P0804

1-4 Upshift (Skip Shift) Lamp Control Circuit

Severity: Low
Driving: No driving restriction

A fault in the control circuit for the skip shift indicator lamp - the lamp that tells the driver the transmission is asking for a 1-4 upshift. The skip shift function itself may be working perfectly; what has failed is the circuit that lights the lamp.

Possible causes

CommonBlown indicator bulb, on vehicles with a bulb rather than an LED cluster
CommonWiring or connector fault to the lamp
PossibleFailed instrument cluster lamp driver
PossibleCorroded connector behind the cluster
RareFailed control module output

What you might notice

Skip shift lamp not lighting
Skip shift lamp permanently on
Check engine light on
No effect on how the car drives

What to check, in order

Check whether the lamp lights during the ignition-on bulb check. If it never lights there, start with the bulb or the cluster.
Check the wiring between the module and the cluster.
Confirm the skip shift function itself still works before spending anything - this code concerns the lamp only.
Check for P0803 stored alongside, which would point at the solenoid circuit instead.

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.

Get Pin16 on Google Play

Where this code sits

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