Comprehensive diagnostic guide for OBD-II code P0882

Title reference: TCM Power Input Signal Low (commonly described as "TCM power input low" or "low input supply to the TCM"). This interpretation is reflected in open-source definitions that translate to "" The code is categorized as a powertrain diagnostic code in the OBD-II framework.

1) Quick code overview

• What the code means: P0882 indicates the Transmission Control Module (TCM) is seeing a low input power signal (i.e., the TCM power/voltage supply is lower than expected). In practical terms, this often points to electrical supply issues to the TCM (power feed or ground) rather than a mechanical transmission fault alone.
• Where it sits in the system: OBD-II Powertrain Codes. These are generated by the Powertrain control systems and monitored for abnormal voltage, sensor, and communication conditions.

Important Notes

• Most probable (electrical power/ground issues):
  • Low or unstable TCM supply voltage due to battery/charging system weakness, poor alternator output under load, or excessive voltage drop in the TCM supply path.
  • Poor or corroded/loose wiring connections in the TCM power feed or main ground circuit.
  • Damaged or pinched wiring in the TCM power/ground harness, or blown fuses related to the TCM supply circuit.
  • Grounding issues at the TCM or related body/chassis grounds causing improper reference voltage.
    Estimated share (qualitative): the majority of cases in real-world practice tend to involve supply/ground irregularities.
• Moderate probability (connectors and wiring integrity):
  • Loose, corroded, or damaged connectors at the TCM (pins not fully seated, bent pins, moisture intrusion).
  • Intermediate wiring faults between the battery, fuse box, BCM/PCM, and TCM that alter voltage delivery or create intermittent signals.
    Estimated share: a meaningful minority.
• Lower probability (internal TCM fault or software):
  • Internal TCM fault (aging electronic components, intermittent short to ground, or failure of the TCM's own voltage regulation/regulator).
  • Firmware/software fault leading to misinterpretation of the power input condition (less common than wiring/power issues but possible).
    Estimated share: relatively small, but nonzero.

This diagnostic guide was generated using verified reference data:

• NHTSA Consumer Complaints: 1 real-world reports analyzed
• Wikipedia Technical Articles: OBD-II
• Open-Source OBD2 Data: N/A (MIT)

Content synthesized from these sources to provide accurate, real-world diagnostic guidance.

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