P0882 - TCM Power Input Signal Low
The P0882 code indicates that the Transmission Control Module (TCM) has detected a low voltage condition on its power input circuit. This can be caused by a weak battery, faulty alternator, poor electrical connections, or a failing TCM. The TCM requires a stable voltage supply to operate correctly; low voltage can lead to erratic transmission behavior or failure to shift.
01. Most Common Causes
- Weak or discharged battery
- Faulty alternator not charging properly
- Corroded or loose battery terminals or ground connections
- Damaged wiring or connectors in the TCM power circuit
- Faulty TCM (internal short or failure)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission shifting erratically or stuck in gear
- Reduced fuel economy
- Transmission may go into limp mode
- Engine may not start or have difficulty starting
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for other related codes.
Step 2: Inspect battery voltage at rest (should be ~12.6V) and while running (should be ~13.5-14.5V).
Step 3: Check battery terminals and ground connections for corrosion or looseness; clean and tighten as needed.
Step 4: Inspect the TCM power supply fuse and relay; replace if blown.
Step 5: Test the TCM power input circuit for voltage drop; repair any damaged wiring or connectors.
Step 6: If all else is fine, suspect a faulty TCM and consider replacement or reprogramming.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as low voltage can cause unpredictable transmission behavior, potentially leading to a dangerous situation or further damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and simple repairs like cleaning terminals or replacing a fuse. If the TCM needs replacement, costs can exceed $500.