P2149

Code

LAND ROVER P — Powertrain

injector group B supply voltage - open circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 18 EN: 146 RU: 41

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Page language: EN

Causes

Blown fuse or failed injector power relay supplying injector group B
Open or damaged wiring in the injector supply circuit (broken wire, chafing, connector damage)
Corroded or poorly seated injector connector or harness connector
Faulty injector(s) causing internal open or short affecting the supply circuit
Poor battery/ground connection or low system voltage
Faulty ECM/PCM driver or internal connector fault

Symptoms

MIL (check engine light) illuminated
Engine misfire on cylinders in group B or overall rough idle
Reduced engine power, hesitation, or stumbling under load
Hard start or no-start condition if supply is fully absent
Stored diagnostic trouble code(s) related to injectors or misfires

What to check

Read freeze frame and live data with a capable scan tool; confirm P2149 and note which injectors are in group B
Verify battery voltage and main grounds are good
Inspect and test fuses and fuel/injector power relays related to injector supply
Visually inspect injector harness, connectors and pins for corrosion, damage, or disconnection
Back-probe the injector supply pin(s) for group B with ignition ON and during cranking to confirm presence/absence of supply voltage
Perform resistance check of individual injectors to identify open coils

Signal parameters

Expected injector supply voltage: ~battery voltage (approx. 12 V) at the injector supply rail with IGN ON/cranking
Injector driver type: usually low-side switching by the ECM (injector supply common to battery, ECM grounds injectors)
Injector coil resistance: varies by design (typical ranges from a few ohms to ~10–16 ohms); consult vehicle-specific spec
Injector pulse: square-wave pulses from ECM; pulse width varies with engine load and RPM

Diagnostic algorithm

Safety: ensure vehicle is secure, key OFF before disconnecting connectors. Use proper PPE.
Use a scan tool: confirm P2149, view live data, and note which cylinders/injectors are grouped as 'B'. Clear the code and attempt to reproduce to confirm persistence.
Check charging system: verify battery voltage and main ground integrity.
Inspect fuses/relays: locate injector power fuse(s) and fuel/injector relay for group B; verify continuity and operation. Replace suspect items and retest.
Verify supply voltage at injector harness: back-probe the common supply pin(s) for group B with IGN ON and while cranking. If no battery voltage, trace upstream to fuse/relay and battery.
Check continuity: with negative battery disconnected, measure continuity from the injector supply pin(s) back to the fuse/relay and ECM connector to locate open circuits.
Inspect connectors/wiring: remove and inspect the harness connectors at the injector bank and ECM for bent pins, corrosion, or damage; repair or replace as needed.
Test individual injectors: measure coil resistance and check for open/short. If uncertain, bench-test or substitute a known-good injector to confirm behavior.
Check ECM driver: if wiring, fuses, relays and injectors are good and supply is present but ECM does not switch or shows internal open, consider ECM fault. Confirm with factory diagnostic procedures before ECM replacement.
After repair: clear codes, perform engine run/drive cycle and re-scan to ensure the fault does not return.

Likely causes

Blown main injector fuse or ECM power fuse
Failed fuel injector power/primary relay for group B
Disconnected or corroded group B connector at the engine harness
Broken/abraded wire in harness near cylinder head or firewall
Faulty ECM output for injector supply (last-resort)

Fault status

⚠️ Status

P2149 - Injector Group B Supply Voltage/Open Circuit. Loss of injector group B supply detected. Check fuses, relay, harness, connectors and ECM.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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P2149 — injector group B supply voltage - open circuit