P35B0

Cylinder 2 Injector Circuit Low

P35B0 is a generic OBD-II powertrain diagnostic trouble code: Cylinder 2 Injector Circuit Low. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P35B0
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
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What P35B0 means

P35B0 is set when the engine control module detects a low voltage or current condition on the fuel injector control circuit for cylinder 2. The ECM continuously monitors the injector driver feedback line, and a reading that falls below the calibrated lower limit for the expected duration causes this code to be logged.

Common triggers include a wiring short to ground between the ECM and the cylinder 2 injector, a failed injector solenoid with abnormally low resistance, or a degraded ECM injector driver. The fault causes disrupted or absent fueling on cylinder 2, which typically produces a rough idle, a power loss, and a stored misfire code alongside P35B0.

Technicians should perform a thorough visual inspection of the harness and connector before electrical testing. Measuring solenoid resistance and performing a continuity check on the signal wire will differentiate between a component fault and a wiring fault. Live data review of fuel trims helps assess the degree of cylinder imbalance caused by the defective circuit.

Common causes

Most-frequently reported root causes when P35B0 is logged.

  • 1
    Short circuit to ground in the cylinder 2 injector signal wire.
  • 2
    Injector solenoid winding failure resulting in low resistance.
  • 3
    Corroded or spread terminals at the injector electrical connector.
  • 4
    Damaged wiring insulation caused by heat or mechanical abrasion.
  • 5
    Failed ECM internal injector driver for cylinder 2.
  • 6
    Improper injector installation or use of a wrong-impedance part.
  • 7
    Water or fluid intrusion causing a tracking short in the connector.

Symptoms drivers notice

MIL on with cylinder 2 injector low or misfire code present.
Engine misfire or rough running, especially at idle and light load.
Noticeable drop in power output on affected cylinder.
Possible fuel odour from catalytic converter overload.
Long-term fuel trim skewed lean or rich depending on ECM compensation.

How to diagnose P35B0

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs with a scan tool and document freeze frame conditions.
  2. 2
    Inspect cylinder 2 injector wiring harness and connector for damage or corrosion.
  3. 3
    Measure injector solenoid resistance and verify it meets the manufacturer range.
  4. 4
    Perform a continuity and short-to-ground test on the injector control wire.
  5. 5
    Use live data to observe cylinder 2 injection pulse width and fuel trim corrections.
  6. 6
    Substitute the cylinder 2 injector with a verified good unit and retest.
  7. 7
    If injector and wiring pass all tests, evaluate the ECM driver output with a scope or noid light.

Related powertrain codes

Frequently asked questions

Is P35B0 the same fault as P35AF but on a different cylinder?

Yes, both describe a low-circuit condition on a specific cylinder injector; P35AF targets cylinder 1 and P35B0 targets cylinder 2. Diagnosis procedure is essentially identical.

Can a fuel-fouled injector cause P35B0?

Mechanical fouling alone does not lower circuit voltage enough to set this code. P35B0 is an electrical fault; a mechanically stuck injector would more likely set a performance or contribution code.

Should I clear the code before testing?

No. Record freeze frame data first, then diagnose. Clearing codes prematurely can lose valuable information about operating conditions when the fault occurred.

What resistance range is typical for a high-impedance injector?

High-impedance injectors generally measure between 12 and 17 ohms. Low-impedance peak-and-hold injectors typically read 2 to 5 ohms. Always verify against the specific vehicle service data.

Disabling P35B0 in software

RaceTune can permanently disable P35B0 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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