P0882Generic code

P0882 Code: TCM Power Input Signal Low

The P0882 code means the control circuit that powers the transmission control module (TCM) shows low voltage, from a short to ground or a missing supply. It can cause limp mode or erratic shifting. A shorted control wire or an interrupted supply is the usual cause.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$10 to $400
Difficulty
Medium
System
Transmission
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0882 code means

The transmission computer needs a stable power supply. Some vehicles feed it through a relay that the module itself controls, and others feed it straight from the fuse box. The module monitors its own supply voltage.

The computer watches the control circuit from its own driver transistor. The P0882 code indicates low voltage in the control circuit (a short to ground or a missing supply). Before replacing the component, check the fuse, relay, connector and wiring, since they are the most common cause.

With low or unstable voltage, the transmission shifts erratically or goes into limp mode, and solenoid codes can show up even though the solenoids are fine. Check the battery, alternator, fuses and grounds before anything else.

To confirm the diagnosis, unplug the component with the key on and watch what happens to the scan tool reading or to the code. If the value jumps to the opposite extreme, the wiring is fine and the component is the part pulling the signal to ground. If nothing changes, look for the short in the wire, starting where the harness rubs against the engine, the chassis or the exhaust.

P0882 code symptoms

  • Check engine light or another warning light on.
  • Transmission in limp mode or shifting erratically.
  • Erratic shifts.
  • Limp mode.
  • Several transmission codes at the same time.

Likely causes of the P0882 code

  1. Control wire shorted to ground. The component may stay on all the time, or the computer cuts the command to protect itself.
  2. Interrupted supply: a blown fuse, a bad relay or a cut wire.
  3. Shorted component, with a resistance much lower than specified.
  4. Connector with moisture, which creates a path to ground.

How to diagnose the P0882 code step by step

  1. Activate the component with the scan tool and see whether it responds.
  2. Check the fuse and relay. Measure voltage on both sides of the fuse, and swap the relay with an identical one.
  3. Measure the supply at the connector: battery voltage with the key on or when the component is activated.
  4. Measure the component resistance and compare it with the manual, and also the insulation to ground.
  5. Check the control wire for continuity to the computer and for the absence of shorts.
  6. Measure battery and charging voltage.
  7. Measure the voltage drop on the module grounds, which should be under 0.2 V.

How to fix the P0882 code

  • Repair the connector, the wiring or the power supply.
  • Replace the transmission computer power supply component if it does not respond with correct power and control.
  • Clear the codes and verify.

Technical reference data

  • Supply voltage: battery voltage (13.5 to 14.7 V with the engine running).
  • Reference values are only a guide, so look up the manufacturer data for your vehicle.
  • Ground voltage drop under load: below 0.2 V.

Brand-specific notes

If a P0882 code shows up together with other transmission codes, suspect the power supply and grounds before you suspect the individual parts, since a weak supply makes healthy solenoids look bad.

P0882 on Chrysler

On many Chrysler vehicles the transmission relay is in the fuse box in the engine compartment.

P0882 on Ford

On many Ford vehicles the transmission relay is in the fuse box in the engine compartment.

Frequently asked questions about P0882

Can I drive with a P0882 code?
Yes, with caution. The transmission may shift erratically or drop into limp mode, so get it checked before long trips.
What does the transmission computer power supply do?
The transmission computer needs a stable supply. Some vehicles feed it through a relay it controls, and others straight from the fuse box. The module monitors its own supply voltage.
Does the part always have to be replaced?
No. Check the fuses, relays, connectors and wiring first.
How much does it cost to fix P0882?
Roughly $10 to $400, from a fuse or relay up to a wiring repair or a new part.
What does the P0882 code mean?
It is a generic OBD2 code that means the control circuit that powers the transmission control module shows low voltage, from a short to ground or a missing supply.

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