Injector Circuit Low - Cylinder 7
The P0281 code means the vehicle's onboard diagnostic system has detected: Injector Circuit Low - Cylinder 7. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $150 - $600 (parts and labor)
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Common Symptoms
- Check Engine Light illuminated
- Cylinder 7 misfire
- Rough idle
- Possible over-fueling on cylinder 7
Probable Causes (Ranked by Likelihood)
- Short to ground in cylinder 7 injector wiring Very High
- Internally shorted cylinder 7 injector High
- Fuel-contaminated connector Moderate
- PCM driver shorted Low
Step-by-Step Diagnostic Procedure
-
Measure injector resistance. Below spec indicates short.
-
Disconnect injector and check for short to ground in wiring.
-
Inspect connector for fuel contamination.
-
Compare to other cylinder injector resistance values.
Frequently Asked Questions
What causes a short in an injector circuit?
Wiring that has chafed against the engine or intake manifold, fuel leaks degrading wire insulation, or an internal injector coil short.
Can fuel contaminate the connector?
Yes, a leaking fuel injector O-ring can allow fuel to seep into the electrical connector, causing a conductive path to ground.
Should I replace the injector or wiring first?
Measure injector resistance first. If it is within spec, the wiring is the problem. If it is out of spec, replace the injector.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0281 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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