P0262: Cylinder 1 fuel injector circuit reads high voltage
Injector 1 circuit high / cylinder 1 injector circuit high
Severity: Severity not verified — if the car runs badly, have it inspected
No source here rates the urgency of an injector circuit fault, so the class is not verified. One cylinder may not get fuel correctly, so the engine can run rough or lose power.
It gets more serious if:
- Inspect soon: Inspect soon if the engine misfires, runs rough, loses power or stalls.
P0262 in short
P0262 means the engine computer found the cylinder 1 fuel injector circuit reading high voltage. TroubleCodes.net lists a wiring short to positive, a faulty injector or the engine computer as the causes. If the engine runs rough or loses power, have it checked soon.
The computer drives each fuel injector through its own circuit and watches the voltage on it. P0262 is the code for cylinder 1: the voltage stayed higher than the computer expects.
TroubleCodes.net gives three possible causes: a wire shorted to positive voltage, the injector itself, or the engine control module. The page gives no ranking beyond that order.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Wiring short to positive in the injector circuit
Common general cause- Why it ranks here
- TroubleCodes.net lists a wiring short to positive first.
- What would change this
- Rises if the harness is chafed or the connector is damaged or wet. Falls if the wiring tests good.
Cause 2: Faulty injector on cylinder 1
Common general cause- Why it ranks here
- Listed second by TroubleCodes.net.
- What would change this
- Rises if the injector reading is out of range. Falls if it tests like the others.
Cause 3: Engine control module
Possible — needs testing- Why it ranks here
- Listed last; check only after wiring and injector pass.
- What would change this
- Rises if wiring and injector both test good. Falls if either is faulty.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: With the engine off, look at the cylinder 1 injector connector and wiring for chafing, damage or corrosion.
IfDamage or corrosion is found
It meansRepair the wiring or connector first.
IfThe wiring looks sound
It meansHave the injector and its circuit tested.
Step 2: Have the injector coil and its circuit voltage checked with a meter or a scan tool that can command the injector.
Warning:Injector circuits can carry high voltage on some engines and the fuel system is pressurised. A shop should do this.
IfThe injector reading is out of range
It meansThe injector is faulty.
IfThe injector is good but the circuit voltage is wrong
It meansWiring or the engine computer.
Symptoms
- Check engine light
- Rough running or misfire
- Loss of power or stalling Gets more serious: stop and have it checked.
Compare with: Car shaking with the check engine light on
How to fix
Step 1: With the engine off and cool, check that the injector connector for that cylinder is fully seated and free of corrosion.
Parts and cost context
- Fuel injector:Test the injector and wiring before replacing; labor varies, get a quote.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
We don't have reviewed vehicle-specific evidence for P0262 yet. The causes and tests above apply across vehicles.
Related codes
No curated relationships for P0262 yet.
Sources and review
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error