P01E0: Cylinder 11 Injection Timing Performance - Over Advanced

Diesel engines must detect when fuel can no longer be injected at the correct crank angle – CARB requires this for every injector individually, hence one code per cylinder. The start of injection is not measured directly: during overrun with fuel cut-off the control module fires a tiny test injection into one cylinder (GM: about 1.5 mm³) and evaluates the resulting speed change at the crankshaft sensor. From this it learns how much extra energizing time the injector needs (Bosch calls this zero fuel calibration). This code means injector 11 needs clearly less energizing time than intended, i.e. it opens too early or delivers too much – GM sets it below −90 µs, after two trips. No manufacturer document using the codes for cylinders 9–12 was found; the description follows CARB's requirement and the documented measuring principle (Bosch patent, GM tables for cylinders 1–8). Such codes can only appear on engines with at least that many cylinders.

Cylinder 11 is numbered according to the manufacturer: check your engine's manual before working on it.

Symptoms

• Check engine light on (after two drive cycles)
• Louder combustion noise or knocking
• Rough idle
• Possibly smoke

Most likely causes

• Injector worn or leaking (delivers too much in small quantities)
• False setting from software or vehicle vibration (e.g. off-road tyres)
• Wrong injector correction code stored after an injector replacement
• Boost leak or loose injector clamp
• Contaminated fuel

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and wiring of the injector indicated
2. Compare the reading with other engine data while varying the engine speed.
3. Measure the resistance and compare it with the manufacturer's specification
4. Check the control signal with an oscilloscope; on direct injection or diesel engines, leave this to a repair shop because of the high voltages
5. On diesels, check the per-cylinder injection corrections

Good to know

• Repair difficulty: hard
• It affects emissions.

What each character of P01E0 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 1: Air and fuel
• E0: Specific fault in that system

Frequently asked questions

Can I keep driving with code P01E0?

Drive as little as possible and go to a repair shop. If you smell fuel or the engine is shaking badly, do not keep driving.

What causes code P01E0?

The most common causes are: injector worn or leaking (delivers too much in small quantities); false setting from software or vehicle vibration (e.g. off-road tyres); wrong injector correction code stored after an injector replacement.

Related codes

• P01DFCylinder 11 Injection Timing Performance - Over Retarded
• P0311Cylinder 11 Misfire Detected
• P2B11Cylinder 1 Injection Pulse Offset Exceeded Learning Limit
• P01DECylinder 10 Injection Timing Performance - Over Advanced
• P01E2Cylinder 12 Injection Timing Performance - Over Advanced

Sources

• law.cornell.edu: 13 CCR 1968.2
• patents.google.com: US9109561
• gsi.ext.gm.com: 18OBDG04 Engine Diagnostics

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.