Injector Circuit Low (Bank 1)
Low voltage detected in the injector circuit of Bank 1.
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What it means (plain English)
The computer is sensing that the voltage in the injector circuit for Bank 1 is below normal levels, which may prevent proper fuel delivery.
What the computer is actually seeing
The engine control module (ECM) monitors the voltage levels of the injector circuit. A reading below 5 volts indicates a problem, which typically happens when the circuit is shorted to ground or there's an open in the wiring.
What a healthy reading looks like
Injector circuit voltage should be between 5-12 volts when the engine is running.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring to the injector for visible damage or corrosion.
- 22. Inspect the connector at the injector for loose pins or corrosion. Fix any issues found. Decision point: If wiring/connectors are good, proceed to step 3.
- 33. Measure voltage at the injector connector while cranking the engine. Expected voltage is between 5-12 volts. Decision point: If voltage is low, check for short/open in the wiring. If voltage is good, proceed to step 4.
- 44. Check the injector resistance with a multimeter. Expected resistance is typically around 12-16 ohms. Decision point: If the resistance is out of spec, replace the injector. If in spec, replace the ECM or further diagnose injector driver.
Common causes
- Wiring short to ground
- Open circuit in the wiring harness
- Failed injector driver within the ECM
- Corroded or loose connector at the injector
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as this can affect engine performance and fuel efficiency.
Will this code come back after clearing?
It may return if the underlying issue isn't fixed.
Why does this code sometimes pair with P1260?
P1260 indicates a similar issue with injector circuits; both involve low voltage detection in the fuel delivery system.
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