P0882 — TCM Power Input Signal Low

P0882 — TCM Power Input Signal Low. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P0882 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the TCM power input for damage, corrosion, chafing or poor contact.
Subsystem check Check for supply voltage at the TCM power input connector first; then measure resistance from the signal wire to ground — near-zero ohms confirms a short to ground in the harness.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P0882 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P0882 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Replace the faulty sensor or actuator: $150–$500; Repair wiring or connectors: $80–$250. Overall, fixing P0882 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What is the most common cause of P0882?

The most common causes are: poor ground connection, corroded, loose or damaged connector, blown fuse feeding the circuit.

How do I diagnose P0882 myself?

Start with a scan: confirm P0882, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the TCM power input, and verify the suspect component against live data before buying parts.

What are the symptoms of P0882?

Drivers most often notice: increased fuel consumption in some cases, the affected system operates intermittently or not at all, Check Engine Light on, possible limp mode depending on the affected component.

Is it safe to drive with P0882?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How much does it cost to fix P0882?

Control module repair — $300–$1,000; Replace the faulty sensor or actuator — $150–$500; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

When the Transmission Control Module (TCM) loses its proper supply voltage, the engine computer logs trouble code P0882. This code belongs to the powertrain family — it deals with anything touching the engine or transmission control systems. The full technical description reads "TCM Power Input Signal Low," which tells you exactly where the problem lives: the power feed going into the transmission computer.

The TCM manages gear shifting, line pressure, and torque converter clutch operation on automatic transmissions. It needs a clean, stable voltage source to function correctly. When that voltage drops below the minimum threshold the module expects — hovering near ground potential instead of the normal 5 or 12 volts — P0882 triggers. Several things can cause this: a direct short to ground somewhere in the wiring, insulation worn through so bare wire touches metal, a complete loss of power to the circuit, or an internal component failure inside the TCM itself dragging the signal down. The ECU monitors this condition continuously and typically requires the fault to appear across multiple drive cycles before officially setting the code and illuminating the Check Engine Light.

Once P0882 activates, the ECU saves a freeze frame snapshot — engine RPM, load percentage, coolant temperature, and vehicle speed recorded at the exact moment the failure occurred. That snapshot becomes your roadmap for recreation and verification during diagnosis.

Symptoms of P0882

Persistent or intermittent Check Engine Light illumination
Noticeable increase in fuel consumption compared to normal driving
Transmission may shift roughly, hesitate, or fail to shift entirely
Reduced or complete loss of automatic transmission functionality
Vehicle enters limp mode with limited gears available
Stalling or failure to start in severe cases

Common Causes of P0882

Faulty TCM internal power circuit drawing the signal low
Blown fuse or fusible link feeding the TCM power circuit
Signal wire shorted to ground due to chafed or melted insulation
Broken or corroded connector at the TCM or related component
Open circuit or damaged wiring interrupting voltage supply
Poor ground connection at the TCM causing erratic voltage
Missing supply voltage from the main relay or power distribution center

How to Diagnose P0882

Plug in an OBD2 scanner and confirm P0882 is stored. Record the associated freeze frame data before clearing anything — this tells you engine conditions when the fault happened.
Scan for any other trouble codes. Related codes often point toward the true root cause, whether upstream or downstream in the same circuit. Check manufacturer technical service bulletins for your specific make and model using your VIN on the automaker's site or nhtsa.gov.
Visually inspect the TCM connector and the full wiring harness route. Look for damaged insulation, corrosion at terminals, pins pushed out of position, or wires rubbing against heat shields or sharp edges.
Test for supply voltage at the TCM power input connector first. Then check resistance from the signal wire to ground — a reading near zero ohms confirms a direct short to ground somewhere in the harness.
Verify reference voltage, ground integrity, and signal continuity at the component harness. Measure actual voltage drop under load when the system is powered up.
Perform a wiggle test on the harness while monitoring live data. Any signal dropouts or interruptions point to broken strands inside the wire or intermittent connector contact.
Clear the code and complete a full drive cycle that recreates the freeze frame conditions. If P0882 returns, the fault is confirmed and present.

Repair Options for P0882

Depending on what the diagnosis uncovers:

Control module repair or replacement: $300–$1,000
Replace failed sensor or actuator in the circuit: $150–$500
Repair damaged wiring, connectors, or grounds: $80–$250

How Much Does It Cost to Fix P0882?

Prices vary based on which part actually failed. Parts and labor estimates at independent shops in USD:

Repair Type	Cost Range
Control module repair/replacement	$300–$1,000
Sensor or actuator replacement	$150–$500
Wiring or connector repair	$80–$250

Most shops bill $75–$125 per hour for diagnostic work. Expect to pay a one-hour diagnosis fee on top of any parts and labor for the actual fix. A thorough diagnosis before purchasing components saves money — the most expensive repair scenario is almost never the first place to look.

Can You Drive with P0882?

The severity level for P0882 is short — in most cases the vehicle remains drivable, though you may notice poor acceleration, harsh shifting, or reduced fuel economy. Limp mode often activates to protect the transmission, limiting you to second gear or reverse only. If the car stalls, fails to start, or displays brake and steering warnings alongside this code, treat it as urgent and have it towed rather than risk being stranded.