P0892

TCM Power Relay Sense Circuit Intermittent

Severity: High
Driving: Drive only to a garage

The power relay sense circuit is faulting intermittently. The transmission works, then briefly does not, then works again. Relay and socket problems behave exactly like this as the contacts wear, and so do corroded connections in a damp fuse box.

Possible causes

CommonWorn relay with intermittent contacts
CommonCorroded relay socket
CommonWater ingress into the fuse box
PossibleLoose or chafed sense wiring
PossibleWeak battery causing marginal relay operation

What you might notice

Occasional limp mode that clears after a restart
Transmission occasionally dead at start-up
Fault linked to wet weather
Check engine light coming and going

What to check, in order

Note whether it happens in the wet. Water in the fuse box is a very common cause of intermittent relay faults and is easily missed.
Swap the relay and see whether the fault follows it.
Inspect the socket for corrosion.
Check battery voltage and state of charge - a weak battery makes a marginal relay behave intermittently.
Wiggle-test the fuse box connections with the engine running.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

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Where this code sits

B · Body C · Chassis P · Powertrain U · Network and communication