Fuel consumption signal wire chafed or shorted to earth between the engine control unit and the instrument cluster; Damaged or corroded connector or terminals at the engine control unit or cluster plug; Wiring damage in a harness grommet or bulkhead pass-through area; Fault inside the instrument cluster pulling the signal line to earth; Internal fault in the engine control unit output stage; Water ingress or previous repair damage affecting the harness.

P1253

Fuel Consumption Signal Short To Ground.

Volkswagen
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
2: AreaFuel and air metering (injector circuit)
53: FaultThe specific fault in that area

What it means

On Volkswagen group vehicles, P1253 means the engine control unit has detected the fuel consumption signal line shorted to earth. This signal is sent from the engine control unit to the instrument cluster or multi-function display to calculate fuel use and range. The control unit sees the output line pulled to ground instead of switching as expected, so it stores the fault. It usually affects the trip computer rather than how the engine runs.

Symptoms

Engine warning light on or a stored fault with no driveability change
Fuel consumption or range readout in the dash shows zero, dashes or erratic values
Trip computer average consumption not updating
Instantaneous consumption display frozen or incorrect
Occasionally other cluster functions behaving oddly, depending on the model

Possible causes

Fuel consumption signal wire chafed or shorted to earth between the engine control unit and the instrument clusterlikely
Damaged or corroded connector or terminals at the engine control unit or cluster pluglikely
Wiring damage in a harness grommet or bulkhead pass-through areapossible
Fault inside the instrument cluster pulling the signal line to earthpossible
Internal fault in the engine control unit output stagerare
Water ingress or previous repair damage affecting the harnessrare

How to diagnose

Read all stored codes and freeze frame data, note whether the fault is current or intermittent, then clear and see if it returns
Check the dash consumption display and compare with other cluster functions to confirm the symptom
Inspect the engine control unit and cluster connectors for corrosion, bent pins, moisture or loose terminals
Look over the harness for chafing, trapped wiring or past repair damage, especially near the bulkhead and engine bay routing
Using the model-specific wiring diagram, identify the fuel consumption signal wire, as routing and pin numbers vary by model and engine
With both connectors unplugged and the battery disconnected, test the signal wire for continuity to earth
If the wire is clear, check the signal at the control unit and cluster to decide which unit is at fault
Check for related cluster or control unit faults and any applicable manufacturer service information

How to fix

Repair or replace the shorted section of wiring and secure it clear of sharp edges
Clean, repair or replace corroded or damaged connectors and terminals
Replace or repair the damaged harness section if the damage is extensive
Repair or replace the instrument cluster if testing shows it is holding the line to earth
Replace or repair the engine control unit only after wiring and cluster faults are ruled out, with any coding required by the manufacturer

Can I keep driving?

Low severity

The car can normally be driven as the fault mainly affects the consumption display. Book it in for diagnosis soon, and stop if other warning lights or driveability problems appear.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.