P2C54

Code

Generic P — Powertrain

Cylinder 2 Fuel Injector B Offset Learning At Min Limit

Brand: Generic

Type: P — Powertrain

Views: UK: 28 EN: 42 RU: 20

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Page language: EN

Causes

Faulty fuel injector (cylinder 2) — low flow or stuck closed
Open, shorted, or high-resistance wiring/connector to injector 2
Poor power (12 V) supply or ground to injector circuit
Contaminated or clogged injector
Low fuel pressure or fuel supply restriction
Faulty injector driver inside the PCM/module

Symptoms

Check Engine Light (MIL) illuminated with P2C54 stored
Rough idle or hesitation, especially at idle or light load
Reduced engine performance or drivability complaints
Possible misfire on cylinder 2 (may set P0302)
Failed emissions test or high tailpipe HC/CO readings
Possible hard start or increased cranking time

What to check

Scan tool: read P2C54 plus freeze frame and pending codes; check current injector offset/adaptation values
Visual inspection of injector 2 connector, wiring, and engine harness for damage, corrosion, pin push-out, melted insulation or poor pin contact
Measure battery voltage and ground integrity with engine off and cranking
Measure injector resistance at harness connector and compare to specification
Use a NOID lamp or oscilloscope to verify injector pulse and driver waveform while cranking/idle
Perform injector balance (cylinder drop) or current draw test to compare flow of cylinder 2 to other cylinders

Signal parameters

Injector supply voltage: ~12 V (key on); verify near battery voltage
Injector resistance (typical range varies by vehicle): commonly 2–16 Ω (measure and compare to OEM spec)
Injector pulse width at idle: generally ~1.5–4.0 ms depending on engine and load
Injector driver current draw during pulse (varies by injector type) — use current probe or manufacturer data
Adaptation/offset learning value: nominal near 0; fault occurs when value reaches programmed minimum limit (negative saturation)

Diagnostic algorithm

Retrieve codes and freeze-frame data; record injector offset/adaptation values and any misfire data.
Visually inspect cylinder 2 injector connector and wiring for corrosion, bent pins, water ingress, melted insulation or chafing. Repair any damage.
Check battery voltage and engine ground connections. Recharge or repair charging system if voltage low.
With connector disconnected, measure injector resistance and compare to spec. If out of range, replace injector.
With a NOID light or scope, verify injector receives correct pulse when cranking/running. If no pulse, check driver output and related fuses/relays.
Perform an injector balance or cylinder drop test to compare flow contribution of cylinder 2 against others. Low contribution indicates mechanical flow problem or low fuel pressure.

Likely causes

Injector electrical fault (open/high resistance) or intermittent connector
Injector mechanically restricted or partially clogged causing low flow
Low fuel rail pressure reducing injection volume leading to compensating offset
Damaged PCM injector driver causing incorrect current/pulse width
Battery/charging system low voltage during learn causing incorrect values

Fault status

⚠️ Status

Cylinder 2 Fuel Injector B offset adaptation is at minimum limit. Inspect injector, harness, fuel supply, and perform injector/circuit tests; complete relearn after repair.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours