Exhaust Aftertreatment Fuel Injector Circuit High (Generic)
The P4058 code means the vehicle's onboard diagnostic system has detected: Exhaust Aftertreatment Fuel Injector Circuit High (Generic). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $600 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Excessive fuel in exhaust during regen
- DPF overheating concern
- Strong diesel smell from exhaust
- Oil dilution from excess fuel
Probable Causes (Ranked by Likelihood)
- Short to voltage in injector circuit Very High
- Injector stuck open High
- Wiring shorted to power wire Moderate
- PCM driver outputting too much current Low
Step-by-Step Diagnostic Procedure
-
Check injector signal with scan tool
-
Disconnect injector and check for stray voltage
-
Inspect wiring for shorts to power
-
Verify injector is not mechanically stuck open
Frequently Asked Questions
Can P4058 cause DPF overheating?
Yes, excess fuel in the exhaust can cause uncontrolled combustion in the DPF.
Can excess fuel dilute my engine oil?
Yes, fuel that does not combust in the DPF can wash past the piston rings into the crankcase.
Can I drive with P4058?
You can drive short distances but check your oil level and smell it for fuel contamination.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.