P0882: The transmission computer's power input voltage is too low
TCM power input signal low
Severity: Inspect soon
Kelley Blue Book rates P0882 extremely serious and advises against driving long with it, so it should be inspected soon.
It gets more serious if:
- Stop: Stop driving and have the car towed if the engine stalls or the transmission will not shift. Kelley Blue Book warns of erratic behavior at speed and permanent transmission damage.
P0882 in short
P0882 means the transmission control module is getting too little voltage on its power input. A weak battery or alternator, corroded wiring or connectors, or a blown fuse or fusible link are the usual causes. Kelley Blue Book advises against driving long with it, so have it checked soon.
The transmission control module (TCM) checks its supply voltage when the engine starts. If the voltage is too low, P0882 is set. The fault is in the supply, not necessarily in the module.
Both references start with the battery and charging system. Kelley Blue Book lists low battery charge, a bad battery, an alternator fault, faulty TCM wiring, and blown or corroded fuses and fusible links. TroubleCodes.net lists corroded wiring, bent connector pins, a weak battery and a short to ground.
Symptoms are a check engine light and shifting trouble, from minor to being stuck in one gear. Kelley Blue Book rates the code extremely serious and also lists stalling and a speedometer fault; TroubleCodes.net rates it moderate to serious and mentions limp mode.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Weak battery or charging system fault
Common general cause- Why it ranks here
- Both references list the battery first and name the alternator as a cause; TroubleCodes.net says to test battery voltage first.
- What would change this
- Rises if battery voltage is low at rest or alternator output is not about 14 volts running. Falls if both are normal.
Cause 2: Corroded or damaged wiring, connector pins, fuses or fusible links
Common general cause- Why it ranks here
- Both references list wiring and connector faults, and Kelley Blue Book adds blown or corroded fuses and fusible links.
- What would change this
- Rises if connectors are corroded or bent or a fuse or link is open. Falls if the circuit tests good.
Cause 3: TCM or engine computer fault
Possible — needs testing- Why it ranks here
- TroubleCodes.net lists a malfunctioning computer as less common; it comes after the power supply.
- What would change this
- Rises if the supply tests good and the code returns. Falls if a supply fault is found.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Read all stored codes and note any other low-voltage or network codes.
IfSeveral modules report low voltage
It meansSuspect the battery or charging system.
IfOnly P0882 is stored
It meansStart with the battery anyway.
Step 2: Test the battery voltage and condition, and check that the alternator makes about 14 volts with the engine running.
Warning:Keep hands and tools clear of the belt and fan with the engine running, and do not short the battery terminals.
IfBattery or charging is out of range
It meansRepair that first.
IfBoth normal
It meansHave the TCM power wiring tested.
Step 3: Have a shop inspect the TCM connectors for corrosion, moisture and bent pins, and check the fuses, fusible links and wiring for breaks or shorts to ground.
Warning:Probing live control module connectors can short pins and damage the module; leave this to a shop.
IfCorrosion, a bad fuse or a wiring fault is found
It meansRepair it.
Points to: Corroded or damaged wiring, connector pins, fuses or fusible links
IfEverything tests good
It meansThe module is suspect.
Symptoms
- Check engine light
- Shifting trouble or stuck in one gear Gets more serious: stop and have it checked.
- Engine stalling Gets more serious: stop and have it checked.
- Speedometer not working
How to fix
Step 1: Have the battery and charging system tested, and clean or repair any corroded TCM connector or power wiring.
On your vehicle
We don't have reviewed vehicle-specific evidence for P0882 yet. The causes and tests above apply across vehicles.
Related codes
P0882 questions
Can a weak battery cause P0882?
Yes. Both Kelley Blue Book and TroubleCodes.net list a weak or failing battery, so test the battery and alternator first.
Sources and review
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error