P2148

Fuel Injector Group "A" Supply Voltage Circuit High

Severity: High
Driving: Drive only to a garage

The supply voltage circuit for fuel injector group "A" is reading high - typically shorted to a higher voltage or with a lost earth reference. Injectors on that supply may be held open or driven wrongly, which can flood cylinders as well as causing a misfire.

Possible causes

CommonSupply circuit shorted to battery voltage
CommonChafed harness bridging the supply to a heavier circuit
CommonCorrosion in a connector bridging adjacent pins
PossibleOvercharging from a charging system fault
RareFailed control module driver

What you might notice

Severe misfire or rough running
Strong fuel smell
Black smoke
Engine flooding or refusing to start
Check engine light on or flashing

What to check, in order

Check charging voltage first. If the whole vehicle is being overcharged, that is the fault to fix.
Look for a short to a supply wire on the injector circuit.
Inspect the injector harness connectors for corrosion bridging pins.
Check the harness for chafe damage against the engine.
A strong fuel smell or fuel dilution of the engine oil means an injector is passing fuel continuously. Do not keep cranking it - fuel in the oil destroys bearings.

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