extended cranking can drop TCM voltage enough to set the code, so test the battery before replacing any transmission parts.
Will P0882 clear itself after a battery replacement?
It may clear after the module sees normal voltage over several drive cycles, but clearing it with a scan tool and confirming with a road test is the reliable approach.
Keep researching
More transmission codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.