The injector supply circuit for one group of injectors is open. Expect a serious misfire or a dead bank.
P2146 — also written P2146, P 2146, 2146 — is the OBD-II code for fuel injector group 'a' supply voltage circuit open. Same code, same fix: this page covers every spelling of it.
P2146 is a fuel & air fault code, typically costing £90–£900 to put right in a UK garage.
What causes P2146?
- Blown injector fuse
- Broken supply wire or connector
- Failed ECU injector driver
- Water in the injector loom
How P2146 is fixed
- Check the injector fuse and supply voltage at each injector plug
- Repair the loom
- ECU repair if a driver has failed
P2146 repair cost in the UK
Most P2146 repairs land between £90–£900 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2146?
No. Running on a dead bank damages the catalytic converter quickly.
Urgency: high.