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P0882 Severity
Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.
For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.
Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.
If the Transmission Control Module (TCM) does not receive the correct amount of voltage, it will send a message to the engine control module (PCM) to set code P0882.
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Code P0882 stands for TCM Power Input Low
The transmission control module (TCM) is the onboard computer that governs your vehicle’s transmission. Sometimes the transmission control module is built into the powertrain control module (PCM) and other times it’s a standalone unit.
Powertrain Control Module
Like any other computer, the TCM receives inputs from peripheral devices, such as sensors and switches. The TCM then uses this information to control various outputs, such as the shift solenoids and torque converter clutch solenoid. It’s through operation of these output devices that the TCM controls transmission operation.
Like any other electronic device, the TCM must have proper power and ground. Code P0882 indicates there isn’t enough power getting to the transmission module. This is usually due to a problem with the power input circuit. The ‘low’ portion of the diagnostic trouble code (DTC) indicates a short circuit, whereas ‘high’ would indicate and open circuit.
Get it diagnosed by a professional
Code P0882 is typically caused by one of the following:
Sometimes P0882 can pop up intermittently, or it can result from a dead battery. Clear the code and see if it returns. If it does, the next step is to perform a visual inspection. A trained eye can check for issues such as broken wires and loose connections. If a problem is found, the issue should be repaired and the code cleared. If nothing is discovered, check for technical service bulletins (TSBs). TSBs are recommended diagnostic and repair procedures put out by the vehicle manufacturer. Finding a related TSB can greatly reduce diagnostic time.
Before proceeding, the vehicle should be checked for related DTCs. This could help speed up the diagnostic process. On example is a Chrysler vehicle with a DTC for the totally integrated power module (basically a smart fuse box). Such a code could pinpoint a problem with that module, and not the TCM power input circuit.
The next thing a professional will do is check the battery. There won’t be enough voltage getting to the TCM is the battery isn’t up to snuff. The battery should be charged or replaced as needed and the code cleared.
A relay is used to supply power to the TCM. Since relays are usually easy to access and test, this is the next step. Relay function can be tested by swapping the relay with another known good relay from the vehicle. Other ways to check the relay include testing it with a digital multimeter (DMM) and using jumper wires in its place.
Like relays, fuses are easy to check. A blown fuse will prevent power from reaching the TCM. Fuses can be inspected visually, to see if their filament is blown. They can also be checked with a DMM or test light.
The next step is to check the TCM circuit for problems. This is usually done using a DMM at the TCM connector. Since the code is for signal low, short circuits should be checked first. If a problem is found, the factory wiring diagram will need to be traced to pinpoint the concern. Then, the issue can be repaired and the code cleared.
If everything checks out, there may be a problem with the TCM. It may be detecting a low input power condition when there really isn’t one. At this point, the TCM would either need to be replaced or reprogrammed.
P0882 is monitored when the vehicle ignition is turned from the “OFF” to the “RUN” position and/or when the ignition it turned from the “START” to “RUN” position.