P0884

TCM Power Input Signal Intermittent

Q: Is it safe to drive with P0884?

Short trips may be fine, but an intermittent power feed can put the transmission into limp mode without warning. Get the power and ground connections checked soon.

Q: Can I just clear P0884?

It will return whenever the power feed glitches again. Fix the loose connection, relay, or ground rather than just clearing it.

Transmission control power supply Generic OBD-II Medium

What it means

P0884 means the transmission control module (TCM) is seeing an intermittent power-input signal — its supply voltage is cutting in and out rather than staying steady. The engine still starts and runs (the ECM has its own supply), but when the TCM loses power it can shift erratically or drop into limp mode. The usual causes are a loose or corroded power/ground connection, a flaky relay, or a weak charging system.

Medium

Can I keep driving? The engine starts, but an unstable power feed can drop the transmission into limp mode or cause erratic shifts — fix it before it strands you.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on (may be intermittent)
Erratic or missed shifts
Transmission drops into limp mode
Other transmission-related codes may be stored alongside it

Common causes

Most likely first

Loose or corroded connections in the TCM power feedLikely
Failed or intermittent TCM power relayCommon
Poor TCM ground connectionCommon
Weak battery or failing alternator causing voltage dipsLess often
Failed transmission control module (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and note whether the fault tracks with vibration or voltage changes.
Test battery and charging-system voltage under load to rule out supply problems.
Inspect and clean the TCM power and ground connections; wiggle-test for dropouts.
Check the TCM power relay and its control circuit; replace if it's intermittent.
Repair the loose/corroded feed, then clear the code and road-test.

FAQ

Quick answers

Is it safe to drive with P0884?+

Short trips may be fine, but an intermittent power feed can put the transmission into limp mode without warning. Get the power and ground connections checked soon.

Can I just clear P0884?+

It will return whenever the power feed glitches again. Fix the loose connection, relay, or ground rather than just clearing it.

Read & clear P0884 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX